linux-kernel - Re: [PATCH 3/4] arm64: dts: apple: t8103: Add PWM controller

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Message-ID: <55b03c70-cc77-43e7-7ca2-8a0445a40cea@linaro.org>
Date:   Fri, 28 Oct 2022 13:56:57 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Sasha Finkelstein <fnkl.kernel@...il.com>,
        thierry.reding@...il.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org
Cc:     marcan@...can.st, sven@...npeter.dev, alyssa@...enzweig.io,
        asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-pwm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] arm64: dts: apple: t8103: Add PWM controller

On 28/10/2022 12:52, Sasha Finkelstein wrote:
> Adds PWM controller and keyboard backlight bindings for M1 MacBooks
> 
> Signed-off-by: Sasha Finkelstein <fnkl.kernel@...il.com>
> ---
>  arch/arm64/boot/dts/apple/t8103-j293.dts | 20 ++++++++++++++++++++
>  arch/arm64/boot/dts/apple/t8103-j313.dts | 20 ++++++++++++++++++++
>  arch/arm64/boot/dts/apple/t8103.dtsi     |  9 +++++++++
>  3 files changed, 49 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/apple/t8103-j293.dts b/arch/arm64/boot/dts/apple/t8103-j293.dts
> index ecb10d237a05..5652cd41730a 100644
> --- a/arch/arm64/boot/dts/apple/t8103-j293.dts
> +++ b/arch/arm64/boot/dts/apple/t8103-j293.dts
> @@ -11,6 +11,7 @@
>  
>  #include "t8103.dtsi"
>  #include "t8103-jxxx.dtsi"
> +#include <dt-bindings/leds/common.h>
>  
>  / {
>  	compatible = "apple,j293", "apple,t8103", "apple,arm-platform";
> @@ -43,3 +44,22 @@ &i2c2 {
>  &i2c4 {
>  	status = "okay";
>  };
> +
> +/ {
> +	pwmleds {

Node names should be generic: led-controller
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation


> +		compatible = "pwm-leds";
> +		kbd-backlight {

Does not look like you tested the DTS against bindings. Please run `make
dtbs_check` (see Documentation/devicetree/bindings/writing-schema.rst
for instructions).

> +			pwms = <&fpwm1 0 40000>;
> +			label = "kbd_backlight";
> +			function = LED_FUNCTION_KBD_BACKLIGHT;
> +			color = <LED_COLOR_ID_WHITE>;
> +			max-brightness = <255>;
> +			default-state = "keep";
> +			pwm-names = "kbd-backlight";

This goes just after pwms.

> +		};
> +	};
> +};
> +
> +&fpwm1 {
> +	status = "okay";
> +};
> diff --git a/arch/arm64/boot/dts/apple/t8103-j313.dts b/arch/arm64/boot/dts/apple/t8103-j313.dts
> index df741737b8e6..cff53f8770f3 100644
> --- a/arch/arm64/boot/dts/apple/t8103-j313.dts
> +++ b/arch/arm64/boot/dts/apple/t8103-j313.dts
> @@ -11,6 +11,7 @@
>  
>  #include "t8103.dtsi"
>  #include "t8103-jxxx.dtsi"
> +#include <dt-bindings/leds/common.h>
>  
>  / {
>  	compatible = "apple,j313", "apple,t8103", "apple,arm-platform";
> @@ -35,3 +36,22 @@ &pcie0_dart_2 {
>  
>  /delete-node/ &port01;
>  /delete-node/ &port02;
> +
> +/ {
> +	pwmleds {

Same comments

> +		compatible = "pwm-leds";
> +		kbd-backlight {
> +			pwms = <&fpwm1 0 40000>;
> +			label = "kbd_backlight";
> +			function = LED_FUNCTION_KBD_BACKLIGHT;
> +			color = <LED_COLOR_ID_WHITE>;
> +			max-brightness = <255>;
> +			default-state = "keep";
> +			pwm-names = "kbd-backlight";
> +		};
> +	};
> +};
> +
> +&fpwm1 {
> +	status = "okay";
> +};
> diff --git a/arch/arm64/boot/dts/apple/t8103.dtsi b/arch/arm64/boot/dts/apple/t8103.dtsi
> index 51a63b29d404..a95dc482102e 100644
> --- a/arch/arm64/boot/dts/apple/t8103.dtsi
> +++ b/arch/arm64/boot/dts/apple/t8103.dtsi
> @@ -191,6 +191,15 @@ i2c4: i2c@...020000 {
>  			status = "disabled"; /* only used in J293 */
>  		};
>  
> +		fpwm1: fpwm@...044000 {

Node names should be generic, so pwm.
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

> +			compatible = "apple,t8103-fpwm", "apple,s5l-fpwm";
> +			reg = <0x2 0x35044000 0x0 0x4000>;

Best regards,
Krzysztof