diff mbox series

[04/10] dt-bindings: treewide: add feature-domains description in binding files

Message ID 20230705172759.1610753-5-gatien.chevallier@foss.st.com
State Superseded
Headers show
Series Introduce STM32 Firewall framework | expand

Commit Message

Gatien CHEVALLIER July 5, 2023, 5:27 p.m. UTC
feature-domains is an optional property that allows a peripheral to
refer to one or more feature domain controller(s).

Description of this property is added to all peripheral binding files of
the peripheral under the STM32 firewall controllers. It allows an accurate
representation of the hardware, where various peripherals are connected
to this firewall bus. The firewall can then check the peripheral accesses
before allowing it to probe.

Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
---

Disclaimer: Some error with dtbs_check will be observed as I've
considered the property to be generic, as Rob asked

 Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml  | 4 ++++
 Documentation/devicetree/bindings/dma/st,stm32-dma.yaml      | 4 ++++
 Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml   | 4 ++++
 Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml      | 4 ++++
 Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml  | 4 ++++
 .../devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml      | 4 ++++
 Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml  | 4 ++++
 .../devicetree/bindings/media/cec/st,stm32-cec.yaml          | 4 ++++
 Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml   | 4 ++++
 .../bindings/memory-controllers/st,stm32-fmc2-ebi.yaml       | 4 ++++
 Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml  | 4 ++++
 Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml   | 5 +++++
 Documentation/devicetree/bindings/mmc/arm,pl18x.yaml         | 4 ++++
 Documentation/devicetree/bindings/net/stm32-dwmac.yaml       | 4 ++++
 Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml | 4 ++++
 .../devicetree/bindings/regulator/st,stm32-vrefbuf.yaml      | 4 ++++
 Documentation/devicetree/bindings/rng/st,stm32-rng.yaml      | 4 ++++
 Documentation/devicetree/bindings/serial/st,stm32-uart.yaml  | 4 ++++
 Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml    | 4 ++++
 Documentation/devicetree/bindings/sound/st,stm32-sai.yaml    | 4 ++++
 .../devicetree/bindings/sound/st,stm32-spdifrx.yaml          | 4 ++++
 Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml     | 4 ++++
 Documentation/devicetree/bindings/spi/st,stm32-spi.yaml      | 4 ++++
 Documentation/devicetree/bindings/usb/dwc2.yaml              | 4 ++++
 24 files changed, 97 insertions(+)

Comments

Rob Herring (Arm) July 6, 2023, 2:51 p.m. UTC | #1
On Wed, Jul 05, 2023 at 07:27:53PM +0200, Gatien Chevallier wrote:
> feature-domains is an optional property that allows a peripheral to
> refer to one or more feature domain controller(s).
> 
> Description of this property is added to all peripheral binding files of
> the peripheral under the STM32 firewall controllers. It allows an accurate
> representation of the hardware, where various peripherals are connected
> to this firewall bus. The firewall can then check the peripheral accesses
> before allowing it to probe.
> 
> Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
> ---
> 
> Disclaimer: Some error with dtbs_check will be observed as I've
> considered the property to be generic, as Rob asked
> 
>  Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml  | 4 ++++
>  Documentation/devicetree/bindings/dma/st,stm32-dma.yaml      | 4 ++++
>  Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml   | 4 ++++
>  Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml      | 4 ++++
>  Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml  | 4 ++++
>  .../devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml      | 4 ++++
>  Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml  | 4 ++++
>  .../devicetree/bindings/media/cec/st,stm32-cec.yaml          | 4 ++++
>  Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml   | 4 ++++
>  .../bindings/memory-controllers/st,stm32-fmc2-ebi.yaml       | 4 ++++
>  Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml  | 4 ++++
>  Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml   | 5 +++++
>  Documentation/devicetree/bindings/mmc/arm,pl18x.yaml         | 4 ++++
>  Documentation/devicetree/bindings/net/stm32-dwmac.yaml       | 4 ++++
>  Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml | 4 ++++
>  .../devicetree/bindings/regulator/st,stm32-vrefbuf.yaml      | 4 ++++
>  Documentation/devicetree/bindings/rng/st,stm32-rng.yaml      | 4 ++++
>  Documentation/devicetree/bindings/serial/st,stm32-uart.yaml  | 4 ++++
>  Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml    | 4 ++++
>  Documentation/devicetree/bindings/sound/st,stm32-sai.yaml    | 4 ++++
>  .../devicetree/bindings/sound/st,stm32-spdifrx.yaml          | 4 ++++
>  Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml     | 4 ++++
>  Documentation/devicetree/bindings/spi/st,stm32-spi.yaml      | 4 ++++
>  Documentation/devicetree/bindings/usb/dwc2.yaml              | 4 ++++
>  24 files changed, 97 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
> index b767ec72a999..daf8dcaef627 100644
> --- a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
> +++ b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
> @@ -50,6 +50,10 @@ properties:
>    power-domains:
>      maxItems: 1
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3

What are the 3 entries?

Rob
Gatien CHEVALLIER July 7, 2023, 12:28 p.m. UTC | #2
Hello Rob,

On 7/6/23 16:51, Rob Herring wrote:
> On Wed, Jul 05, 2023 at 07:27:53PM +0200, Gatien Chevallier wrote:
>> feature-domains is an optional property that allows a peripheral to
>> refer to one or more feature domain controller(s).
>>
>> Description of this property is added to all peripheral binding files of
>> the peripheral under the STM32 firewall controllers. It allows an accurate
>> representation of the hardware, where various peripherals are connected
>> to this firewall bus. The firewall can then check the peripheral accesses
>> before allowing it to probe.
>>
>> Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
>> ---
>>
>> Disclaimer: Some error with dtbs_check will be observed as I've
>> considered the property to be generic, as Rob asked
>>
>>   Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml  | 4 ++++
>>   Documentation/devicetree/bindings/dma/st,stm32-dma.yaml      | 4 ++++
>>   Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml   | 4 ++++
>>   Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml      | 4 ++++
>>   Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml  | 4 ++++
>>   .../devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml      | 4 ++++
>>   Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml  | 4 ++++
>>   .../devicetree/bindings/media/cec/st,stm32-cec.yaml          | 4 ++++
>>   Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml   | 4 ++++
>>   .../bindings/memory-controllers/st,stm32-fmc2-ebi.yaml       | 4 ++++
>>   Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml  | 4 ++++
>>   Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml   | 5 +++++
>>   Documentation/devicetree/bindings/mmc/arm,pl18x.yaml         | 4 ++++
>>   Documentation/devicetree/bindings/net/stm32-dwmac.yaml       | 4 ++++
>>   Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml | 4 ++++
>>   .../devicetree/bindings/regulator/st,stm32-vrefbuf.yaml      | 4 ++++
>>   Documentation/devicetree/bindings/rng/st,stm32-rng.yaml      | 4 ++++
>>   Documentation/devicetree/bindings/serial/st,stm32-uart.yaml  | 4 ++++
>>   Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml    | 4 ++++
>>   Documentation/devicetree/bindings/sound/st,stm32-sai.yaml    | 4 ++++
>>   .../devicetree/bindings/sound/st,stm32-spdifrx.yaml          | 4 ++++
>>   Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml     | 4 ++++
>>   Documentation/devicetree/bindings/spi/st,stm32-spi.yaml      | 4 ++++
>>   Documentation/devicetree/bindings/usb/dwc2.yaml              | 4 ++++
>>   24 files changed, 97 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
>> index b767ec72a999..daf8dcaef627 100644
>> --- a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
>> +++ b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
>> @@ -50,6 +50,10 @@ properties:
>>     power-domains:
>>       maxItems: 1
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
> 
> What are the 3 entries?
> 
> Rob

I thought I was benefiting from the description of the pattern-property 
in the RIFSC YAML file. But yes anyway, it seems like it needs some 
description here as the dependency does not appear in this file.

I picked 3 as a maxItems for our ST needs, I'll give it some more 
thought when coming back with something clearer.

I will change that in V2, thank you for pointing that out.

