linux-kernel - Re: [PATCH v2 3/4] arm64: dts: sun50i-a64-pinephone: add multicolor led node

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Date: Fri, 23 Feb 2024 09:46:25 +0100
From: Ondřej Jirman <megi@....cz>
To: Aren Moynihan <aren@...cevolution.org>
Cc: linux-kernel@...r.kernel.org, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org, 
	Jean-Jacques Hiblot <jjhiblot@...phandler.com>, Chen-Yu Tsai <wens@...e.org>, linux-sunxi@...ts.linux.dev, 
	Lee Jones <lee@...nel.org>, Pavel Machek <pavel@....cz>, 
	linux-arm-kernel@...ts.infradead.org, Jernej Skrabec <jernej.skrabec@...il.com>, 
	linux-leds@...r.kernel.org, Conor Dooley <conor+dt@...nel.org>, Miles Alan <m@...esalan.com>, 
	Samuel Holland <samuel@...lland.org>
Subject: Re: [PATCH v2 3/4] arm64: dts: sun50i-a64-pinephone: add multicolor
 led node

Hello Aren,

On Tue, Feb 06, 2024 at 01:13:19PM -0500, Aren Moynihan wrote:
> The red, green, and blue leds currently in the device tree represent a
> single rgb led on the front of the PinePhone.
> 
> Signed-off-by: Aren Moynihan <aren@...cevolution.org>
> ---
> 
> Changes in v2:
>  - remove function property from individual led nodes
> 
>  .../boot/dts/allwinner/sun50i-a64-pinephone.dtsi | 16 ++++++++++------
>  1 file changed, 10 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
> index ad2476ee01e4..e53e0d4579a7 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
> @@ -39,28 +39,32 @@ chosen {
>  	leds {
>  		compatible = "gpio-leds";
>  
> -		led-0 {
> -			function = LED_FUNCTION_INDICATOR;

This looks like a needless change that will just break people's current scripts
and setup. It does mine, and there sure are others that will be surprised, too.

This leads to a change in sysfs path from:

  /sys/class/leds/blue:indicator

to

  /sys/class/leds/blue:

which is 1) a weird name and 2) a backwards compatibility break for seemingly
no apparent reason. Any reaons for the change?

People normally hardcode these paths in eg. /etc/tmpfiles.d to apply LED triggers
to particular LEDs.

Kind regards,
	o.

> +		led0: led-0 {
>  			color = <LED_COLOR_ID_BLUE>;
>  			gpios = <&pio 3 20 GPIO_ACTIVE_HIGH>; /* PD20 */
>  			retain-state-suspended;
>  		};
>  
> -		led-1 {
> -			function = LED_FUNCTION_INDICATOR;
> +		led1: led-1 {
>  			color = <LED_COLOR_ID_GREEN>;
>  			gpios = <&pio 3 18 GPIO_ACTIVE_HIGH>; /* PD18 */
>  			retain-state-suspended;
>  		};
>  
> -		led-2 {
> -			function = LED_FUNCTION_INDICATOR;
> +		led2: led-2 {
>  			color = <LED_COLOR_ID_RED>;
>  			gpios = <&pio 3 19 GPIO_ACTIVE_HIGH>; /* PD19 */
>  			retain-state-suspended;
>  		};
>  	};
>  
> +	multi-led {
> +		compatible = "leds-group-multicolor";
> +		color = <LED_COLOR_ID_RGB>;
> +		function = LED_FUNCTION_INDICATOR;
> +		leds = <&led0>, <&led1>, <&led2>;
> +	};
> +
>  	reg_ps: ps-regulator {
>  		compatible = "regulator-fixed";
>  		regulator-name = "ps";
> -- 
> 2.43.0
>