linux-kernel - Re: [PATCH v5 1/3] dt-bindings: leds: Add bindings for the TLC5925 controller

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Date:   Fri, 17 Jun 2022 17:19:49 -0600
From:   Rob Herring <robh@...nel.org>
To:     Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Cc:     pavel@....cz, krzk+dt@...nel.org, andy.shevchenko@...il.com,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/3] dt-bindings: leds: Add bindings for the TLC5925
 controller

On Tue, Jun 14, 2022 at 05:42:43PM +0200, Jean-Jacques Hiblot wrote:
> Add bindings documentation for the TLC5925 LED controller.
> 
> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...phandler.com>
> ---
>  .../devicetree/bindings/leds/ti,tlc5925.yaml  | 107 ++++++++++++++++++
>  1 file changed, 107 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/ti,tlc5925.yaml
> 
> diff --git a/Documentation/devicetree/bindings/leds/ti,tlc5925.yaml b/Documentation/devicetree/bindings/leds/ti,tlc5925.yaml
> new file mode 100644
> index 000000000000..12a71e48f854
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/ti,tlc5925.yaml
> @@ -0,0 +1,107 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/ti,tlc5925.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: LEDs connected to TI TLC5925 controller
> +
> +maintainers:
> +  - Jean-Jacques Hiblot <jjhiblot@...phandler.com>
> +
> +description: |
> +  The TLC5925 is a low-power 16-channel constant-current LED sink driver.
> +  It is controlled through a SPI interface.
> +  It is built around a shift register and latches which convert serial
> +  input data into a parallel output. Several TLC5925 can be chained to
> +  control more than 16 LEDs with a single chip-select.
> +  The brightness level cannot be controlled, each LED is either on or off.
> +
> +  Each LED is represented as a sub-node of the ti,tlc5925 device.
> +
> +$ref: /schemas/spi/spi-peripheral-props.yaml#
> +
> +properties:
> +  compatible:
> +    const: ti,tlc5925
> +
> +  ti,shift-register-length:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    minimum: 8
> +    description: |

Don't need '|' if no formatting to preserve.

> +      The length of the shift register. If several TLC5925 are chained,
> +      shift_register_length should be set to 16 times the number of TLC5925.
> +      The value must be a multiple of 8.

multipleOf: 8

Though I'm confused why it's not 16.

> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +  output-enable-b-gpios:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array

Already has a type.

> +    description: |
> +      Optional GPIO pins to enable/disable the parallel output. They describe
> +      the GPIOs connected to the OE/ pin of the TLC5925s.
> +
> +patternProperties:
> +  "@[0-9a-f]+$":
> +    type: object
> +    $ref: common.yaml#

       unevaluatedProperties: false

> +
> +    properties:
> +      reg:
> +        $ref: /schemas/types.yaml#/definitions/uint32

Don't need a type here.

> +        description: |
> +          LED pin number (must be lower than ti,shift-register-length).
> +          The furthest LED down the chain has the pin number 0.
> +
> +    required:
> +      - reg
> +
> +required:
> +  - "#address-cells"
> +  - "#size-cells"
> +  - ti,shift-register-length

Is there not a default when not chained? 

> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/leds/common.h>
> +
> +    spi0 {

spi {

> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        leds@2 {
> +            compatible = "ti,tlc5925";
> +            reg = <0x02>;
> +            spi-max-frequency = <30000000>;
> +            ti,shift-register-length = <32>;
> +            output-enable-b-gpios = <&gpio0b 9 GPIO_ACTIVE_HIGH>, <&gpio0b 7 GPIO_ACTIVE_HIGH>;
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            led@0 {
> +                reg = <0>;
> +                function = LED_FUNCTION_STATUS;
> +                color = <LED_COLOR_ID_GREEN>;
> +            };
> +
> +            led@4 {
> +                reg = <4>;
> +                function = LED_FUNCTION_STATUS;
> +                color = <LED_COLOR_ID_RED>;
> +            };
> +
> +            led@1f {
> +                reg = <31>;
> +                function = LED_FUNCTION_PANIC;
> +                color = <LED_COLOR_ID_RED>;
> +            };
> +        };
> +
> +    };
> -- 
> 2.25.1
> 
>