Re: [PATCH 1/2] dt-bindings: leds: Add Allwinner R329/D1 LED controller

[Maxime Ripard]

Hi,

On Thu, Sep 02, 2021 at 06:42:27PM -0500, Samuel Holland wrote:
> The Allwinner R329 and D1 SoCs contain an LED controller designed to
> drive a series of RGB LED pixels. It supports PIO and DMA transfers, and
> has configurable timing and pixel format.
> 
> Signed-off-by: Samuel Holland <samuel@xxxxxxxxxxxx>
> ---
>  .../leds/allwinner,sun50i-r329-ledc.yaml      | 141 ++++++++++++++++++
>  1 file changed, 141 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/allwinner,sun50i-r329-ledc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/leds/allwinner,sun50i-r329-ledc.yaml b/Documentation/devicetree/bindings/leds/allwinner,sun50i-r329-ledc.yaml
> new file mode 100644
> index 000000000000..bf883944e911
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/allwinner,sun50i-r329-ledc.yaml
> @@ -0,0 +1,141 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/allwinner,sun50i-r329-ledc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Allwinner sunxi LED Controller Bindings

sunxi is ambiguous, it implies that it works with every Allwinner SoC,
but actually supports only one. Please mention R329 everywhere you used
sunxi.

> +
> +maintainers:
> +  - Samuel Holland <samuel@xxxxxxxxxxxx>
> +
> +description:
> +  The LED controller found in Allwinner sunxi SoCs uses a one-wire serial
> +  interface to drive up to 1024 RGB LEDs.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - const: allwinner,sun50i-r329-ledc
> +      - items:
> +          - enum:
> +              - allwinner,sun20i-d1-ledc
> +          - const: allwinner,sun50i-r329-ledc
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +  clocks:
> +    items:
> +      - description: Bus clock
> +      - description: Module clock
> +
> +  clock-names:
> +    items:
> +      - const: bus
> +      - const: mod
> +
> +  resets:
> +    maxItems: 1
> +
> +  dmas:
> +    items:
> +      - description: TX DMA channel
> +
> +  dma-names:
> +    items:
> +      - const: tx

You don't need the items: here since you have a single item.

> +  interrupts:
> +    maxItems: 1
> +
> +  vled-supply:
> +    description: Regulator supplying power to external LEDs
> +
> +  format:
> +    description: Pixel format (subpixel transmission order), default is "grb"
> +    enum:
> +      - "bgr"
> +      - "brg"
> +      - "gbr"
> +      - "grb"
> +      - "rbg"
> +      - "rgb"
> +
> +  t0h-ns:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Length of high pulse when transmitting a "0" bit

Every property with an -ns suffix is already a uint32 here:

https://github.com/devicetree-org/dt-schema/blob/master/schemas/property-units.yaml#L54

Just make sure you have a single item

Looks good otherwise, thanks

Maxime

> +  t0l-ns:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Length of low pulse when transmitting a "0" bit
> +
> +  t1h-ns:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Length of high pulse when transmitting a "1" bit
> +
> +  t1h-ns:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Length of low pulse when transmitting a "1" bit
> +
> +  treset-ns:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Minimum delay between transmission frames
> +
> +patternProperties:
> +  "^multi-led@[0-9a-f]+$":
> +    type: object
> +    $ref: leds-class-multicolor.yaml#
> +    properties:
> +      reg:
> +        minimum: 0
> +        maximum: 1023
> +        description: Index of the LED in the series (must be contiguous)
> +
> +    required:
> +      - reg
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - resets
> +  - dmas
> +  - dma-names
> +  - interrupts
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/leds/common.h>
> +
> +    ledc: led-controller@2008000 {
> +      compatible = "allwinner,sun20i-d1-ledc",
> +                   "allwinner,sun50i-r329-ledc";
> +      reg = <0x2008000 0x400>;
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +      clocks = <&ccu 12>, <&ccu 34>;
> +      clock-names = "bus", "mod";
> +      resets = <&ccu 12>;
> +      dmas = <&dma 42>;
> +      dma-names = "tx";
> +      interrupts = <36 IRQ_TYPE_LEVEL_HIGH>;
> +
> +      multi-led@0 {
> +        reg = <0x0>;
> +        color = <LED_COLOR_ID_RGB>;
> +        function = LED_FUNCTION_INDICATOR;
> +      };
> +    };
> +
> +...
> -- 
> 2.31.1
>

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