Best regards,
Gatien
Oleksii Moisieiev July 7, 2023, 2:07 p.m. UTC | #3
Gatien Chevallier <gatien.chevallier@foss.st.com> writes:

> feature-domains is an optional property that allows a peripheral to
> refer to one or more feature domain controller(s).
>
> Description of this property is added to all peripheral binding files of
> the peripheral under the STM32 firewall controllers. It allows an accurate
> representation of the hardware, where various peripherals are connected
> to this firewall bus. The firewall can then check the peripheral accesses
> before allowing it to probe.
>
> Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
> ---
>
> Disclaimer: Some error with dtbs_check will be observed as I've
> considered the property to be generic, as Rob asked
>
>  Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml  | 4 ++++
>  Documentation/devicetree/bindings/dma/st,stm32-dma.yaml      | 4 ++++
>  Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml   | 4 ++++
>  Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml      | 4 ++++
>  Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml  | 4 ++++
>  .../devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml      | 4 ++++
>  Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml  | 4 ++++
>  .../devicetree/bindings/media/cec/st,stm32-cec.yaml          | 4 ++++
>  Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml   | 4 ++++
>  .../bindings/memory-controllers/st,stm32-fmc2-ebi.yaml       | 4 ++++
>  Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml  | 4 ++++
>  Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml   | 5 +++++
>  Documentation/devicetree/bindings/mmc/arm,pl18x.yaml         | 4 ++++
>  Documentation/devicetree/bindings/net/stm32-dwmac.yaml       | 4 ++++
>  Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml | 4 ++++
>  .../devicetree/bindings/regulator/st,stm32-vrefbuf.yaml      | 4 ++++
>  Documentation/devicetree/bindings/rng/st,stm32-rng.yaml      | 4 ++++
>  Documentation/devicetree/bindings/serial/st,stm32-uart.yaml  | 4 ++++
>  Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml    | 4 ++++
>  Documentation/devicetree/bindings/sound/st,stm32-sai.yaml    | 4 ++++
>  .../devicetree/bindings/sound/st,stm32-spdifrx.yaml          | 4 ++++
>  Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml     | 4 ++++
>  Documentation/devicetree/bindings/spi/st,stm32-spi.yaml      | 4 ++++
>  Documentation/devicetree/bindings/usb/dwc2.yaml              | 4 ++++
>  24 files changed, 97 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
> index b767ec72a999..daf8dcaef627 100644
> --- a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
> +++ b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
> @@ -50,6 +50,10 @@ properties:
>    power-domains:
>      maxItems: 1
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +

I beliewe feature-domains is generic binding. This means that maxItems
can be implementation dependend. I would rather drop maxItems so the
following format will be possible:

          feature-domains = <&etzpc 1>, <&etzpc 2>, <&some_other_domain 1 2 3 4>
          feature-domain-names = "firewall 1", "firewall 2", "other_domain"

Also I beliewe driver will handle feature-domain-names property so it
will parse feature-domains only related to the firewall.

