diff mbox series

[RFC,v2,03/11] dt-bindings: iio: stm32-dfsdm-adc: add scaling support

Message ID 20230727150324.1157933-4-olivier.moysan@foss.st.com
State New
Headers show
Series iio: add iio backend device type | expand

Commit Message

Olivier Moysan July 27, 2023, 3:03 p.m. UTC
Add scaling support to STM32 DFSDM.

This introduces the following changes:
- Add ADC generic channel binding and remove support of deprecated
channel bindings.
- DFSDM is now implemented as a channel provider, so remove io-channels
properties.
- Add iio-backend property to connect DFSDM to an SD modulator.

Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
---
 .../bindings/iio/adc/st,stm32-dfsdm-adc.yaml  | 189 ++++++------------
 1 file changed, 63 insertions(+), 126 deletions(-)

Comments

Rob Herring (Arm) Aug. 11, 2023, 5:10 p.m. UTC | #1
On Thu, Jul 27, 2023 at 05:03:14PM +0200, Olivier Moysan wrote:
> Add scaling support to STM32 DFSDM.
> 
> This introduces the following changes:

Why?

> - Add ADC generic channel binding and remove support of deprecated
> channel bindings.

When was it deprecated?

> - DFSDM is now implemented as a channel provider, so remove io-channels
> properties.
> - Add iio-backend property to connect DFSDM to an SD modulator.

io-backends

All sorts of ABI issues with this change. Please explain why you don't 
care.

