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

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Message-ID: <eb043379-bb33-096a-d7b0-f333d00554dd@traphandler.com>
Date:   Mon, 23 May 2022 15:07:13 +0200
From:   Jean-Jacques Hiblot <jjhiblot@...phandler.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        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 12:14, Krzysztof Kozlowski wrote:
> 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.

Thanks for the review. I didn't know about dt_binding_check.

I'll make sure it passes next time.

JJ

>> ---
>> 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