>  required:
>    - compatible
>    - reg
> diff --git a/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml b/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
> index 329847ef096a..2236ac95574b 100644
> --- a/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
> +++ b/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
> @@ -82,6 +82,10 @@ properties:
>      description: if defined, it indicates that the controller
>        supports memory-to-memory transfer
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>  required:
>    - compatible
>    - reg
> diff --git a/Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml b/Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml
> index e722fbcd8a5f..47ae890f5bd9 100644
> --- a/Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml
> +++ b/Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml
> @@ -28,6 +28,10 @@ properties:
>    resets:
>      maxItems: 1
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>  required:
>    - compatible
>    - reg
> diff --git a/Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml b/Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml
> index 94b75d9f66cd..326a96741f50 100644
> --- a/Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml
> +++ b/Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml
> @@ -99,6 +99,10 @@ properties:
>  
>    wakeup-source: true
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>  required:
>    - compatible
>    - reg
> diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml
> index 995cbf8cefc6..3eb20d67f0fc 100644
> --- a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml
> @@ -93,6 +93,10 @@ properties:
>    '#size-cells':
>      const: 0
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>  allOf:
>    - if:
>        properties:
> diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
> index 1970503389aa..bc34ae172417 100644
> --- a/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
> @@ -59,6 +59,10 @@ properties:
>        If not, SPI CLKOUT frequency will not be accurate.
>      maximum: 20000000
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>  required:
>    - compatible
>    - reg
> diff --git a/Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml b/Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml
> index 04045b932bd2..90d35a2a6504 100644
> --- a/Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml
> +++ b/Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml
> @@ -45,6 +45,10 @@ properties:
>    '#size-cells':
>      const: 0
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>  additionalProperties: false
>  
>  required:
> diff --git a/Documentation/devicetree/bindings/media/cec/st,stm32-cec.yaml b/Documentation/devicetree/bindings/media/cec/st,stm32-cec.yaml
> index 2314a9a14650..f88e3c0e6175 100644
> --- a/Documentation/devicetree/bindings/media/cec/st,stm32-cec.yaml
> +++ b/Documentation/devicetree/bindings/media/cec/st,stm32-cec.yaml
> @@ -29,6 +29,10 @@ properties:
>        - const: cec
>        - const: hdmi-cec
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>  required:
>    - compatible
>    - reg
> diff --git a/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml b/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml
> index 6b3e413cedb2..4fa1d14910df 100644
> --- a/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml
> +++ b/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml
> @@ -36,6 +36,10 @@ properties:
>    resets:
>      maxItems: 1
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>    port:
>      $ref: /schemas/graph.yaml#/$defs/port-base
>      unevaluatedProperties: false
> diff --git a/Documentation/devicetree/bindings/memory-controllers/st,stm32-fmc2-ebi.yaml b/Documentation/devicetree/bindings/memory-controllers/st,stm32-fmc2-ebi.yaml
> index 14f1833d37c9..63b3d012147b 100644
> --- a/Documentation/devicetree/bindings/memory-controllers/st,stm32-fmc2-ebi.yaml
> +++ b/Documentation/devicetree/bindings/memory-controllers/st,stm32-fmc2-ebi.yaml
> @@ -45,6 +45,10 @@ properties:
>        Reflects the memory layout with four integer values per bank. Format:
>        <bank-number> 0 <address of the bank> <size>
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>  patternProperties:
>    "^.*@[0-4],[a-f0-9]+$":
>      additionalProperties: true
> diff --git a/Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml b/Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml
> index 27329c5dc38e..59d770544950 100644
> --- a/Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml
> +++ b/Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml
> @@ -44,6 +44,10 @@ properties:
>  
>    wakeup-source: true
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>    pwm:
>      type: object
>      additionalProperties: false
> diff --git a/Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml b/Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml
> index f84e09a5743b..d5ad097e94ec 100644
> --- a/Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml
> +++ b/Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml
> @@ -67,6 +67,11 @@ properties:
>    "#size-cells":
>      const: 0
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
> +
>    pwm:
>      type: object
>      additionalProperties: false
> diff --git a/Documentation/devicetree/bindings/mmc/arm,pl18x.yaml b/Documentation/devicetree/bindings/mmc/arm,pl18x.yaml
> index 2459a55ed540..6ebedee65153 100644
> --- a/Documentation/devicetree/bindings/mmc/arm,pl18x.yaml
> +++ b/Documentation/devicetree/bindings/mmc/arm,pl18x.yaml
> @@ -79,6 +79,10 @@ properties:
>            - const: rx
>            - const: tx
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>    power-domains: true
>  
>    resets:
> diff --git a/Documentation/devicetree/bindings/net/stm32-dwmac.yaml b/Documentation/devicetree/bindings/net/stm32-dwmac.yaml
> index fc8c96b08d7d..0e408dc85c13 100644
> --- a/Documentation/devicetree/bindings/net/stm32-dwmac.yaml
> +++ b/Documentation/devicetree/bindings/net/stm32-dwmac.yaml
> @@ -93,6 +93,10 @@ properties:
>        select RCC clock instead of ETH_REF_CLK.
>      type: boolean
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>  required:
>    - compatible
>    - clocks
> diff --git a/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml b/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml
> index 24a3dbde223b..b9ac20c8bf05 100644
> --- a/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml
> +++ b/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml
> @@ -55,6 +55,10 @@ properties:
>      description: number of clock cells for ck_usbo_48m consumer
>      const: 0
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>  # Required child nodes:
>  
>  patternProperties:
> diff --git a/Documentation/devicetree/bindings/regulator/st,stm32-vrefbuf.yaml b/Documentation/devicetree/bindings/regulator/st,stm32-vrefbuf.yaml
> index 05f4ad2c7d3a..02cefe4ef42b 100644
> --- a/Documentation/devicetree/bindings/regulator/st,stm32-vrefbuf.yaml
> +++ b/Documentation/devicetree/bindings/regulator/st,stm32-vrefbuf.yaml
> @@ -30,6 +30,10 @@ properties:
>    vdda-supply:
>      description: phandle to the vdda input analog voltage.
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>  required:
>    - compatible
>    - reg
> diff --git a/Documentation/devicetree/bindings/rng/st,stm32-rng.yaml b/Documentation/devicetree/bindings/rng/st,stm32-rng.yaml
> index 187b172d0cca..79eb5f5bd252 100644
> --- a/Documentation/devicetree/bindings/rng/st,stm32-rng.yaml
> +++ b/Documentation/devicetree/bindings/rng/st,stm32-rng.yaml
> @@ -30,6 +30,10 @@ properties:
>      type: boolean
>      description: If set enable the clock detection management
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>  required:
>    - compatible
>    - reg
> diff --git a/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml b/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
> index 1df8ffe95fc6..893978e7170f 100644
> --- a/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
> +++ b/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
> @@ -70,6 +70,10 @@ properties:
>      enum: [1, 2, 4, 8, 12, 14, 16]
>      default: 8
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>  allOf:
>    - $ref: rs485.yaml#
>    - $ref: serial.yaml#
> diff --git a/Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml b/Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml
> index b9111d375b93..64c5898e51f8 100644
> --- a/Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml
> +++ b/Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml
> @@ -65,6 +65,10 @@ properties:
>      $ref: audio-graph-port.yaml#
>      unevaluatedProperties: false
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>  required:
>    - compatible
>    - "#sound-dai-cells"
> diff --git a/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml b/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml
> index 56d206f97a96..9bc08b7645dc 100644
> --- a/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml
> +++ b/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml
> @@ -48,6 +48,10 @@ properties:
>    clock-names:
>      maxItems: 3
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>  required:
>    - compatible
>    - reg
> diff --git a/Documentation/devicetree/bindings/sound/st,stm32-spdifrx.yaml b/Documentation/devicetree/bindings/sound/st,stm32-spdifrx.yaml
> index bc48151b9adb..f00e5db9ee3b 100644
> --- a/Documentation/devicetree/bindings/sound/st,stm32-spdifrx.yaml
> +++ b/Documentation/devicetree/bindings/sound/st,stm32-spdifrx.yaml
> @@ -50,6 +50,10 @@ properties:
>    resets:
>      maxItems: 1
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>  required:
>    - compatible
>    - "#sound-dai-cells"
> diff --git a/Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml b/Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml
> index 8bba965a9ae6..2ac136802467 100644
> --- a/Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml
> +++ b/Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml
> @@ -46,6 +46,10 @@ properties:
>        - const: tx
>        - const: rx
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>  required:
>    - compatible
>    - reg
> diff --git a/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml b/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
> index 9ca1a843c820..725c26daabe4 100644
> --- a/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
> +++ b/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
> @@ -59,6 +59,10 @@ properties:
>        - const: rx
>        - const: tx
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>  patternProperties:
>    "^[a-zA-Z][a-zA-Z0-9,+\\-._]{0,63}@[0-9a-f]+$":
>      type: object
> diff --git a/Documentation/devicetree/bindings/usb/dwc2.yaml b/Documentation/devicetree/bindings/usb/dwc2.yaml
> index d3506090f8b1..c372caf154fc 100644
> --- a/Documentation/devicetree/bindings/usb/dwc2.yaml
> +++ b/Documentation/devicetree/bindings/usb/dwc2.yaml
> @@ -171,6 +171,10 @@ properties:
>  
>    tpl-support: true
>  
> +  feature-domains:
> +    minItems: 1
> +    maxItems: 3
> +
>  dependencies:
>    port: [ usb-role-switch ]
>    role-switch-default-mode: [ usb-role-switch ]
Rob Herring (Arm) July 7, 2023, 3:20 p.m. UTC | #4
On Fri, Jul 07, 2023 at 02:28:28PM +0200, Gatien CHEVALLIER wrote:
> Hello Rob,
> 
> On 7/6/23 16:51, Rob Herring wrote:
> > On Wed, Jul 05, 2023 at 07:27:53PM +0200, Gatien Chevallier wrote:
> > > feature-domains is an optional property that allows a peripheral to
> > > refer to one or more feature domain controller(s).
> > > 
> > > Description of this property is added to all peripheral binding files of
> > > the peripheral under the STM32 firewall controllers. It allows an accurate
> > > representation of the hardware, where various peripherals are connected
> > > to this firewall bus. The firewall can then check the peripheral accesses
> > > before allowing it to probe.
> > > 
> > > Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
> > > ---
> > > 
> > > Disclaimer: Some error with dtbs_check will be observed as I've
> > > considered the property to be generic, as Rob asked
> > > 
> > >   Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml  | 4 ++++
> > >   Documentation/devicetree/bindings/dma/st,stm32-dma.yaml      | 4 ++++
> > >   Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml   | 4 ++++
> > >   Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml      | 4 ++++
> > >   Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml  | 4 ++++
> > >   .../devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml      | 4 ++++
> > >   Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml  | 4 ++++
> > >   .../devicetree/bindings/media/cec/st,stm32-cec.yaml          | 4 ++++
> > >   Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml   | 4 ++++
> > >   .../bindings/memory-controllers/st,stm32-fmc2-ebi.yaml       | 4 ++++
> > >   Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml  | 4 ++++
> > >   Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml   | 5 +++++
> > >   Documentation/devicetree/bindings/mmc/arm,pl18x.yaml         | 4 ++++
> > >   Documentation/devicetree/bindings/net/stm32-dwmac.yaml       | 4 ++++
> > >   Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml | 4 ++++
> > >   .../devicetree/bindings/regulator/st,stm32-vrefbuf.yaml      | 4 ++++
> > >   Documentation/devicetree/bindings/rng/st,stm32-rng.yaml      | 4 ++++
> > >   Documentation/devicetree/bindings/serial/st,stm32-uart.yaml  | 4 ++++
> > >   Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml    | 4 ++++
> > >   Documentation/devicetree/bindings/sound/st,stm32-sai.yaml    | 4 ++++
> > >   .../devicetree/bindings/sound/st,stm32-spdifrx.yaml          | 4 ++++
> > >   Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml     | 4 ++++
> > >   Documentation/devicetree/bindings/spi/st,stm32-spi.yaml      | 4 ++++
> > >   Documentation/devicetree/bindings/usb/dwc2.yaml              | 4 ++++
> > >   24 files changed, 97 insertions(+)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
> > > index b767ec72a999..daf8dcaef627 100644
> > > --- a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
> > > +++ b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
> > > @@ -50,6 +50,10 @@ properties:
> > >     power-domains:
> > >       maxItems: 1
> > > +  feature-domains:
> > > +    minItems: 1
> > > +    maxItems: 3
> > 
> > What are the 3 entries?
> > 
> > Rob
> 
> I thought I was benefiting from the description of the pattern-property in
> the RIFSC YAML file. But yes anyway, it seems like it needs some description
> here as the dependency does not appear in this file.

Humm, that should limit the maximum entries to 2, so 3 would never work 
(if RIFSC is the parent). 

> I picked 3 as a maxItems for our ST needs, I'll give it some more thought
> when coming back with something clearer.

I'd expect you have 1 entry for register bus and 1 entry for DMA bus if 
there is one. It's block specific for how many entries, so the RIFSC 
schema should not be setting that. You could possibly say that 
'feature-domains' is required for all the child nodes though.

