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

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Message-ID: <k26bellccok4tj3kz2nrtp2vth2rnsiea677e2kzm56m767wjx@pnkqiz5hmiyb>
Date: Wed, 31 Jan 2024 20:28:25 -0500
From: Aren <aren@...cevolution.org>
To: Jernej Škrabec <jernej.skrabec@...il.com>
Cc: linux-kernel@...r.kernel.org, Miles Alan <m@...esalan.com>, 
	Ondrej Jirman <megi@....cz>, Chen-Yu Tsai <wens@...e.org>, Conor Dooley <conor+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Rob Herring <robh+dt@...nel.org>, 
	Samuel Holland <samuel@...lland.org>, devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH 3/4] arm64: dts: sun50i-a64-pinephone: add multicolor led
 node

On Tue, Jan 30, 2024 at 08:41:14PM +0100, Jernej Škrabec wrote:
> Dne nedelja, 28. januar 2024 ob 21:45:09 CET je Aren Moynihan napisal(a):
> > 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>
> > ---
> > 
> >  .../boot/dts/allwinner/sun50i-a64-pinephone.dtsi    | 13 ++++++++++---
> >  1 file changed, 10 insertions(+), 3 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..6eab61a12cd8 100644
> > --- a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
> > +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
> > @@ -39,21 +39,21 @@ chosen {
> >  	leds {
> >  		compatible = "gpio-leds";
> >  
> > -		led-0 {
> > +		led0: led-0 {
> >  			function = LED_FUNCTION_INDICATOR;
> >  			color = <LED_COLOR_ID_BLUE>;
> >  			gpios = <&pio 3 20 GPIO_ACTIVE_HIGH>; /* PD20 */
> >  			retain-state-suspended;
> >  		};
> >  
> > -		led-1 {
> > +		led1: led-1 {
> >  			function = LED_FUNCTION_INDICATOR;
> >  			color = <LED_COLOR_ID_GREEN>;
> >  			gpios = <&pio 3 18 GPIO_ACTIVE_HIGH>; /* PD18 */
> >  			retain-state-suspended;
> >  		};
> >  
> > -		led-2 {
> > +		led2: led-2 {
> >  			function = LED_FUNCTION_INDICATOR;
> >  			color = <LED_COLOR_ID_RED>;
> >  			gpios = <&pio 3 19 GPIO_ACTIVE_HIGH>; /* PD19 */
> > @@ -61,6 +61,13 @@ led-2 {
> >  		};
> >  	};
> >  
> > +	multi-led {
> > +		compatible = "leds-group-multicolor";
> > +		color = <LED_COLOR_ID_RGB>;
> > +		function = LED_FUNCTION_INDICATOR;
> 
> Does it make sense to have function specified here and above? Example
> specifies it only in multi-led node.

I'm not sure it makes much of a difference, besides perhaps confusing
userspace. From what I can tell the only thing it'll change is the name
of the directory in sysfs from "<color>:status" to "<color>:". I'll
change this in v2 unless anyone has a reason not to.

Thanks
 - Aren

> Best regards,
> Jernej
> 
> > +		leds = <&led0>, <&led1>, <&led2>;
> > +	};
> > +
> >  	reg_ps: ps-regulator {
> >  		compatible = "regulator-fixed";
> >  		regulator-name = "ps";