Re: [PATCH v6 1/4] dt-bindings: leds: Add Qualcomm Light Pulse Generator binding

[Rob Herring <robh@kernel.org>]

On Wed, Oct 21, 2020 at 01:12:21PM -0700, Bjorn Andersson wrote:
> This adds the binding document describing the three hardware blocks
> related to the Light Pulse Generator found in a wide range of Qualcomm
> PMICs.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
> 
> Changes since v5:
> - None
> 
>  .../bindings/leds/leds-qcom-lpg.yaml          | 170 ++++++++++++++++++
>  1 file changed, 170 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml
> 
> diff --git a/Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml b/Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml
> new file mode 100644
> index 000000000000..5ccf0f3d8f1b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml
> @@ -0,0 +1,170 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/leds-qcom-lpg.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm Light Pulse Generator
> +
> +maintainers:
> +  - Bjorn Andersson <bjorn.andersson@linaro.org>
> +
> +description: >
> +  The Qualcomm Light Pulse Generator consists of three different hardware blocks;
> +  a ramp generator with lookup table, the light pulse generator and a three
> +  channel current sink. These blocks are found in a wide range of Qualcomm PMICs.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - qcom,pm8916-pwm

Are the LED properties valid when PWM is used/enabled? The schema 
suggests yes, the example suggests no. If not, I think this should be 2 
schema docs.

> +      - qcom,pm8941-lpg
> +      - qcom,pm8994-lpg
> +      - qcom,pmi8994-lpg
> +      - qcom,pmi8998-lpg
> +
> +  "#pwm-cells":
> +    const: 2
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +  qcom,power-source:
> +    $ref: /schemas/types.yaml#definitions/uint32

led-sources can't be made to work for this?

> +    description: >
> +      power-source used to drive the output, as defined in the datasheet.
> +      Should be specified if the TRILED block is present
> +    enum:
> +      - 0
> +      - 1
> +      - 3
> +
> +  multi-led:
> +    type: object
> +    $ref: leds-class-multicolor.yaml#
> +    properties:
> +      "#address-cells":
> +        const: 1
> +
> +      "#size-cells":
> +        const: 0
> +
> +      "^led@[0-9a-f]$":
> +        type: object
> +        $ref: common.yaml#
> +
> +        properties:
> +          "qcom,dtest":

Don't need quotes.

> +            $ref: /schemas/types.yaml#definitions/uint32-array

The description sounds like a matrix rather than an array.

> +            description: >
> +              configures the output into an internal test line of the pmic. Specified
> +              by a list of u32 pairs, one pair per channel, where each pair denotes the
> +              test line to drive and the second configures how the value should be
> +              outputed, as defined in the datasheet
> +            minItems: 2
> +            maxItems: 2

If so, then you'd want:

items:
  minItems: 2
  maxItems: 2

> +
> +        required:
> +          - reg
> +
> +patternProperties:
> +  "^led@[0-9a-f]$":
> +    type: object
> +    $ref: common.yaml#
> +    properties:
> +      "qcom,dtest":
> +        $ref: /schemas/types.yaml#definitions/uint32-array
> +        description: >
> +          configures the output into an internal test line of the pmic. Specified
> +          by a list of u32 pairs, one pair per channel, where each pair denotes the
> +          test line to drive and the second configures how the value should be
> +          outputed, as defined in the datasheet
> +        minItems: 2
> +        maxItems: 2
> +
> +    required:
> +      - reg
> +
> +required:
> +  - compatible
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/leds/common.h>
> +
> +    lpg {
> +      compatible = "qcom,pmi8994-lpg";
> +
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      qcom,power-source = <1>;
> +
> +      led@1 {
> +        reg = <1>;
> +        label = "green:user1";
> +      };
> +
> +      led@2 {
> +        reg = <2>;
> +        label = "green:user0";
> +        default-state = "on";
> +      };
> +
> +      led@3 {
> +        reg = <3>;
> +        label = "green:user2";
> +      };
> +
> +      led@4 {
> +        reg = <4>;
> +        label = "green:user3";
> +
> +        qcom,dtest = <4 1>;
> +      };
> +    };
> +  - |
> +    #include <dt-bindings/leds/common.h>
> +
> +    lpg {
> +      compatible = "qcom,pmi8994-lpg";
> +
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      qcom,power-source = <1>;
> +
> +      multi-led {
> +        color = <LED_COLOR_ID_MULTI>;
> +        label = "rgb:notification";
> +
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        led@1 {
> +          reg = <1>;
> +          color = <LED_COLOR_ID_RED>;
> +        };
> +
> +        led@2 {
> +          reg = <2>;
> +          color = <LED_COLOR_ID_GREEN>;
> +        };
> +
> +        led@3 {
> +          reg = <3>;
> +          color = <LED_COLOR_ID_BLUE>;
> +        };
> +      };
> +    };
> +  - |
> +    lpg {
> +      compatible = "qcom,pm8916-pwm";
> +      #pwm-cells = <2>;
> +    };
> +...
> -- 
> 2.28.0
>