Rob
Gatien CHEVALLIER July 7, 2023, 3:26 p.m. UTC | #5
On 7/7/23 16:07, Oleksii Moisieiev wrote:
> 
> Gatien Chevallier <gatien.chevallier@foss.st.com> writes:
> 
>> feature-domains is an optional property that allows a peripheral to
>> refer to one or more feature domain controller(s).
>>
>> Description of this property is added to all peripheral binding files of
>> the peripheral under the STM32 firewall controllers. It allows an accurate
>> representation of the hardware, where various peripherals are connected
>> to this firewall bus. The firewall can then check the peripheral accesses
>> before allowing it to probe.
>>
>> Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
>> ---
>>
>> Disclaimer: Some error with dtbs_check will be observed as I've
>> considered the property to be generic, as Rob asked
>>
>>   Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml  | 4 ++++
>>   Documentation/devicetree/bindings/dma/st,stm32-dma.yaml      | 4 ++++
>>   Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml   | 4 ++++
>>   Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml      | 4 ++++
>>   Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml  | 4 ++++
>>   .../devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml      | 4 ++++
>>   Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml  | 4 ++++
>>   .../devicetree/bindings/media/cec/st,stm32-cec.yaml          | 4 ++++
>>   Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml   | 4 ++++
>>   .../bindings/memory-controllers/st,stm32-fmc2-ebi.yaml       | 4 ++++
>>   Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml  | 4 ++++
>>   Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml   | 5 +++++
>>   Documentation/devicetree/bindings/mmc/arm,pl18x.yaml         | 4 ++++
>>   Documentation/devicetree/bindings/net/stm32-dwmac.yaml       | 4 ++++
>>   Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml | 4 ++++
>>   .../devicetree/bindings/regulator/st,stm32-vrefbuf.yaml      | 4 ++++
>>   Documentation/devicetree/bindings/rng/st,stm32-rng.yaml      | 4 ++++
>>   Documentation/devicetree/bindings/serial/st,stm32-uart.yaml  | 4 ++++
>>   Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml    | 4 ++++
>>   Documentation/devicetree/bindings/sound/st,stm32-sai.yaml    | 4 ++++
>>   .../devicetree/bindings/sound/st,stm32-spdifrx.yaml          | 4 ++++
>>   Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml     | 4 ++++
>>   Documentation/devicetree/bindings/spi/st,stm32-spi.yaml      | 4 ++++
>>   Documentation/devicetree/bindings/usb/dwc2.yaml              | 4 ++++
>>   24 files changed, 97 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
>> index b767ec72a999..daf8dcaef627 100644
>> --- a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
>> +++ b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
>> @@ -50,6 +50,10 @@ properties:
>>     power-domains:
>>       maxItems: 1
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
> 
> I beliewe feature-domains is generic binding. This means that maxItems
> can be implementation dependend. I would rather drop maxItems so the
> following format will be possible:
> 
>            feature-domains = <&etzpc 1>, <&etzpc 2>, <&some_other_domain 1 2 3 4>
>            feature-domain-names = "firewall 1", "firewall 2", "other_domain"
> 

I'd prefer to drop the maxItems as well. I've been told at one point in
the first series to choose a number for this maybe picking a high but
reasonnable number is preferrable.

Based on How to Get Your DT Schema Bindings Accepted in Less than 10 
Iterations pdf published by Krzysztof, I see that examples use
minItems/maxItems. But I can't find if it's mandatory


> Also I beliewe driver will handle feature-domain-names property so it
> will parse feature-domains only related to the firewall.
> 

Yep, in case of multiple feature-domains, it could be nice.

