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

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Message-ID: <5hqfabcolgqcu22hs3xnaimojwuz26tzi63px3rvbsgxa6kjss@ik42w7k26see>
Date: Fri, 23 Feb 2024 10:22:36 -0500
From: Aren <aren@...cevolution.org>
To: Ondřej Jirman <megi@....cz>, 
	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

On Fri, Feb 23, 2024 at 09:46:25AM +0100, Ondřej Jirman wrote:
> 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?

Leds-group-multicolor will make those read-only, so that will break when
it's enabled either way. Removing the function property makes it less
likely that programs attempting to discover leds will use the wrong
path.

I left these in v1 of this patch, but was recommended to remove them.
https://lore.kernel.org/lkml/k26bellccok4tj3kz2nrtp2vth2rnsiea677e2kzm56m767wjx@pnkqiz5hmiyb/

Thanks for taking a look at this
 - Aren

> 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
> >