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

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Date:   Mon, 23 May 2022 12:14:44 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Jean-Jacques Hiblot <jjhiblot@...phandler.com>,
        Pavel Machek <pavel@....cz>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>
Cc:     linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: leds: Add bindings for the TLC5925
 controller

On 23/05/2022 10:49, Jean-Jacques Hiblot wrote:
> Add bindings documentation for the TLC5925 LED controller.
> 
> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...phandler.com>

Thank you for your patch. There is something to discuss/improve.

> ---
> devicetree@...r.kernel.org
>  .../bindings/leds/leds-tlc5925.yaml           | 100 ++++++++++++++++++
>  1 file changed, 100 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/leds-tlc5925.yaml
> 
> diff --git a/Documentation/devicetree/bindings/leds/leds-tlc5925.yaml b/Documentation/devicetree/bindings/leds/leds-tlc5925.yaml
> new file mode 100644
> index 000000000000..156db599d5a1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-tlc5925.yaml

Filename: vendor,device
so "ti,tlc5925-leds.yaml" for example.



> @@ -0,0 +1,100 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/leds-tlc5925.yaml#
> +$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.
> +
> +properties:
> +  compatible:
> +    const: ti,tlc5925
> +
> +  shift_register_length:
> +    maxItems: 1

No...
1. Did you test your bindings with dt_binding_check? This fails
obviously... please, do not send untested bindings.

2. vendor prefix, no underscores, proper type, maxItems look wrong here

> +    description: |
> +      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.
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +  output-enable-b-gpios:
> +    description: |
> +      GPIO pins to enable/disable the parallel output. They describe the GPIOs
> +      connected to the OE/ pin of the TLC5925s.

maxItems


> +
> +patternProperties:
> +  "@[a-f0-9]+$":

How many LEDs you can have here? Usually it is limited, so the pattern
should be narrowed.

> +    type: object
> +
> +    $ref: common.yaml#
> +
> +    properties:
> +      reg:
> +        items:

Not correct syntax... I will stop reviewing. There is no point to use
reviewers time to do the job of a tool.


> +examples:
> +  - |
> +    &spi0 {
> +        leds@2 {
> +                compatible = "ti,tlc5925";

Messed up indentation. 4 spaces for DTS example.

> +                reg = <0x02>;
> +                spi-max-frequency = <30000000>;
> +                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-satus@0 {
> +                        reg = <0>;
> +                        function = LED_FUNCTION_STATUS;
> +                        color = <LED_COLOR_ID_GREEN>;
> +                };
> +
> +                led-satus@4 {
> +                        reg = <4>;
> +                        function = LED_FUNCTION_STATUS;
> +                        color = <LED_COLOR_ID_RED>;
> +                };
> +
> +                led-alive@24 {
> +                        reg = <24>;
> +                        label = "green:alive"
> +                };
> +
> +                led-panic@31 {
> +                        reg = <31>;
> +                        label = "red:panic"
> +                };
> +        };
> +    };


Best regards,
Krzysztof