>>   required:
>>     - compatible
>>     - reg
>> diff --git a/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml b/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
>> index 329847ef096a..2236ac95574b 100644
>> --- a/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
>> +++ b/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
>> @@ -82,6 +82,10 @@ properties:
>>       description: if defined, it indicates that the controller
>>         supports memory-to-memory transfer
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>   required:
>>     - compatible
>>     - reg
>> diff --git a/Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml b/Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml
>> index e722fbcd8a5f..47ae890f5bd9 100644
>> --- a/Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml
>> +++ b/Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml
>> @@ -28,6 +28,10 @@ properties:
>>     resets:
>>       maxItems: 1
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>   required:
>>     - compatible
>>     - reg
>> diff --git a/Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml b/Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml
>> index 94b75d9f66cd..326a96741f50 100644
>> --- a/Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml
>> +++ b/Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml
>> @@ -99,6 +99,10 @@ properties:
>>   
>>     wakeup-source: true
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>   required:
>>     - compatible
>>     - reg
>> diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml
>> index 995cbf8cefc6..3eb20d67f0fc 100644
>> --- a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml
>> +++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml
>> @@ -93,6 +93,10 @@ properties:
>>     '#size-cells':
>>       const: 0
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>   allOf:
>>     - if:
>>         properties:
>> diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
>> index 1970503389aa..bc34ae172417 100644
>> --- a/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
>> +++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
>> @@ -59,6 +59,10 @@ properties:
>>         If not, SPI CLKOUT frequency will not be accurate.
>>       maximum: 20000000
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>   required:
>>     - compatible
>>     - reg
>> diff --git a/Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml b/Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml
>> index 04045b932bd2..90d35a2a6504 100644
>> --- a/Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml
>> +++ b/Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml
>> @@ -45,6 +45,10 @@ properties:
>>     '#size-cells':
>>       const: 0
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>   additionalProperties: false
>>   
>>   required:
>> diff --git a/Documentation/devicetree/bindings/media/cec/st,stm32-cec.yaml b/Documentation/devicetree/bindings/media/cec/st,stm32-cec.yaml
>> index 2314a9a14650..f88e3c0e6175 100644
>> --- a/Documentation/devicetree/bindings/media/cec/st,stm32-cec.yaml
>> +++ b/Documentation/devicetree/bindings/media/cec/st,stm32-cec.yaml
>> @@ -29,6 +29,10 @@ properties:
>>         - const: cec
>>         - const: hdmi-cec
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>   required:
>>     - compatible
>>     - reg
>> diff --git a/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml b/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml
>> index 6b3e413cedb2..4fa1d14910df 100644
>> --- a/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml
>> +++ b/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml
>> @@ -36,6 +36,10 @@ properties:
>>     resets:
>>       maxItems: 1
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>     port:
>>       $ref: /schemas/graph.yaml#/$defs/port-base
>>       unevaluatedProperties: false
>> diff --git a/Documentation/devicetree/bindings/memory-controllers/st,stm32-fmc2-ebi.yaml b/Documentation/devicetree/bindings/memory-controllers/st,stm32-fmc2-ebi.yaml
>> index 14f1833d37c9..63b3d012147b 100644
>> --- a/Documentation/devicetree/bindings/memory-controllers/st,stm32-fmc2-ebi.yaml
>> +++ b/Documentation/devicetree/bindings/memory-controllers/st,stm32-fmc2-ebi.yaml
>> @@ -45,6 +45,10 @@ properties:
>>         Reflects the memory layout with four integer values per bank. Format:
>>         <bank-number> 0 <address of the bank> <size>
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>   patternProperties:
>>     "^.*@[0-4],[a-f0-9]+$":
>>       additionalProperties: true
>> diff --git a/Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml b/Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml
>> index 27329c5dc38e..59d770544950 100644
>> --- a/Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml
>> +++ b/Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml
>> @@ -44,6 +44,10 @@ properties:
>>   
>>     wakeup-source: true
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>     pwm:
>>       type: object
>>       additionalProperties: false
>> diff --git a/Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml b/Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml
>> index f84e09a5743b..d5ad097e94ec 100644
>> --- a/Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml
>> +++ b/Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml
>> @@ -67,6 +67,11 @@ properties:
>>     "#size-cells":
>>       const: 0
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>> +
>>     pwm:
>>       type: object
>>       additionalProperties: false
>> diff --git a/Documentation/devicetree/bindings/mmc/arm,pl18x.yaml b/Documentation/devicetree/bindings/mmc/arm,pl18x.yaml
>> index 2459a55ed540..6ebedee65153 100644
>> --- a/Documentation/devicetree/bindings/mmc/arm,pl18x.yaml
>> +++ b/Documentation/devicetree/bindings/mmc/arm,pl18x.yaml
>> @@ -79,6 +79,10 @@ properties:
>>             - const: rx
>>             - const: tx
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>     power-domains: true
>>   
>>     resets:
>> diff --git a/Documentation/devicetree/bindings/net/stm32-dwmac.yaml b/Documentation/devicetree/bindings/net/stm32-dwmac.yaml
>> index fc8c96b08d7d..0e408dc85c13 100644
>> --- a/Documentation/devicetree/bindings/net/stm32-dwmac.yaml
>> +++ b/Documentation/devicetree/bindings/net/stm32-dwmac.yaml
>> @@ -93,6 +93,10 @@ properties:
>>         select RCC clock instead of ETH_REF_CLK.
>>       type: boolean
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>   required:
>>     - compatible
>>     - clocks
>> diff --git a/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml b/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml
>> index 24a3dbde223b..b9ac20c8bf05 100644
>> --- a/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml
>> +++ b/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml
>> @@ -55,6 +55,10 @@ properties:
>>       description: number of clock cells for ck_usbo_48m consumer
>>       const: 0
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>   # Required child nodes:
>>   
>>   patternProperties:
>> diff --git a/Documentation/devicetree/bindings/regulator/st,stm32-vrefbuf.yaml b/Documentation/devicetree/bindings/regulator/st,stm32-vrefbuf.yaml
>> index 05f4ad2c7d3a..02cefe4ef42b 100644
>> --- a/Documentation/devicetree/bindings/regulator/st,stm32-vrefbuf.yaml
>> +++ b/Documentation/devicetree/bindings/regulator/st,stm32-vrefbuf.yaml
>> @@ -30,6 +30,10 @@ properties:
>>     vdda-supply:
>>       description: phandle to the vdda input analog voltage.
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>   required:
>>     - compatible
>>     - reg
>> diff --git a/Documentation/devicetree/bindings/rng/st,stm32-rng.yaml b/Documentation/devicetree/bindings/rng/st,stm32-rng.yaml
>> index 187b172d0cca..79eb5f5bd252 100644
>> --- a/Documentation/devicetree/bindings/rng/st,stm32-rng.yaml
>> +++ b/Documentation/devicetree/bindings/rng/st,stm32-rng.yaml
>> @@ -30,6 +30,10 @@ properties:
>>       type: boolean
>>       description: If set enable the clock detection management
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>   required:
>>     - compatible
>>     - reg
>> diff --git a/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml b/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
>> index 1df8ffe95fc6..893978e7170f 100644
>> --- a/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
>> +++ b/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
>> @@ -70,6 +70,10 @@ properties:
>>       enum: [1, 2, 4, 8, 12, 14, 16]
>>       default: 8
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>   allOf:
>>     - $ref: rs485.yaml#
>>     - $ref: serial.yaml#
>> diff --git a/Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml b/Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml
>> index b9111d375b93..64c5898e51f8 100644
>> --- a/Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml
>> +++ b/Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml
>> @@ -65,6 +65,10 @@ properties:
>>       $ref: audio-graph-port.yaml#
>>       unevaluatedProperties: false
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>   required:
>>     - compatible
>>     - "#sound-dai-cells"
>> diff --git a/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml b/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml
>> index 56d206f97a96..9bc08b7645dc 100644
>> --- a/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml
>> +++ b/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml
>> @@ -48,6 +48,10 @@ properties:
>>     clock-names:
>>       maxItems: 3
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>   required:
>>     - compatible
>>     - reg
>> diff --git a/Documentation/devicetree/bindings/sound/st,stm32-spdifrx.yaml b/Documentation/devicetree/bindings/sound/st,stm32-spdifrx.yaml
>> index bc48151b9adb..f00e5db9ee3b 100644
>> --- a/Documentation/devicetree/bindings/sound/st,stm32-spdifrx.yaml
>> +++ b/Documentation/devicetree/bindings/sound/st,stm32-spdifrx.yaml
>> @@ -50,6 +50,10 @@ properties:
>>     resets:
>>       maxItems: 1
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>   required:
>>     - compatible
>>     - "#sound-dai-cells"
>> diff --git a/Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml b/Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml
>> index 8bba965a9ae6..2ac136802467 100644
>> --- a/Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml
>> +++ b/Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml
>> @@ -46,6 +46,10 @@ properties:
>>         - const: tx
>>         - const: rx
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>   required:
>>     - compatible
>>     - reg
>> diff --git a/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml b/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
>> index 9ca1a843c820..725c26daabe4 100644
>> --- a/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
>> +++ b/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
>> @@ -59,6 +59,10 @@ properties:
>>         - const: rx
>>         - const: tx
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>   patternProperties:
>>     "^[a-zA-Z][a-zA-Z0-9,+\\-._]{0,63}@[0-9a-f]+$":
>>       type: object
>> diff --git a/Documentation/devicetree/bindings/usb/dwc2.yaml b/Documentation/devicetree/bindings/usb/dwc2.yaml
>> index d3506090f8b1..c372caf154fc 100644
>> --- a/Documentation/devicetree/bindings/usb/dwc2.yaml
>> +++ b/Documentation/devicetree/bindings/usb/dwc2.yaml
>> @@ -171,6 +171,10 @@ properties:
>>   
>>     tpl-support: true
>>   
>> +  feature-domains:
>> +    minItems: 1
>> +    maxItems: 3
>> +
>>   dependencies:
>>     port: [ usb-role-switch ]
>>     role-switch-default-mode: [ usb-role-switch ]
> 
>
Rob Herring (Arm) July 7, 2023, 3:27 p.m. UTC | #6
On Fri, Jul 07, 2023 at 02:07:18PM +0000, Oleksii Moisieiev wrote:
> 
> Gatien Chevallier <gatien.chevallier@foss.st.com> writes:
> 
> > feature-domains is an optional property that allows a peripheral to
> > refer to one or more feature domain controller(s).
> >
> > Description of this property is added to all peripheral binding files of
> > the peripheral under the STM32 firewall controllers. It allows an accurate
> > representation of the hardware, where various peripherals are connected
> > to this firewall bus. The firewall can then check the peripheral accesses
> > before allowing it to probe.
> >
> > Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
> > ---
> >
> > Disclaimer: Some error with dtbs_check will be observed as I've
> > considered the property to be generic, as Rob asked
> >
> >  Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml  | 4 ++++
> >  Documentation/devicetree/bindings/dma/st,stm32-dma.yaml      | 4 ++++
> >  Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml   | 4 ++++
> >  Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml      | 4 ++++
> >  Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml  | 4 ++++
> >  .../devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml      | 4 ++++
> >  Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml  | 4 ++++
> >  .../devicetree/bindings/media/cec/st,stm32-cec.yaml          | 4 ++++
> >  Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml   | 4 ++++
> >  .../bindings/memory-controllers/st,stm32-fmc2-ebi.yaml       | 4 ++++
> >  Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml  | 4 ++++
> >  Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml   | 5 +++++
> >  Documentation/devicetree/bindings/mmc/arm,pl18x.yaml         | 4 ++++
> >  Documentation/devicetree/bindings/net/stm32-dwmac.yaml       | 4 ++++
> >  Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml | 4 ++++
> >  .../devicetree/bindings/regulator/st,stm32-vrefbuf.yaml      | 4 ++++
> >  Documentation/devicetree/bindings/rng/st,stm32-rng.yaml      | 4 ++++
> >  Documentation/devicetree/bindings/serial/st,stm32-uart.yaml  | 4 ++++
> >  Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml    | 4 ++++
> >  Documentation/devicetree/bindings/sound/st,stm32-sai.yaml    | 4 ++++
> >  .../devicetree/bindings/sound/st,stm32-spdifrx.yaml          | 4 ++++
> >  Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml     | 4 ++++
> >  Documentation/devicetree/bindings/spi/st,stm32-spi.yaml      | 4 ++++
> >  Documentation/devicetree/bindings/usb/dwc2.yaml              | 4 ++++
> >  24 files changed, 97 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
> > index b767ec72a999..daf8dcaef627 100644
> > --- a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
> > +++ b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
> > @@ -50,6 +50,10 @@ properties:
> >    power-domains:
> >      maxItems: 1
> >  
> > +  feature-domains:
> > +    minItems: 1
> > +    maxItems: 3
> > +
> 
> I beliewe feature-domains is generic binding. This means that maxItems
> can be implementation dependend. I would rather drop maxItems so the
> following format will be possible:
> 
>           feature-domains = <&etzpc 1>, <&etzpc 2>, <&some_other_domain 1 2 3 4>
>           feature-domain-names = "firewall 1", "firewall 2", "other_domain"

The above already allows this (not -names, but the number of entries).
> 
> Also I beliewe driver will handle feature-domain-names property so it
> will parse feature-domains only related to the firewall.