> 
> Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
> ---
>  .../bindings/iio/adc/st,stm32-dfsdm-adc.yaml  | 189 ++++++------------
>  1 file changed, 63 insertions(+), 126 deletions(-)
> 
> 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..128545cedc7f 100644
> --- a/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
> @@ -85,22 +85,14 @@ patternProperties:
>          description: Specifies the DFSDM filter instance used.
>          maxItems: 1
>  
> -      interrupts:
> -        maxItems: 1
> +      '#address-cells':
> +        const: 1
>  
> -      st,adc-channels:
> -        description: |
> -          List of single-ended channels muxed for this ADC.
> -          On stm32h7 and stm32mp1:
> -          - For st,stm32-dfsdm-adc: up to 8 channels numbered from 0 to 7.
> -          - For st,stm32-dfsdm-dmic: 1 channel numbered from 0 to 7.
> -        $ref: /schemas/types.yaml#/definitions/uint32-array
> -        items:
> -          minimum: 0
> -          maximum: 7
> +      '#size-cells':
> +        const: 0
>  
> -      st,adc-channel-names:
> -        description: List of single-ended channel names.
> +      interrupts:
> +        maxItems: 1
>  
>        st,filter-order:
>          description: |
> @@ -111,39 +103,6 @@ patternProperties:
>          $ref: /schemas/types.yaml#/definitions/uint32
>          maximum: 5
>  
> -      "#io-channel-cells":
> -        const: 1
> -
> -      st,adc-channel-types:
> -        description: |
> -          Single-ended channel input type.
> -          - "SPI_R": SPI with data on rising edge (default)
> -          - "SPI_F": SPI with data on falling edge
> -          - "MANCH_R": manchester codec, rising edge = logic 0, falling edge = logic 1
> -          - "MANCH_F": manchester codec, rising edge = logic 1, falling edge = logic 0
> -        items:
> -          enum: [ SPI_R, SPI_F, MANCH_R, MANCH_F ]
> -        $ref: /schemas/types.yaml#/definitions/non-unique-string-array
> -
> -      st,adc-channel-clk-src:
> -        description: |
> -          Conversion clock source.
> -          - "CLKIN": external SPI clock (CLKIN x)
> -          - "CLKOUT": internal SPI clock (CLKOUT) (default)
> -          - "CLKOUT_F": internal SPI clock divided by 2 (falling edge).
> -          - "CLKOUT_R": internal SPI clock divided by 2 (rising edge).
> -        items:
> -          enum: [ CLKIN, CLKOUT, CLKOUT_F, CLKOUT_R ]
> -        $ref: /schemas/types.yaml#/definitions/non-unique-string-array
> -
> -      st,adc-alt-channel:
> -        description:
> -          Must be defined if two sigma delta modulators are
> -          connected on same SPI input.
> -          If not set, channel n is connected to SPI input n.
> -          If set, channel n is connected to SPI input n + 1.
> -        type: boolean
> -
>        st,filter0-sync:
>          description:
>            Set to 1 to synchronize with DFSDM filter instance 0.
> @@ -157,14 +116,68 @@ patternProperties:
>          items:
>            - const: rx
>  
> +    patternProperties:
> +      "^channel@([0-9]|1[0-9])$":
> +        type: object
> +        $ref: "adc.yaml"
> +        description: Represents the external channels which are connected to the DFSDM.
> +
> +        properties:
> +          reg:
> +            items:
> +              minimum: 0
> +              maximum: 19
> +
> +          label:
> +            description: |
> +              Unique name to identify channel.
> +
> +          st,adc-channel-types:
> +            description: |
> +              Single-ended channel input type.
> +              - "SPI_R": SPI with data on rising edge (default)
> +              - "SPI_F": SPI with data on falling edge
> +              - "MANCH_R": manchester codec, rising edge = logic 0, falling edge = logic 1
> +              - "MANCH_F": manchester codec, rising edge = logic 1, falling edge = logic 0
> +            items:
> +              enum: [ SPI_R, SPI_F, MANCH_R, MANCH_F ]
> +            $ref: /schemas/types.yaml#/definitions/non-unique-string-array
> +
> +          st,adc-channel-clk-src:
> +            description: |
> +              Conversion clock source.
> +              - "CLKIN": external SPI clock (CLKIN x)
> +              - "CLKOUT": internal SPI clock (CLKOUT) (default)
> +              - "CLKOUT_F": internal SPI clock divided by 2 (falling edge).
> +              - "CLKOUT_R": internal SPI clock divided by 2 (rising edge).
> +            items:
