linux-kernel - Re: [PATCH 2/2] dt: bindings: lp55xx: Add predefined LED pattern

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Date:   Wed, 12 May 2021 21:20:36 -0500
From:   Rob Herring <robh@...nel.org>
To:     Doug Zobel <dougdev334@...il.com>
Cc:     Pavel Machek <pavel@....cz>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] dt: bindings: lp55xx: Add predefined LED pattern

On Tue, May 11, 2021 at 03:48:34PM -0500, Doug Zobel wrote:
> Add a new device tree object for LP5562 predfined led patterns.

If you are going to define something generic looking, put it in a 
generic binding.

I don't know that this belongs in DT though. Won't a user want to create 
their own patterns? That means there should be a sysfs interface (which 
we either already have or has been attempted IIRC).

> 
> Signed-off-by: Doug Zobel <dougdev334@...il.com>
> ---
>  .../devicetree/bindings/leds/leds-lp55xx.yaml | 103 +++++++++++++++++-
>  1 file changed, 102 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/leds/leds-lp55xx.yaml b/Documentation/devicetree/bindings/leds/leds-lp55xx.yaml
> index f552cd143d5b..2524a84fe688 100644
> --- a/Documentation/devicetree/bindings/leds/leds-lp55xx.yaml
> +++ b/Documentation/devicetree/bindings/leds/leds-lp55xx.yaml
> @@ -100,6 +100,31 @@ patternProperties:
>          $ref: /schemas/types.yaml#/definitions/string
>          description: name of channel
>  
> +  "(^pattern@[0-9a-f]$|pattern)":
> +    type: object
> +    $ref: common.yaml#
> +    description: |
> +      LP5562 sepcific object.  LED pattern program saved to and run on LP5562.
> +    properties:
> +      pat-name:
> +        $ref: /schemas/types.yaml#/definitions/string
> +        description: Name of pattern program
> +
> +      pat-r:
> +        $ref: /schemas/types.yaml#/definitions/uint8-array
> +        description: |
> +          Program data for red channel.  See LP5562 datasheet for program format specification.
> +
> +      pat-g:
> +        $ref: /schemas/types.yaml#/definitions/uint8-array
> +        description: |
> +          Program data for green channel.  See LP5562 datasheet for program format specification.
> +
> +      pat-b:
> +        $ref: /schemas/types.yaml#/definitions/uint8-array
> +        description: |
> +          Program data for blue channel.  See LP5562 datasheet for program format specification.
> +
>  required:
>    - compatible
>    - reg
> @@ -223,6 +248,82 @@ examples:
>                 };
>              };
>          };
> -    };
>  
> +        led-controller@30 {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +            compatible = "ti,lp5562";
> +            reg = <0x30>;
> +
> +            led@0 {
> +                reg = <0>;
> +                chan-name = "red";
> +                color = <LED_COLOR_ID_RED>;
> +            };
> +
> +            led@1 {
> +                reg = <1>;
> +                chan-name = "green";
> +                color = <LED_COLOR_ID_GREEN>;
> +            };
> +
> +            led@2 {
> +                reg = <2>;
> +                chan-name = "blue";
> +                color = <LED_COLOR_ID_BLUE>;
> +            };
> +
> +            pattern@1 {
> +                /* Pulsing blue pattern
> +                 *   Blue:
> +                 *     027F: Ramp up 50%
> +                 *     027F: Ramp up 50%
> +                 *     4600: Wait 100ms
> +                 *     02FF: Ramp down 50%
> +                 *     02FF: Ramp down 50%
> +                 *     4600: Wait 100ms
> +                 *     0000: Goto start
> +                 */
> +                pat-name = "Pulsing Blue";
> +                pat-b = [02 7f 02 7f 46 00 02 ff 02 ff 46 00 00 00];
> +            };
> +
> +            pattern@2 {
> +                /*
> +                 * HSV rainbow
> +                 *   Red:
> +                 *     40FF: Set PWM 255
> +                 *     41FF: Ramp down 50%
> +                 *     41FF: Ramp down 50%
> +                 *     41FF: Wait 1/2 ramp time
> +                 *     41FF: Wait 1/2 ramp time
> +                 *     417F: Ramp up 50%
> +                 *     417F: Ramp up 50%
> +                 *     0000: Goto start
> +                 *   Green:
> +                 *     4000: Set PWM 0
> +                 *     417F: Ramp up 50%
> +                 *     417F: Ramp up 50%
> +                 *     41FF: Ramp down 50%
> +                 *     41FF: Ramp down 50%
> +                 *     41FF: Wait 1/2 ramp time
> +                 *     41FF: Wait 1/2 ramp time
> +                 *     0000: Goto start
> +                 *   Blue:
> +                 *     4000: Set PWM 0
> +                 *     41FF: Wait 1/2 ramp time
> +                 *     41FF: Wait 1/2 ramp time
> +                 *     417F: Ramp up 50%
> +                 *     417F: Ramp up 50%
> +                 *     41FF: Ramp down 50%
> +                 *     41FF: Ramp down 50%
> +                 *     0000: Goto start
> +                 */
> +                pat-name = "HSV Rainbow";
> +                pat-r = [40 ff 41 FF 41 FF 41 FF 41 FF 41 7F 41 7F 00 00];
> +                pat-g = [40 00 41 7F 41 7F 41 FF 41 FF 41 FF 41 FF 00 00];
> +                pat-b = [40 00 41 FF 41 FF 41 7F 41 7F 41 FF 41 FF 00 00];
> +            };
> +        };
> +    };
>  ...
> -- 
> 2.20.1
>