Now I'm curious. What's an example that's not a firewall?

(Note I'm still not happy with the naming of 'feature' as anything is a 
feature, but that's the least of the issues really.)

Rob
Oleksii Moisieiev July 7, 2023, 4:10 p.m. UTC | #7
Hi Rob,

Rob Herring <robh@kernel.org> writes:

> On Fri, Jul 07, 2023 at 02:07:18PM +0000, Oleksii Moisieiev wrote:
>> 
>> Gatien Chevallier <gatien.chevallier@foss.st.com> writes:
>> 
>> > feature-domains is an optional property that allows a peripheral to
>> > refer to one or more feature domain controller(s).
>> >
>> > Description of this property is added to all peripheral binding files of
>> > the peripheral under the STM32 firewall controllers. It allows an accurate
>> > representation of the hardware, where various peripherals are connected
>> > to this firewall bus. The firewall can then check the peripheral accesses
>> > before allowing it to probe.
>> >
>> > Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
>> > ---
>> >
>> > Disclaimer: Some error with dtbs_check will be observed as I've
>> > considered the property to be generic, as Rob asked
>> >
>> >  Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml  | 4 ++++
>> >  Documentation/devicetree/bindings/dma/st,stm32-dma.yaml      | 4 ++++
>> >  Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml   | 4 ++++
>> >  Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml      | 4 ++++
>> >  Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml  | 4 ++++
>> >  .../devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml      | 4 ++++
>> >  Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml  | 4 ++++
>> >  .../devicetree/bindings/media/cec/st,stm32-cec.yaml          | 4 ++++
>> >  Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml   | 4 ++++
>> >  .../bindings/memory-controllers/st,stm32-fmc2-ebi.yaml       | 4 ++++
>> >  Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml  | 4 ++++
>> >  Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml   | 5 +++++
>> >  Documentation/devicetree/bindings/mmc/arm,pl18x.yaml         | 4 ++++
>> >  Documentation/devicetree/bindings/net/stm32-dwmac.yaml       | 4 ++++
>> >  Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml | 4 ++++
>> >  .../devicetree/bindings/regulator/st,stm32-vrefbuf.yaml      | 4 ++++
>> >  Documentation/devicetree/bindings/rng/st,stm32-rng.yaml      | 4 ++++
>> >  Documentation/devicetree/bindings/serial/st,stm32-uart.yaml  | 4 ++++
>> >  Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml    | 4 ++++
>> >  Documentation/devicetree/bindings/sound/st,stm32-sai.yaml    | 4 ++++
>> >  .../devicetree/bindings/sound/st,stm32-spdifrx.yaml          | 4 ++++
>> >  Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml     | 4 ++++
>> >  Documentation/devicetree/bindings/spi/st,stm32-spi.yaml      | 4 ++++
>> >  Documentation/devicetree/bindings/usb/dwc2.yaml              | 4 ++++
>> >  24 files changed, 97 insertions(+)
>> >
>> > diff --git a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
>> > index b767ec72a999..daf8dcaef627 100644
>> > --- a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
>> > +++ b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
>> > @@ -50,6 +50,10 @@ properties:
>> >    power-domains:
>> >      maxItems: 1
>> >  
>> > +  feature-domains:
>> > +    minItems: 1
>> > +    maxItems: 3
>> > +
>> 
>> I beliewe feature-domains is generic binding. This means that maxItems
>> can be implementation dependend. I would rather drop maxItems so the
>> following format will be possible:
>> 
>>           feature-domains = <&etzpc 1>, <&etzpc 2>, <&some_other_domain 1 2 3 4>
>>           feature-domain-names = "firewall 1", "firewall 2", "other_domain"
>
> The above already allows this (not -names, but the number of entries).
>> 
>> Also I beliewe driver will handle feature-domain-names property so it
>> will parse feature-domains only related to the firewall.
>
> Now I'm curious. What's an example that's not a firewall?
>
> (Note I'm still not happy with the naming of 'feature' as anything is a 
> feature, but that's the least of the issues really.)
>

The alternative usages of feature-domains was originally proposed by me
here:
https://lore.kernel.org/lkml/c869d2751125181a55bc8a88c96e3a892b42f37a.1668070216.git.oleksii_moisieiev@epam.com/

Also I remember Peng Fan also was interested in those bindings.
I think the use-case when one node is protected by firewall and also is
controlled by scmi feature-domain-controller (As was proposed in my
patch series) may take place.

As for the naming maybe you have some thoughts about better name?
Rob Herring (Arm) July 7, 2023, 8:33 p.m. UTC | #8
On Fri, Jul 7, 2023 at 10:10 AM Oleksii Moisieiev
<Oleksii_Moisieiev@epam.com> wrote:
>
>
> Hi Rob,
>
> Rob Herring <robh@kernel.org> writes:
>
> > On Fri, Jul 07, 2023 at 02:07:18PM +0000, Oleksii Moisieiev wrote:
> >>
> >> Gatien Chevallier <gatien.chevallier@foss.st.com> writes:
> >>
> >> > feature-domains is an optional property that allows a peripheral to
> >> > refer to one or more feature domain controller(s).
> >> >
> >> > Description of this property is added to all peripheral binding files of
> >> > the peripheral under the STM32 firewall controllers. It allows an accurate
> >> > representation of the hardware, where various peripherals are connected
> >> > to this firewall bus. The firewall can then check the peripheral accesses
> >> > before allowing it to probe.
> >> >
> >> > Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
> >> > ---
> >> >
> >> > Disclaimer: Some error with dtbs_check will be observed as I've
> >> > considered the property to be generic, as Rob asked
> >> >
> >> >  Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml  | 4 ++++
> >> >  Documentation/devicetree/bindings/dma/st,stm32-dma.yaml      | 4 ++++
> >> >  Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml   | 4 ++++
> >> >  Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml      | 4 ++++
> >> >  Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml  | 4 ++++
> >> >  .../devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml      | 4 ++++
> >> >  Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml  | 4 ++++
> >> >  .../devicetree/bindings/media/cec/st,stm32-cec.yaml          | 4 ++++
> >> >  Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml   | 4 ++++
> >> >  .../bindings/memory-controllers/st,stm32-fmc2-ebi.yaml       | 4 ++++
> >> >  Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml  | 4 ++++
> >> >  Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml   | 5 +++++
> >> >  Documentation/devicetree/bindings/mmc/arm,pl18x.yaml         | 4 ++++
> >> >  Documentation/devicetree/bindings/net/stm32-dwmac.yaml       | 4 ++++
> >> >  Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml | 4 ++++
> >> >  .../devicetree/bindings/regulator/st,stm32-vrefbuf.yaml      | 4 ++++
> >> >  Documentation/devicetree/bindings/rng/st,stm32-rng.yaml      | 4 ++++
> >> >  Documentation/devicetree/bindings/serial/st,stm32-uart.yaml  | 4 ++++
> >> >  Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml    | 4 ++++
> >> >  Documentation/devicetree/bindings/sound/st,stm32-sai.yaml    | 4 ++++
> >> >  .../devicetree/bindings/sound/st,stm32-spdifrx.yaml          | 4 ++++
> >> >  Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml     | 4 ++++
> >> >  Documentation/devicetree/bindings/spi/st,stm32-spi.yaml      | 4 ++++
> >> >  Documentation/devicetree/bindings/usb/dwc2.yaml              | 4 ++++
> >> >  24 files changed, 97 insertions(+)
> >> >
> >> > diff --git a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
> >> > index b767ec72a999..daf8dcaef627 100644
> >> > --- a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
> >> > +++ b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
> >> > @@ -50,6 +50,10 @@ properties:
> >> >    power-domains:
> >> >      maxItems: 1
> >> >
> >> > +  feature-domains:
> >> > +    minItems: 1
> >> > +    maxItems: 3
> >> > +
> >>
> >> I beliewe feature-domains is generic binding. This means that maxItems
> >> can be implementation dependend. I would rather drop maxItems so the
> >> following format will be possible:
> >>
> >>           feature-domains = <&etzpc 1>, <&etzpc 2>, <&some_other_domain 1 2 3 4>
> >>           feature-domain-names = "firewall 1", "firewall 2", "other_domain"
> >
> > The above already allows this (not -names, but the number of entries).
> >>
> >> Also I beliewe driver will handle feature-domain-names property so it
> >> will parse feature-domains only related to the firewall.
> >
> > Now I'm curious. What's an example that's not a firewall?
> >
> > (Note I'm still not happy with the naming of 'feature' as anything is a
> > feature, but that's the least of the issues really.)
> >
>
> The alternative usages of feature-domains was originally proposed by me
> here:
> https://lore.kernel.org/lkml/c869d2751125181a55bc8a88c96e3a892b42f37a.1668070216.git.oleksii_moisieiev@epam.com/
>
> Also I remember Peng Fan also was interested in those bindings.

