linux-kernel - Re: [PATCH 2/2] arm64: dts: amlogic: add libretech cottonwood support

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Date:   Wed, 04 Oct 2023 11:49:00 +0200
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Neil Armstrong <neil.armstrong@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     Kevin Hilman <khilman@...libre.com>, Da Xue <da.xue@...retech.co>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-amlogic@...ts.infradead.org
Subject: Re: [PATCH 2/2] arm64: dts: amlogic: add libretech cottonwood support


On Wed 04 Oct 2023 at 11:20, Neil Armstrong <neil.armstrong@...aro.org> wrote:

> On 02/10/2023 16:10, Jerome Brunet wrote:
>> Add support for the Libretech cottonwood board family.
>> These 2 boards are based on the same PCB, with an RPi B form factor.
>> The "Alta" board uses an a311d while the "Solitude" variant uses an
>> s905d3.
>> Co-developed-by: Da Xue <da.xue@...retech.co>
>> Signed-off-by: Da Xue <da.xue@...retech.co>
>> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
>> ---
>>   arch/arm64/boot/dts/amlogic/Makefile          |   2 +
>>   .../amlogic/meson-g12b-a311d-libretech-cc.dts | 133 ++++
>>   .../amlogic/meson-libretech-cottonwood.dtsi   | 610 ++++++++++++++++++
>>   .../amlogic/meson-sm1-s905d3-libretech-cc.dts |  89 +++
>>   4 files changed, 834 insertions(+)
>>   create mode 100644 arch/arm64/boot/dts/amlogic/meson-g12b-a311d-libretech-cc.dts
>>   create mode 100644 arch/arm64/boot/dts/amlogic/meson-libretech-cottonwood.dtsi
>>   create mode 100644 arch/arm64/boot/dts/amlogic/meson-sm1-s905d3-libretech-cc.dts
>> 
>
> <snip>
>
>> +
>> +	leds-pwm {
>> +		compatible = "pwm-leds";
>> +
>> +		led-green {
>> +			color = <LED_COLOR_ID_GREEN>;
>> +			function = LED_FUNCTION_STATUS;
>> +			linux,default-trigger = "default-on";
>> +			panic-indicator;
>> +			max-brightness = <255>;
>> +			pwms = <&pwm_cd 1 1250 0>;
>> +			active-low;
>> +		};
>> +
>> +		led-blue {
>> +			color = <LED_COLOR_ID_BLUE>;
>> +			function = LED_FUNCTION_ACTIVITY;
>> +			linux,default-trigger = "activity";
>
> "activity" isn't documented, perhaps heartbeat instead ?
>

The trigger does exist though. The other way is to extend the DT doc.
I don't really care one way or the other

I'll defer to Da on this one

>> +			max-brightness = <255>;
>> +			pwms = <&pwm_ab 1 1250 0>;
>> +			active-low;
>> +		};
>
> leds subnodes should be named as led(-[0-9a-f]+)
>
> see Documentation/devicetree/bindings/leds/leds-pwm.yaml

That I do care. The schematics refer to the leds by name. There is no
number assigned, much less hex. Making one up makes no sense.

User should be able to quickly (and easily) link  what they see in the
schematics with DT.

So I'd prefer to submit a change for the regex rather than changing this

>
>> +	};
>> +
>> +	leds-gpio {
>> +		compatible = "gpio-leds";
>> +
>> +		led-orange {
>> +			color = <LED_COLOR_ID_AMBER>;
>> +			function = LED_FUNCTION_STANDBY;
>> +			gpios = <&gpio GPIOX_6 GPIO_ACTIVE_LOW>;
>> +		};
>
> Ditto, but you can simply use "led" since it's the only one.
>
> See Documentation/devicetree/bindings/leds/leds-gpio.yaml
>
> Neil
>
>
> <snip>