> +              enum: [ CLKIN, CLKOUT, CLKOUT_F, CLKOUT_R ]
> +            $ref: /schemas/types.yaml#/definitions/non-unique-string-array
> +
> +          st,adc-alt-channel:
> +            description:
> +              Must be defined if two sigma delta modulators are
> +              connected on same SPI input.
> +              If not set, channel n is connected to SPI input n.
> +              If set, channel n is connected to SPI input n + 1.
> +            type: boolean
> +
> +          io-backends:
> +            description: |
> +              phandle to an external sigma delta modulator or internal ADC output.
> +            $ref: /schemas/types.yaml#/definitions/phandle
> +
> +        required:
> +          - reg
> +          - io-backends
> +
> +        additionalProperties: false
> +
>      required:
>        - compatible
>        - reg
>        - interrupts
> -      - st,adc-channels
> -      - st,adc-channel-names
>        - st,filter-order
> -      - "#io-channel-cells"
>  
>      allOf:
>        - if:
> @@ -175,14 +188,6 @@ patternProperties:
>  
>          then:
>            properties:
> -            st,adc-channels:
> -              minItems: 1
> -              maxItems: 8
> -
> -            st,adc-channel-names:
> -              minItems: 1
> -              maxItems: 8
> -
>              st,adc-channel-types:
>                minItems: 1
>                maxItems: 8
> @@ -191,14 +196,6 @@ patternProperties:
>                minItems: 1
>                maxItems: 8
>  
> -            io-channels:
> -              description:
> -                From common IIO binding. Used to pipe external sigma delta
> -                modulator or internal ADC output to DFSDM channel.
> -
> -          required:
> -            - io-channels
> -
>        - if:
>            properties:
>              compatible:
> @@ -207,12 +204,6 @@ patternProperties:
>  
>          then:
>            properties:
> -            st,adc-channels:
> -              maxItems: 1
> -
> -            st,adc-channel-names:
> -              maxItems: 1
> -
>              st,adc-channel-types:
>                maxItems: 1
>  
> @@ -237,15 +228,9 @@ patternProperties:
>                  "#sound-dai-cells":
>                    const: 0
>  
> -                io-channels:
> -                  description:
> -                    From common IIO binding. Used to pipe external sigma delta
> -                    modulator or internal ADC output to DFSDM channel.
> -
>                required:
>                  - compatible
>                  - "#sound-dai-cells"
> -                - io-channels
>  
>  allOf:
>    - if:
> @@ -278,52 +263,4 @@ allOf:
>                  minimum: 0
>                  maximum: 5
>  
> -examples:
> -  - |
> -    #include <dt-bindings/interrupt-controller/arm-gic.h>
> -    #include <dt-bindings/clock/stm32mp1-clks.h>
> -    dfsdm: dfsdm@4400d000 {
> -      compatible = "st,stm32mp1-dfsdm";
> -      reg = <0x4400d000 0x800>;
> -      clocks = <&rcc DFSDM_K>, <&rcc ADFSDM_K>;
> -      clock-names = "dfsdm", "audio";
> -      #address-cells = <1>;
> -      #size-cells = <0>;
> -
> -      dfsdm0: filter@0 {
> -        compatible = "st,stm32-dfsdm-dmic";
> -        reg = <0>;
> -        interrupts = <GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH>;
> -        dmas = <&dmamux1 101 0x400 0x01>;
> -        dma-names = "rx";
> -        #io-channel-cells = <1>;
> -        st,adc-channels = <1>;
> -        st,adc-channel-names = "dmic0";
> -        st,adc-channel-types = "SPI_R";
> -        st,adc-channel-clk-src = "CLKOUT";
> -        st,filter-order = <5>;
> -
> -        asoc_pdm0: dfsdm-dai {
> -          compatible = "st,stm32h7-dfsdm-dai";
> -          #sound-dai-cells = <0>;
> -          io-channels = <&dfsdm0 0>;
> -        };
> -      };
> -
> -      dfsdm_pdm1: filter@1 {
> -        compatible = "st,stm32-dfsdm-adc";
> -        reg = <1>;
> -        interrupts = <GIC_SPI 111 IRQ_TYPE_LEVEL_HIGH>;
> -        dmas = <&dmamux1 102 0x400 0x01>;
> -        dma-names = "rx";
> -        #io-channel-cells = <1>;
> -        st,adc-channels = <2 3>;
> -        st,adc-channel-names = "in2", "in3";
> -        st,adc-channel-types = "SPI_R", "SPI_R";
> -        st,adc-channel-clk-src = "CLKOUT_F", "CLKOUT_F";
> -        io-channels = <&sd_adc2 &sd_adc3>;
> -        st,filter-order = <1>;
> -      };
> -    };
> -
>  ...
> -- 
> 2.25.1
>
Olivier Moysan Aug. 31, 2023, 3:53 p.m. UTC | #2
Hi Rob,

