[v3,1/5] dt-bindings: leds: Add binding for qcom-spmi-flash

Add devicetree binding for Qualcomm's SPMI Flash LEDs which are part of
the PM8941 PMIC. These LEDs are used both as lantern and camera flash on
phones based on the MSM8974 SoC, like the Nexus 5.

Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
---

Changes in v3:
- Removed clamp-curr, headroom, startup-dly and safety-timer properties since
  they didn't impact the behavior. They're now hardcoded in the driver (patch 2)
- Added valid ranges for led-max-microamp, flash-max-microamp and
  flash-max-timeout-us
- Removed dt-bindings header file that held some constants (moved to inside the
  driver in patch 2)

Added in v2

 .../bindings/leds/leds-qcom-spmi-flash.yaml   | 93 +++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/leds-qcom-spmi-flash.yaml

On Tue, Aug 03, 2021 at 01:26:37PM -0300, Nícolas F. R. A. Prado wrote:
> Add devicetree binding for Qualcomm's SPMI Flash LEDs which are part of
> the PM8941 PMIC. These LEDs are used both as lantern and camera flash on
> phones based on the MSM8974 SoC, like the Nexus 5.
> 
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
> ---
> 
> Changes in v3:
> - Removed clamp-curr, headroom, startup-dly and safety-timer properties since
>   they didn't impact the behavior. They're now hardcoded in the driver (patch 2)
> - Added valid ranges for led-max-microamp, flash-max-microamp and
>   flash-max-timeout-us
> - Removed dt-bindings header file that held some constants (moved to inside the
>   driver in patch 2)
> 
> Added in v2
> 
>  .../bindings/leds/leds-qcom-spmi-flash.yaml   | 93 +++++++++++++++++++
>  1 file changed, 93 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/leds-qcom-spmi-flash.yaml
> 
> diff --git a/Documentation/devicetree/bindings/leds/leds-qcom-spmi-flash.yaml b/Documentation/devicetree/bindings/leds/leds-qcom-spmi-flash.yaml
> new file mode 100644
> index 000000000000..da674d73c033
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-qcom-spmi-flash.yaml
> @@ -0,0 +1,93 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/leds-qcom-spmi-flash.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm SPMI Flash LEDs
> +
> +maintainers:
> +  - Nícolas F. R. A. Prado <n@nfraprado.net>
> +
> +description: |
> +  The Qualcomm SPMI Flash LEDs are part of Qualcomm PMICs and are used primarily
> +  as a camera or video flash. They can also be used as a lantern when on torch
> +  mode.
> +  The PMIC is connected to Host processor via SPMI bus.
> +
> +properties:
> +  compatible:
> +    const: qcom,spmi-flash-leds
> +
> +  reg:
> +    maxItems: 1
> +
> +  flash-boost-supply:
> +    description: SMBB regulator for LED flash mode
> +
> +  torch-boost-supply:
> +    description: SMBB regulator for LED torch mode
> +
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 0
> +
> +patternProperties:
> +  "^led@[0-1]$":
> +    type: object
> +    $ref: common.yaml#
> +
> +    properties:
> +      reg:
> +        maxItems: 1

Instead of maxItems, this would be a bit more specific:

enum: [ 0, 1 ]

With that,

Reviewed-by: Rob Herring <robh@kernel.org>

> +
> +      led-max-microamp:
> +        minimum: 12500
> +        maximum: 200000
> +        multipleOf: 12500
> +
> +      flash-max-microamp:
> +        minimum: 12500
> +        maximum: 1000000
> +        multipleOf: 12500
> +
> +      flash-max-timeout-us:
> +        minimum: 10000
> +        maximum: 1280000
> +        multipleOf: 10000
> +
> +    required:
> +      - reg
> +
> +required:
> +  - compatible
> +  - reg
> +  - flash-boost-supply
> +  - torch-boost-supply
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/leds/common.h>
> +
> +    spmi-flash-leds@d300 {
> +        compatible = "qcom,spmi-flash-leds";
> +        reg = <0xd300 0x100>;
> +        flash-boost-supply = <&pm8941_5vs1>;
> +        torch-boost-supply = <&pm8941_5v>;
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        led@0 {
> +            reg = <0>;
> +            function = LED_FUNCTION_FLASH;
> +            color = <LED_COLOR_ID_WHITE>;
> +            led-max-microamp = <200000>;
> +            flash-max-microamp = <1000000>;
> +            flash-max-timeout-us = <1280000>;
> +        };
> +    };
> +...
> -- 
> 2.32.0
> 
>