linux-kernel - Re: [PATCH V4 3/4] backlight: qcom-wled: Add WLED5 bindings

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Date:   Wed, 25 Mar 2020 15:37:16 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Kiran Gunda <kgunda@...eaurora.org>
Cc:     bjorn.andersson@...aro.org, jingoohan1@...il.com,
        lee.jones@...aro.org, b.zolnierkie@...sung.com,
        dri-devel@...ts.freedesktop.org, jacek.anaszewski@...il.com,
        pavel@....cz, robh+dt@...nel.org, mark.rutland@....com,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Dan Murphy <dmurphy@...com>,
        linux-arm-msm@...r.kernel.org,
        Subbaraman Narayanamurthy <subbaram@...eaurora.org>
Subject: Re: [PATCH V4 3/4] backlight: qcom-wled: Add WLED5 bindings

On Mon, Mar 23, 2020 at 11:16:57PM +0530, Kiran Gunda wrote:
> Add WLED5 specific bindings.
> 
> Signed-off-by: Kiran Gunda <kgunda@...eaurora.org>
> Signed-off-by: Subbaraman Narayanamurthy <subbaram@...eaurora.org>
> ---
>  .../bindings/leds/backlight/qcom-wled.yaml         | 39 ++++++++++++++++++++++
>  1 file changed, 39 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.yaml b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.yaml
> index 8a388bf..159115f 100644
> --- a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.yaml
> +++ b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.yaml
> @@ -20,6 +20,7 @@ properties:
>         - qcom,pm8941-wled
>         - qcom,pmi8998-wled
>         - qcom,pm660l-wled
> +       - qcom,pm8150l-wled
>  
>    reg:
>      maxItems: 1
> @@ -28,10 +29,23 @@ properties:
>      maxItems: 1
>      description:
>        brightness value on boot, value from 0-4095.
> +      For pm8150l this value vary from 0-4095 or 0-32767
> +      depending on the brightness control mode. If CABC is
> +      enabled 0-4095 range is used.

I rather dislike some of the property descriptions using PMIC version
numbers to distinguish between peripheral versions and others using
WLEDx version numbers.

Could the property description be rephrased to use WLED3/4/5 terminology
instead?


>      allOf:
>        - $ref: /schemas/types.yaml#/definitions/uint32
>          default: 2048
>  
> +  max-brightness:
> +    maxItems: 1
> +    description:
> +      Maximum brightness level. Allowed values are,
> +      for pmi8998 it is  0-4095.
> +      For pm8150l, this can be either 4095 or 32767.
> +      If CABC is enabled, this is capped to 4095.
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/uint32
> +

Similar thing here, is PMI8998 simply a synonym for WLED4 or there
something special about the PMIC versioning that requires it to be used?


Daniel.


>    label:
>      maxItems: 1
>      description:
> @@ -124,6 +138,31 @@ properties:
>        value for PM8941 from 1 to 3. Default 2
>        For PMI8998 from 1 to 4.
>  
> +  qcom,modulator-sel:
> +    maxItems: 1
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      Selects the modulator used for brightness modulation.
> +      Allowed values are,
> +               0 - Modulator A
> +               1 - Modulator B
> +      If not specified, then modulator A will be used by default.
> +      This property is applicable only to WLED5 peripheral.
> +
> +  qcom,cabc-sel:
> +    maxItems: 1
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      Selects the CABC pin signal used for brightness modulation.
> +      Allowed values are,
> +              0 - CABC disabled
> +              1 - CABC 1
> +              2 - CABC 2
> +              3 - External signal (e.g. LPG) is used for dimming
> +      This property is applicable only to WLED5 peripheral.
> +
>    interrupts:
>      maxItems: 2
>      description:
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
>  a Linux Foundation Collaborative Project