On 8/11/23 19:10, Rob Herring wrote:
> On Thu, Jul 27, 2023 at 05:03:14PM +0200, Olivier Moysan wrote:
>> Add scaling support to STM32 DFSDM.
>>
>> This introduces the following changes:
> 
> Why?
> 

This RFC is an attempt to support scaling through a change in DFSDM 
topology.

These changes have some impacts on DFSDM and sd modulator bindings.
To keep things simple in this RFC, I skipped legacy support, to put the 
emphasis on the new bindings proposal.
There are two changes here: adoption of the generic IIO bindings and new 
"io-backends" property. This needs to be put in two separate patches at 
the end, I think (as already done for driver patches)

Anyway, the current bindings would become deprecated with these changes. 
I still have to consider how to support these legacy bindings for next 
step, However.

BRs
Olivier

>> - Add ADC generic channel binding and remove support of deprecated
>> channel bindings.
> 
> When was it deprecated?
> 
>> - DFSDM is now implemented as a channel provider, so remove io-channels
>> properties.
>> - Add iio-backend property to connect DFSDM to an SD modulator.
> 
> io-backends
> 
> All sorts of ABI issues with this change. Please explain why you don't
> care.
> 
>>
>> Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
>> ---
>>   .../bindings/iio/adc/st,stm32-dfsdm-adc.yaml  | 189 ++++++------------
>>   1 file changed, 63 insertions(+), 126 deletions(-)
>>
>> 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..128545cedc7f 100644
>> --- a/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
>> +++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
>> @@ -85,22 +85,14 @@ patternProperties:
>>           description: Specifies the DFSDM filter instance used.
>>           maxItems: 1
>>   
>> -      interrupts:
>> -        maxItems: 1
>> +      '#address-cells':
>> +        const: 1
>>   
>> -      st,adc-channels:
>> -        description: |
>> -          List of single-ended channels muxed for this ADC.
>> -          On stm32h7 and stm32mp1:
>> -          - For st,stm32-dfsdm-adc: up to 8 channels numbered from 0 to 7.
>> -          - For st,stm32-dfsdm-dmic: 1 channel numbered from 0 to 7.
>> -        $ref: /schemas/types.yaml#/definitions/uint32-array
>> -        items:
>> -          minimum: 0
>> -          maximum: 7
>> +      '#size-cells':
>> +        const: 0
>>   
>> -      st,adc-channel-names:
>> -        description: List of single-ended channel names.
>> +      interrupts:
>> +        maxItems: 1
>>   
>>         st,filter-order:
>>           description: |
>> @@ -111,39 +103,6 @@ patternProperties:
>>           $ref: /schemas/types.yaml#/definitions/uint32
>>           maximum: 5
>>   
>> -      "#io-channel-cells":
>> -        const: 1
>> -
>> -      st,adc-channel-types:
>> -        description: |
>> -          Single-ended channel input type.
>> -          - "SPI_R": SPI with data on rising edge (default)
>> -          - "SPI_F": SPI with data on falling edge
>> -          - "MANCH_R": manchester codec, rising edge = logic 0, falling edge = logic 1
>> -          - "MANCH_F": manchester codec, rising edge = logic 1, falling edge = logic 0
>> -        items:
>> -          enum: [ SPI_R, SPI_F, MANCH_R, MANCH_F ]
>> -        $ref: /schemas/types.yaml#/definitions/non-unique-string-array
>> -
>> -      st,adc-channel-clk-src:
>> -        description: |
>> -          Conversion clock source.
>> -          - "CLKIN": external SPI clock (CLKIN x)
>> -          - "CLKOUT": internal SPI clock (CLKOUT) (default)
>> -          - "CLKOUT_F": internal SPI clock divided by 2 (falling edge).
>> -          - "CLKOUT_R": internal SPI clock divided by 2 (rising edge).
>> -        items:
>> -          enum: [ CLKIN, CLKOUT, CLKOUT_F, CLKOUT_R ]
>> -        $ref: /schemas/types.yaml#/definitions/non-unique-string-array
>> -
>> -      st,adc-alt-channel:
>> -        description:
>> -          Must be defined if two sigma delta modulators are
>> -          connected on same SPI input.
>> -          If not set, channel n is connected to SPI input n.
>> -          If set, channel n is connected to SPI input n + 1.
>> -        type: boolean
>> -
>>         st,filter0-sync:
>>           description:
>>             Set to 1 to synchronize with DFSDM filter instance 0.
>> @@ -157,14 +116,68 @@ patternProperties:
>>           items:
>>             - const: rx
>>   
>> +    patternProperties:
>> +      "^channel@([0-9]|1[0-9])$":
>> +        type: object
>> +        $ref: "adc.yaml"
>> +        description: Represents the external channels which are connected to the DFSDM.
>> +
>> +        properties:
>> +          reg:
>> +            items:
>> +              minimum: 0
>> +              maximum: 19
>> +
>> +          label:
>> +            description: |
>> +              Unique name to identify channel.
>> +
>> +          st,adc-channel-types:
>> +            description: |
>> +              Single-ended channel input type.
>> +              - "SPI_R": SPI with data on rising edge (default)
>> +              - "SPI_F": SPI with data on falling edge
>> +              - "MANCH_R": manchester codec, rising edge = logic 0, falling edge = logic 1
>> +              - "MANCH_F": manchester codec, rising edge = logic 1, falling edge = logic 0