It helps to Cc people when you talk about them.

If the parties interested in this want to see progress on this, you
all must work together and show this is a solution for multiple
platforms.

> I think the use-case when one node is protected by firewall and also is
> controlled by scmi feature-domain-controller (As was proposed in my
> patch series) may take place.

But isn't the SCMI device protection interface the same thing? Some
interface to say "can I access this device?" and/or control access to
it.

The other possible use I'm aware of is system partitioning. OpenAMP or
similar where an SoC is partitioned into multiple OS instances and
peripherals are assigned to different partitions.

> As for the naming maybe you have some thoughts about better name?

If I did, I would have. Something with 'access' in it is as far as I've gotten.

Rob
Rob Herring (Arm) July 10, 2023, 2:42 p.m. UTC | #9
On Mon, Jul 10, 2023 at 10:22:10AM +0200, Gatien CHEVALLIER wrote:
> 
> 
> On 7/7/23 17:20, Rob Herring wrote:
> > On Fri, Jul 07, 2023 at 02:28:28PM +0200, Gatien CHEVALLIER wrote:
> > > Hello Rob,
> > > 
> > > On 7/6/23 16:51, Rob Herring wrote:
> > > > On Wed, Jul 05, 2023 at 07:27:53PM +0200, Gatien Chevallier wrote:
> > > > > feature-domains is an optional property that allows a peripheral to
> > > > > refer to one or more feature domain controller(s).
> > > > > 
> > > > > Description of this property is added to all peripheral binding files of
> > > > > the peripheral under the STM32 firewall controllers. It allows an accurate
> > > > > representation of the hardware, where various peripherals are connected
> > > > > to this firewall bus. The firewall can then check the peripheral accesses
> > > > > before allowing it to probe.
> > > > > 
> > > > > Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
> > > > > ---
> > > > > 
> > > > > Disclaimer: Some error with dtbs_check will be observed as I've
> > > > > considered the property to be generic, as Rob asked
> > > > > 
> > > > >    Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml  | 4 ++++
> > > > >    Documentation/devicetree/bindings/dma/st,stm32-dma.yaml      | 4 ++++
> > > > >    Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml   | 4 ++++
> > > > >    Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml      | 4 ++++
> > > > >    Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml  | 4 ++++
> > > > >    .../devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml      | 4 ++++
> > > > >    Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml  | 4 ++++
> > > > >    .../devicetree/bindings/media/cec/st,stm32-cec.yaml          | 4 ++++
> > > > >    Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml   | 4 ++++
> > > > >    .../bindings/memory-controllers/st,stm32-fmc2-ebi.yaml       | 4 ++++
> > > > >    Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml  | 4 ++++
> > > > >    Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml   | 5 +++++
> > > > >    Documentation/devicetree/bindings/mmc/arm,pl18x.yaml         | 4 ++++
> > > > >    Documentation/devicetree/bindings/net/stm32-dwmac.yaml       | 4 ++++
> > > > >    Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml | 4 ++++
> > > > >    .../devicetree/bindings/regulator/st,stm32-vrefbuf.yaml      | 4 ++++
> > > > >    Documentation/devicetree/bindings/rng/st,stm32-rng.yaml      | 4 ++++
> > > > >    Documentation/devicetree/bindings/serial/st,stm32-uart.yaml  | 4 ++++
> > > > >    Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml    | 4 ++++
> > > > >    Documentation/devicetree/bindings/sound/st,stm32-sai.yaml    | 4 ++++
> > > > >    .../devicetree/bindings/sound/st,stm32-spdifrx.yaml          | 4 ++++
> > > > >    Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml     | 4 ++++
> > > > >    Documentation/devicetree/bindings/spi/st,stm32-spi.yaml      | 4 ++++
> > > > >    Documentation/devicetree/bindings/usb/dwc2.yaml              | 4 ++++
> > > > >    24 files changed, 97 insertions(+)
> > > > > 
> > > > > diff --git a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
> > > > > index b767ec72a999..daf8dcaef627 100644
> > > > > --- a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
> > > > > +++ b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
> > > > > @@ -50,6 +50,10 @@ properties:
> > > > >      power-domains:
> > > > >        maxItems: 1
> > > > > +  feature-domains:
> > > > > +    minItems: 1
> > > > > +    maxItems: 3
> > > > 
> > > > What are the 3 entries?
> > > > 
> > > > Rob
> > > 
> > > I thought I was benefiting from the description of the pattern-property in
> > > the RIFSC YAML file. But yes anyway, it seems like it needs some description
> > > here as the dependency does not appear in this file.
> > 
> > Humm, that should limit the maximum entries to 2, so 3 would never work
> > (if RIFSC is the parent).
> > 
> > > I picked 3 as a maxItems for our ST needs, I'll give it some more thought
> > > when coming back with something clearer.
> > 
> > I'd expect you have 1 entry for register bus and 1 entry for DMA bus if
> > there is one. It's block specific for how many entries, so the RIFSC
> > schema should not be setting that. You could possibly say that
> > 'feature-domains' is required for all the child nodes though.
> 
> Ok, I will change to not specifying the number of entries in the
> RIFSC YAML file for V2.
> 
> > 
> > Rob
> Some hardware blocks may have a firewall ID for their device part and
> another ID for their master part as well. In the end, the number of
> entries could very well vary between different platforms. And the YAML
> files are common to these platforms.

A given device has a fixed number of buses. Usually 1 or 2. That does 
*not* vary by platform (unless the device is modified). You could have 
the same firewall controller and id for multiple buses, but that 
should not change the number of entries for the device. Now maybe a bus 
has no firewall on some platforms. In that case, you should make the 
optional firewall entry the last one, have a null phandle (0 or -1), or 
use -names to distinguish the entries.

> This property could be used for "extra" arguments as well, that are not
> firewall IDs.

The arg cells are dictated by the provider and opaque to the client.

> What do you suggest between picking a high maxItems value that would
> (hopefully) cover all cases and not specifying maxItems at all? Or maybe
> another property dedicated to such arguments?

You should not specify maxItems in the firewall controller binding.

Rob
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
index b767ec72a999..daf8dcaef627 100644
--- a/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
+++ b/Documentation/devicetree/bindings/crypto/st,stm32-hash.yaml
@@ -50,6 +50,10 @@  properties:
   power-domains:
     maxItems: 1
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
 required:
   - compatible
   - reg
diff --git a/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml b/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
index 329847ef096a..2236ac95574b 100644
--- a/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
+++ b/Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
@@ -82,6 +82,10 @@  properties:
     description: if defined, it indicates that the controller
       supports memory-to-memory transfer
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
 required:
   - compatible
   - reg
diff --git a/Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml b/Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml
index e722fbcd8a5f..47ae890f5bd9 100644
--- a/Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml
+++ b/Documentation/devicetree/bindings/dma/st,stm32-dmamux.yaml
@@ -28,6 +28,10 @@  properties:
   resets:
     maxItems: 1
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
 required:
   - compatible
   - reg
diff --git a/Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml b/Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml
index 94b75d9f66cd..326a96741f50 100644
--- a/Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml
+++ b/Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml
@@ -99,6 +99,10 @@  properties:
 
