[PATCH 2/3 v3] dt-bindings: backlight: Add Kinetic KTD253 bindings

[Daniel Thompson]

On Wed, Aug 19, 2020 at 10:51:49PM +0200, Linus Walleij wrote:
> This adds device tree bindings for the Kinetic KTD253
> white LED backlight driver.
> 
> Cc: devicetree at vger.kernel.org
> Cc: Sam Ravnborg <sam at ravnborg.org>
> Signed-off-by: Linus Walleij <linus.walleij at linaro.org>

Reviewed-by: Daniel Thompson <daniel.thompson at linaro.org>


> ---
> ChangeLog v2->v3:
> - Drop the pointless cargo-culted "default-on" property that
>   we were not using
> - Correct the brightness in the example to something legal (13)
> ChangeLog v1->v2:
> - Create common.yaml for backlight as suggested by Sam and
>   use that.
> - Rename the GPIO line "enable-gpios"
> ---
>  .../leds/backlight/kinetic,ktd253.yaml        | 46 +++++++++++++++++++
>  1 file changed, 46 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/backlight/kinetic,ktd253.yaml
> 
> diff --git a/Documentation/devicetree/bindings/leds/backlight/kinetic,ktd253.yaml b/Documentation/devicetree/bindings/leds/backlight/kinetic,ktd253.yaml
> new file mode 100644
> index 000000000000..7a6ec1f8c0f3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/backlight/kinetic,ktd253.yaml
> @@ -0,0 +1,46 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/backlight/kinetic,ktd253.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Kinetic Technologies KTD253 one-wire backlight
> +
> +maintainers:
> +  - Linus Walleij <linus.walleij at linaro.org>
> +
> +description: |
> +  The Kinetic Technologies KTD253 is a white LED backlight that is
> +  controlled by a single GPIO line. If you just turn on the backlight
> +  it goes to maximum backlight then you can set the level of backlight
> +  using pulses on the enable wire. This is sometimes referred to as
> +  "expresswire".
> +
> +allOf:
> +  - $ref: common.yaml#
> +
> +properties:
> +  compatible:
> +    const: kinetic,ktd253
> +
> +  enable-gpios:
> +    description: GPIO to use to enable/disable and dim the backlight.
> +    maxItems: 1
> +
> +  default-brightness: true
> +  max-brightness: true
> +
> +required:
> +  - compatible
> +  - enable-gpios
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    backlight {
> +        compatible = "kinetic,ktd253";
> +        enable-gpios = <&gpio2 5 GPIO_ACTIVE_HIGH>;
> +        default-brightness = <13>;
> +    };
> -- 
> 2.26.2
>