>> +            items:
>> +              enum: [ SPI_R, SPI_F, MANCH_R, MANCH_F ]
>> +            $ref: /schemas/types.yaml#/definitions/non-unique-string-array
>> +
>> +          st,adc-channel-clk-src:
>> +            description: |
>> +              Conversion clock source.
>> +              - "CLKIN": external SPI clock (CLKIN x)
>> +              - "CLKOUT": internal SPI clock (CLKOUT) (default)
>> +              - "CLKOUT_F": internal SPI clock divided by 2 (falling edge).
>> +              - "CLKOUT_R": internal SPI clock divided by 2 (rising edge).
>> +            items:
>> +              enum: [ CLKIN, CLKOUT, CLKOUT_F, CLKOUT_R ]
>> +            $ref: /schemas/types.yaml#/definitions/non-unique-string-array
>> +
>> +          st,adc-alt-channel:
>> +            description:
>> +              Must be defined if two sigma delta modulators are
>> +              connected on same SPI input.
>> +              If not set, channel n is connected to SPI input n.
>> +              If set, channel n is connected to SPI input n + 1.
>> +            type: boolean
>> +
>> +          io-backends:
>> +            description: |
>> +              phandle to an external sigma delta modulator or internal ADC output.
>> +            $ref: /schemas/types.yaml#/definitions/phandle
>> +
>> +        required:
>> +          - reg
>> +          - io-backends
>> +
>> +        additionalProperties: false
>> +
>>       required:
>>         - compatible
>>         - reg
>>         - interrupts
>> -      - st,adc-channels
>> -      - st,adc-channel-names
>>         - st,filter-order
>> -      - "#io-channel-cells"
>>   
>>       allOf:
>>         - if:
>> @@ -175,14 +188,6 @@ patternProperties:
>>   
>>           then:
>>             properties:
>> -            st,adc-channels:
>> -              minItems: 1
>> -              maxItems: 8
>> -
>> -            st,adc-channel-names:
>> -              minItems: 1
>> -              maxItems: 8
>> -
>>               st,adc-channel-types:
>>                 minItems: 1
>>                 maxItems: 8
>> @@ -191,14 +196,6 @@ patternProperties:
>>                 minItems: 1
>>                 maxItems: 8
>>   
>> -            io-channels:
>> -              description:
>> -                From common IIO binding. Used to pipe external sigma delta
>> -                modulator or internal ADC output to DFSDM channel.
>> -
>> -          required:
>> -            - io-channels
>> -
>>         - if:
>>             properties:
>>               compatible:
>> @@ -207,12 +204,6 @@ patternProperties:
>>   
>>           then:
>>             properties:
>> -            st,adc-channels:
>> -              maxItems: 1
>> -
>> -            st,adc-channel-names:
>> -              maxItems: 1
>> -
>>               st,adc-channel-types:
>>                 maxItems: 1
>>   
>> @@ -237,15 +228,9 @@ patternProperties:
>>                   "#sound-dai-cells":
>>                     const: 0
>>   
>> -                io-channels:
>> -                  description:
>> -                    From common IIO binding. Used to pipe external sigma delta
>> -                    modulator or internal ADC output to DFSDM channel.
>> -
>>                 required:
>>                   - compatible
>>                   - "#sound-dai-cells"
>> -                - io-channels
>>   
>>   allOf:
>>     - if:
>> @@ -278,52 +263,4 @@ allOf:
>>                   minimum: 0
>>                   maximum: 5
>>   
>> -examples:
>> -  - |
>> -    #include <dt-bindings/interrupt-controller/arm-gic.h>
>> -    #include <dt-bindings/clock/stm32mp1-clks.h>
>> -    dfsdm: dfsdm@4400d000 {
>> -      compatible = "st,stm32mp1-dfsdm";
>> -      reg = <0x4400d000 0x800>;
>> -      clocks = <&rcc DFSDM_K>, <&rcc ADFSDM_K>;
>> -      clock-names = "dfsdm", "audio";
>> -      #address-cells = <1>;
>> -      #size-cells = <0>;
>> -
>> -      dfsdm0: filter@0 {
>> -        compatible = "st,stm32-dfsdm-dmic";
>> -        reg = <0>;
>> -        interrupts = <GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH>;
>> -        dmas = <&dmamux1 101 0x400 0x01>;
>> -        dma-names = "rx";
>> -        #io-channel-cells = <1>;
>> -        st,adc-channels = <1>;
>> -        st,adc-channel-names = "dmic0";
>> -        st,adc-channel-types = "SPI_R";
>> -        st,adc-channel-clk-src = "CLKOUT";
>> -        st,filter-order = <5>;
>> -
>> -        asoc_pdm0: dfsdm-dai {
>> -          compatible = "st,stm32h7-dfsdm-dai";
>> -          #sound-dai-cells = <0>;
>> -          io-channels = <&dfsdm0 0>;
>> -        };
>> -      };
>> -
>> -      dfsdm_pdm1: filter@1 {
>> -        compatible = "st,stm32-dfsdm-adc";
>> -        reg = <1>;
>> -        interrupts = <GIC_SPI 111 IRQ_TYPE_LEVEL_HIGH>;
>> -        dmas = <&dmamux1 102 0x400 0x01>;
>> -        dma-names = "rx";
>> -        #io-channel-cells = <1>;
>> -        st,adc-channels = <2 3>;
>> -        st,adc-channel-names = "in2", "in3";
>> -        st,adc-channel-types = "SPI_R", "SPI_R";
>> -        st,adc-channel-clk-src = "CLKOUT_F", "CLKOUT_F";
>> -        io-channels = <&sd_adc2 &sd_adc3>;
>> -        st,filter-order = <1>;
>> -      };
>> -    };
>> -
>>   ...
>> -- 
>> 2.25.1
>>
diff mbox series