   wakeup-source: true
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
 required:
   - compatible
   - reg
diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml
index 995cbf8cefc6..3eb20d67f0fc 100644
--- a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml
@@ -93,6 +93,10 @@  properties:
   '#size-cells':
     const: 0
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
 allOf:
   - if:
       properties:
diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
index 1970503389aa..bc34ae172417 100644
--- a/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
@@ -59,6 +59,10 @@  properties:
       If not, SPI CLKOUT frequency will not be accurate.
     maximum: 20000000
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
 required:
   - compatible
   - reg
diff --git a/Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml b/Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml
index 04045b932bd2..90d35a2a6504 100644
--- a/Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml
+++ b/Documentation/devicetree/bindings/iio/dac/st,stm32-dac.yaml
@@ -45,6 +45,10 @@  properties:
   '#size-cells':
     const: 0
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
 additionalProperties: false
 
 required:
diff --git a/Documentation/devicetree/bindings/media/cec/st,stm32-cec.yaml b/Documentation/devicetree/bindings/media/cec/st,stm32-cec.yaml
index 2314a9a14650..f88e3c0e6175 100644
--- a/Documentation/devicetree/bindings/media/cec/st,stm32-cec.yaml
+++ b/Documentation/devicetree/bindings/media/cec/st,stm32-cec.yaml
@@ -29,6 +29,10 @@  properties:
       - const: cec
       - const: hdmi-cec
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
 required:
   - compatible
   - reg
diff --git a/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml b/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml
index 6b3e413cedb2..4fa1d14910df 100644
--- a/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml
+++ b/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml
@@ -36,6 +36,10 @@  properties:
   resets:
     maxItems: 1
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
   port:
     $ref: /schemas/graph.yaml#/$defs/port-base
     unevaluatedProperties: false
diff --git a/Documentation/devicetree/bindings/memory-controllers/st,stm32-fmc2-ebi.yaml b/Documentation/devicetree/bindings/memory-controllers/st,stm32-fmc2-ebi.yaml
index 14f1833d37c9..63b3d012147b 100644
--- a/Documentation/devicetree/bindings/memory-controllers/st,stm32-fmc2-ebi.yaml
+++ b/Documentation/devicetree/bindings/memory-controllers/st,stm32-fmc2-ebi.yaml
@@ -45,6 +45,10 @@  properties:
       Reflects the memory layout with four integer values per bank. Format:
       <bank-number> 0 <address of the bank> <size>
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
 patternProperties:
   "^.*@[0-4],[a-f0-9]+$":
     additionalProperties: true
diff --git a/Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml b/Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml
index 27329c5dc38e..59d770544950 100644
--- a/Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml
+++ b/Documentation/devicetree/bindings/mfd/st,stm32-lptimer.yaml
@@ -44,6 +44,10 @@  properties:
 
   wakeup-source: true
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
   pwm:
     type: object
     additionalProperties: false
diff --git a/Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml b/Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml
index f84e09a5743b..d5ad097e94ec 100644
--- a/Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml
+++ b/Documentation/devicetree/bindings/mfd/st,stm32-timers.yaml
@@ -67,6 +67,11 @@  properties:
   "#size-cells":
     const: 0
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
+
   pwm:
     type: object
     additionalProperties: false
diff --git a/Documentation/devicetree/bindings/mmc/arm,pl18x.yaml b/Documentation/devicetree/bindings/mmc/arm,pl18x.yaml
index 2459a55ed540..6ebedee65153 100644
--- a/Documentation/devicetree/bindings/mmc/arm,pl18x.yaml
+++ b/Documentation/devicetree/bindings/mmc/arm,pl18x.yaml
@@ -79,6 +79,10 @@  properties:
           - const: rx
           - const: tx
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
   power-domains: true
 
   resets:
diff --git a/Documentation/devicetree/bindings/net/stm32-dwmac.yaml b/Documentation/devicetree/bindings/net/stm32-dwmac.yaml
index fc8c96b08d7d..0e408dc85c13 100644
--- a/Documentation/devicetree/bindings/net/stm32-dwmac.yaml
+++ b/Documentation/devicetree/bindings/net/stm32-dwmac.yaml
@@ -93,6 +93,10 @@  properties:
       select RCC clock instead of ETH_REF_CLK.
     type: boolean
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
 required:
   - compatible
   - clocks
diff --git a/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml b/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml
index 24a3dbde223b..b9ac20c8bf05 100644
--- a/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml
+++ b/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml
@@ -55,6 +55,10 @@  properties:
     description: number of clock cells for ck_usbo_48m consumer
     const: 0
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
 # Required child nodes:
 
 patternProperties:
diff --git a/Documentation/devicetree/bindings/regulator/st,stm32-vrefbuf.yaml b/Documentation/devicetree/bindings/regulator/st,stm32-vrefbuf.yaml
index 05f4ad2c7d3a..02cefe4ef42b 100644
--- a/Documentation/devicetree/bindings/regulator/st,stm32-vrefbuf.yaml
+++ b/Documentation/devicetree/bindings/regulator/st,stm32-vrefbuf.yaml
@@ -30,6 +30,10 @@  properties:
   vdda-supply:
     description: phandle to the vdda input analog voltage.
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
 required:
   - compatible
   - reg
diff --git a/Documentation/devicetree/bindings/rng/st,stm32-rng.yaml b/Documentation/devicetree/bindings/rng/st,stm32-rng.yaml
index 187b172d0cca..79eb5f5bd252 100644
--- a/Documentation/devicetree/bindings/rng/st,stm32-rng.yaml
+++ b/Documentation/devicetree/bindings/rng/st,stm32-rng.yaml
@@ -30,6 +30,10 @@  properties:
     type: boolean
     description: If set enable the clock detection management
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
 required:
   - compatible
   - reg
diff --git a/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml b/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
index 1df8ffe95fc6..893978e7170f 100644
--- a/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
+++ b/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
@@ -70,6 +70,10 @@  properties:
     enum: [1, 2, 4, 8, 12, 14, 16]
     default: 8
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
 allOf:
   - $ref: rs485.yaml#
   - $ref: serial.yaml#
diff --git a/Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml b/Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml
index b9111d375b93..64c5898e51f8 100644
--- a/Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml
+++ b/Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml
@@ -65,6 +65,10 @@  properties:
     $ref: audio-graph-port.yaml#
     unevaluatedProperties: false
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
 required:
   - compatible
   - "#sound-dai-cells"
diff --git a/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml b/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml
index 56d206f97a96..9bc08b7645dc 100644
--- a/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml
+++ b/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml
@@ -48,6 +48,10 @@  properties:
   clock-names:
     maxItems: 3
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
 required:
   - compatible
   - reg
diff --git a/Documentation/devicetree/bindings/sound/st,stm32-spdifrx.yaml b/Documentation/devicetree/bindings/sound/st,stm32-spdifrx.yaml
index bc48151b9adb..f00e5db9ee3b 100644
--- a/Documentation/devicetree/bindings/sound/st,stm32-spdifrx.yaml
+++ b/Documentation/devicetree/bindings/sound/st,stm32-spdifrx.yaml
@@ -50,6 +50,10 @@  properties:
   resets:
     maxItems: 1
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
 required:
   - compatible
   - "#sound-dai-cells"
diff --git a/Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml b/Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml
index 8bba965a9ae6..2ac136802467 100644
--- a/Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml
+++ b/Documentation/devicetree/bindings/spi/st,stm32-qspi.yaml
@@ -46,6 +46,10 @@  properties:
       - const: tx
       - const: rx
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
 required:
   - compatible
   - reg
diff --git a/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml b/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
index 9ca1a843c820..725c26daabe4 100644
--- a/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
+++ b/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
@@ -59,6 +59,10 @@  properties:
       - const: rx
       - const: tx
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
 patternProperties:
   "^[a-zA-Z][a-zA-Z0-9,+\\-._]{0,63}@[0-9a-f]+$":
     type: object
diff --git a/Documentation/devicetree/bindings/usb/dwc2.yaml b/Documentation/devicetree/bindings/usb/dwc2.yaml
index d3506090f8b1..c372caf154fc 100644
--- a/Documentation/devicetree/bindings/usb/dwc2.yaml
+++ b/Documentation/devicetree/bindings/usb/dwc2.yaml
@@ -171,6 +171,10 @@  properties:
 
   tpl-support: true
 
+  feature-domains:
+    minItems: 1
+    maxItems: 3
+
 dependencies:
   port: [ usb-role-switch ]
   role-switch-default-mode: [ usb-role-switch ]