linux-kernel - Re: [PATCH v2 1/2] dt-binding: leds: Document leds-multi-gpio bindings

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Date:   Sat, 27 Mar 2021 12:12:22 -0600
From:   Rob Herring <robh@...nel.org>
To:     Hermes Zhang <chenhui.zhang@...s.com>
Cc:     pavel@....cz, dmurphy@...com, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        chenhuiz@...s.com, lkml@...s.com, kernel@...s.com
Subject: Re: [PATCH v2 1/2] dt-binding: leds: Document leds-multi-gpio
 bindings

On Fri, Mar 26, 2021 at 01:28:00PM +0800, Hermes Zhang wrote:
> From: Hermes Zhang <chenhuiz@...s.com>
> 
> This binding represents LED devices which are controller with
> multiple GPIO lines in order to achieve more than two brightness
> states.
> 
> Signed-off-by: Hermes Zhang <chenhuiz@...s.com>
> ---
>  .../bindings/leds/leds-multi-gpio.yaml        | 50 +++++++++++++++++++
>  1 file changed, 50 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/leds-multi-gpio.yaml
> 
> diff --git a/Documentation/devicetree/bindings/leds/leds-multi-gpio.yaml b/Documentation/devicetree/bindings/leds/leds-multi-gpio.yaml
> new file mode 100644
> index 000000000000..1549f21e8d6e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-multi-gpio.yaml
> @@ -0,0 +1,50 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/leds-multi-gpio.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Multiple GPIOs LED driver
> +
> +maintainers:
> +  - Hermes Zhang <chenhuiz@...s.com>
> +
> +description:
> +  This will support some LED made of multiple GPIOs and the brightness of the
> +  LED could map to different states of the GPIOs.
> +
> +properties:
> +  compatible:
> +    const: multi-gpio-led
> +
> +  led-gpios:
> +    description: Array of one or more GPIOs pins used to control the LED.
> +    minItems: 1
> +    maxItems: 8  # Should be enough
> +
> +  led-states:
> +    description: |
> +      The array list the supported states here which will map to brightness
> +      from 0 to maximum. Each item in the array will present all the GPIOs
> +      value by bit.
> +    $ref: /schemas/types.yaml#/definitions/uint8-array
> +    minItems: 1
> +    maxItems: 256 # Should be enough

Isn't this the same as the standard 'brightness-levels' from backlight 
binding? The index is the level and the value is the h/w specific 
setting.

> +
> +required:
> +  - compatible
> +  - led-gpios
> +  - led-states
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    gpios-led {
> +      compatible = "multi-gpio-led";
> +
> +      led-gpios = <&gpio0 23 0x1>,
> +                  <&gpio0 24 0x1>;
> +      led-states = /bits/ 8 <0x00 0x01 0x02 0x03>;
> +    };
> +...
> -- 
> 2.20.1
>