Patch

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..128545cedc7f 100644
--- a/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
@@ -85,22 +85,14 @@  patternProperties:
         description: Specifies the DFSDM filter instance used.
         maxItems: 1
 
-      interrupts:
-        maxItems: 1
+      '#address-cells':
+        const: 1
 
-      st,adc-channels:
-        description: |
-          List of single-ended channels muxed for this ADC.
-          On stm32h7 and stm32mp1:
-          - For st,stm32-dfsdm-adc: up to 8 channels numbered from 0 to 7.
-          - For st,stm32-dfsdm-dmic: 1 channel numbered from 0 to 7.
-        $ref: /schemas/types.yaml#/definitions/uint32-array
-        items:
-          minimum: 0
-          maximum: 7
+      '#size-cells':
+        const: 0
 
-      st,adc-channel-names:
-        description: List of single-ended channel names.
+      interrupts:
+        maxItems: 1
 
       st,filter-order:
         description: |
@@ -111,39 +103,6 @@  patternProperties:
         $ref: /schemas/types.yaml#/definitions/uint32
         maximum: 5
 
-      "#io-channel-cells":
-        const: 1
-
-      st,adc-channel-types:
-        description: |
-          Single-ended channel input type.
-          - "SPI_R": SPI with data on rising edge (default)
-          - "SPI_F": SPI with data on falling edge
-          - "MANCH_R": manchester codec, rising edge = logic 0, falling edge = logic 1
-          - "MANCH_F": manchester codec, rising edge = logic 1, falling edge = logic 0
-        items:
-          enum: [ SPI_R, SPI_F, MANCH_R, MANCH_F ]
-        $ref: /schemas/types.yaml#/definitions/non-unique-string-array
-
-      st,adc-channel-clk-src:
-        description: |
-          Conversion clock source.
-          - "CLKIN": external SPI clock (CLKIN x)
-          - "CLKOUT": internal SPI clock (CLKOUT) (default)
-          - "CLKOUT_F": internal SPI clock divided by 2 (falling edge).
-          - "CLKOUT_R": internal SPI clock divided by 2 (rising edge).
-        items:
-          enum: [ CLKIN, CLKOUT, CLKOUT_F, CLKOUT_R ]
-        $ref: /schemas/types.yaml#/definitions/non-unique-string-array
-
-      st,adc-alt-channel:
-        description:
-          Must be defined if two sigma delta modulators are
-          connected on same SPI input.
-          If not set, channel n is connected to SPI input n.
-          If set, channel n is connected to SPI input n + 1.
-        type: boolean
-
       st,filter0-sync:
         description:
           Set to 1 to synchronize with DFSDM filter instance 0.
@@ -157,14 +116,68 @@  patternProperties:
         items:
           - const: rx
 
+    patternProperties:
+      "^channel@([0-9]|1[0-9])$":
+        type: object
+        $ref: "adc.yaml"
+        description: Represents the external channels which are connected to the DFSDM.
+
+        properties:
+          reg:
+            items:
+              minimum: 0
+              maximum: 19
+
+          label:
+            description: |
+              Unique name to identify channel.
+
+          st,adc-channel-types:
+            description: |
+              Single-ended channel input type.
+              - "SPI_R": SPI with data on rising edge (default)
+              - "SPI_F": SPI with data on falling edge
+              - "MANCH_R": manchester codec, rising edge = logic 0, falling edge = logic 1
+              - "MANCH_F": manchester codec, rising edge = logic 1, falling edge = logic 0
+            items:
+              enum: [ SPI_R, SPI_F, MANCH_R, MANCH_F ]
+            $ref: /schemas/types.yaml#/definitions/non-unique-string-array
+
+          st,adc-channel-clk-src:
+            description: |
+              Conversion clock source.
+              - "CLKIN": external SPI clock (CLKIN x)
+              - "CLKOUT": internal SPI clock (CLKOUT) (default)
+              - "CLKOUT_F": internal SPI clock divided by 2 (falling edge).
+              - "CLKOUT_R": internal SPI clock divided by 2 (rising edge).
+            items:
+              enum: [ CLKIN, CLKOUT, CLKOUT_F, CLKOUT_R ]
+            $ref: /schemas/types.yaml#/definitions/non-unique-string-array
+
+          st,adc-alt-channel:
+            description:
+              Must be defined if two sigma delta modulators are
+              connected on same SPI input.
+              If not set, channel n is connected to SPI input n.
+              If set, channel n is connected to SPI input n + 1.
+            type: boolean
+
+          io-backends:
+            description: |
+              phandle to an external sigma delta modulator or internal ADC output.
+            $ref: /schemas/types.yaml#/definitions/phandle
+
+        required:
+          - reg
+          - io-backends
+
+        additionalProperties: false
+
     required:
       - compatible
       - reg
       - interrupts
-      - st,adc-channels
-      - st,adc-channel-names
       - st,filter-order
-      - "#io-channel-cells"
 
