linux-kernel - Re: [PATCH 1/2] ARM: dts: sunxi: Fix GPIO LED node names

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Date:   Fri, 25 Nov 2022 15:50:07 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Andre Przywara <andre.przywara@....com>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH 1/2] ARM: dts: sunxi: Fix GPIO LED node names

Hi Andre,

On 11/25/22 15:40, Andre Przywara wrote:
> On Fri, 25 Nov 2022 13:54:00 -0600
> Samuel Holland <samuel@...lland.org> wrote:
> 
> Hi Samuel,
> 
>> These board devicetrees fail to validate because the gpio-leds schema
>> requires its child nodes to have "led" in the node name.
>>
>> Signed-off-by: Samuel Holland <samuel@...lland.org>
> 
> That looks alright, though the comment in the binding says that we
> should just have led-0, led-1 instead, so just (hex) numbers. The
> "status" name is also in the label, so we wouldn't lose information.

I am not a fan of giving the LEDs meaningless enumerators, but I can do
that if the maintainers insist.

> Actually, also "label" is deprecated, in favour of "color" and
> "function", shall this be fixed on the way? Or is there anything that
> breaks (older kernels) when removing the label property? 

The label is exposed to userspace as the path in sysfs, so we cannot
change it. There is no way to construct that exact label using function
and color -- see led_compose_name().

Regards,
Samuel

>> ---
>>
>>  arch/arm/boot/dts/sun5i-gr8-chip-pro.dts | 2 +-
>>  arch/arm/boot/dts/sun5i-r8-chip.dts      | 2 +-
>>  arch/arm/boot/dts/sun6i-a31s-sina31s.dts | 2 +-
>>  3 files changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/arch/arm/boot/dts/sun5i-gr8-chip-pro.dts b/arch/arm/boot/dts/sun5i-gr8-chip-pro.dts
>> index a32cde3e32eb..3222f1490716 100644
>> --- a/arch/arm/boot/dts/sun5i-gr8-chip-pro.dts
>> +++ b/arch/arm/boot/dts/sun5i-gr8-chip-pro.dts
>> @@ -70,7 +70,7 @@ chosen {
>>  	leds {
>>  		compatible = "gpio-leds";
>>  
>> -		status {
>> +		led-status {
>>  			label = "chip-pro:white:status";
>>  			gpios = <&axp_gpio 2 GPIO_ACTIVE_HIGH>;
>>  			default-state = "on";
>> diff --git a/arch/arm/boot/dts/sun5i-r8-chip.dts b/arch/arm/boot/dts/sun5i-r8-chip.dts
>> index 4bf4943d4eb7..303191c926c2 100644
>> --- a/arch/arm/boot/dts/sun5i-r8-chip.dts
>> +++ b/arch/arm/boot/dts/sun5i-r8-chip.dts
>> @@ -70,7 +70,7 @@ chosen {
>>  	leds {
>>  		compatible = "gpio-leds";
>>  
>> -		status {
>> +		led-status {
>>  			label = "chip:white:status";
>>  			gpios = <&axp_gpio 2 GPIO_ACTIVE_HIGH>;
>>  			default-state = "on";
>> diff --git a/arch/arm/boot/dts/sun6i-a31s-sina31s.dts b/arch/arm/boot/dts/sun6i-a31s-sina31s.dts
>> index 0af48e143b66..b84822453381 100644
>> --- a/arch/arm/boot/dts/sun6i-a31s-sina31s.dts
>> +++ b/arch/arm/boot/dts/sun6i-a31s-sina31s.dts
>> @@ -67,7 +67,7 @@ hdmi_con_in: endpoint {
>>  	leds {
>>  		compatible = "gpio-leds";
>>  
>> -		status {
>> +		led-status {
>>  			label = "sina31s:status:usr";
>>  			gpios = <&pio 7 13 GPIO_ACTIVE_HIGH>; /* PH13 */
>>  		};
>