     allOf:
       - if:
@@ -175,14 +188,6 @@  patternProperties:
 
         then:
           properties:
-            st,adc-channels:
-              minItems: 1
-              maxItems: 8
-
-            st,adc-channel-names:
-              minItems: 1
-              maxItems: 8
-
             st,adc-channel-types:
               minItems: 1
               maxItems: 8
@@ -191,14 +196,6 @@  patternProperties:
               minItems: 1
               maxItems: 8
 
-            io-channels:
-              description:
-                From common IIO binding. Used to pipe external sigma delta
-                modulator or internal ADC output to DFSDM channel.
-
-          required:
-            - io-channels
-
       - if:
           properties:
             compatible:
@@ -207,12 +204,6 @@  patternProperties:
 
         then:
           properties:
-            st,adc-channels:
-              maxItems: 1
-
-            st,adc-channel-names:
-              maxItems: 1
-
             st,adc-channel-types:
               maxItems: 1
 
@@ -237,15 +228,9 @@  patternProperties:
                 "#sound-dai-cells":
                   const: 0
 
-                io-channels:
-                  description:
-                    From common IIO binding. Used to pipe external sigma delta
-                    modulator or internal ADC output to DFSDM channel.
-
               required:
                 - compatible
                 - "#sound-dai-cells"
-                - io-channels
 
 allOf:
   - if:
@@ -278,52 +263,4 @@  allOf:
                 minimum: 0
                 maximum: 5
 
-examples:
-  - |
-    #include <dt-bindings/interrupt-controller/arm-gic.h>
-    #include <dt-bindings/clock/stm32mp1-clks.h>
-    dfsdm: dfsdm@4400d000 {
-      compatible = "st,stm32mp1-dfsdm";
-      reg = <0x4400d000 0x800>;
-      clocks = <&rcc DFSDM_K>, <&rcc ADFSDM_K>;
-      clock-names = "dfsdm", "audio";
-      #address-cells = <1>;
-      #size-cells = <0>;
-
-      dfsdm0: filter@0 {
-        compatible = "st,stm32-dfsdm-dmic";
-        reg = <0>;
-        interrupts = <GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH>;
-        dmas = <&dmamux1 101 0x400 0x01>;
-        dma-names = "rx";
-        #io-channel-cells = <1>;
-        st,adc-channels = <1>;
-        st,adc-channel-names = "dmic0";
-        st,adc-channel-types = "SPI_R";
-        st,adc-channel-clk-src = "CLKOUT";
-        st,filter-order = <5>;
-
-        asoc_pdm0: dfsdm-dai {
-          compatible = "st,stm32h7-dfsdm-dai";
-          #sound-dai-cells = <0>;
-          io-channels = <&dfsdm0 0>;
-        };
-      };
-
-      dfsdm_pdm1: filter@1 {
-        compatible = "st,stm32-dfsdm-adc";
-        reg = <1>;
-        interrupts = <GIC_SPI 111 IRQ_TYPE_LEVEL_HIGH>;
-        dmas = <&dmamux1 102 0x400 0x01>;
-        dma-names = "rx";
-        #io-channel-cells = <1>;
-        st,adc-channels = <2 3>;
-        st,adc-channel-names = "in2", "in3";
-        st,adc-channel-types = "SPI_R", "SPI_R";
-        st,adc-channel-clk-src = "CLKOUT_F", "CLKOUT_F";
-        io-channels = <&sd_adc2 &sd_adc3>;
-        st,filter-order = <1>;
-      };
-    };
-
 ...