linux-kernel - Re: [PATCH v2] arm64: dts: imx8mm-evk: add pwm1/backlight support

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Date:   Wed, 13 Apr 2022 15:45:44 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
Cc:     linux-amarula@...rulasolutions.com,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Joakim Zhang <qiangqing.zhang@....com>,
        Li Jun <jun.li@....com>, Tim Harvey <tharvey@...eworks.com>,
        Richard Zhu <hongxing.zhu@....com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: imx8mm-evk: add pwm1/backlight support

On 13/04/2022 14:56, Tommaso Merciai wrote:
> Add pwm1/backlight support nodes for imx8mm_evk board.
> Align with u-boot dts
> 

Thank you for your patch. There is something to discuss/improve.

> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
> index 6d67df7692f1..4c18f8fcd377 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
> @@ -59,6 +59,15 @@ reg_usdhc2_vmmc: regulator-usdhc2 {
>  		enable-active-high;
>  	};
>  
> +	backlight: backlight {
> +		status = "okay";

All nodes have status=okay by default, so no need for this.

> +		compatible = "pwm-backlight";
> +		pwms = <&pwm1 0 5000000>;
> +		brightness-levels = <0 255>;
> +		num-interpolated-steps = <255>;
> +		default-brightness-level = <250>;
> +	};
> +
>  	ir-receiver {
>  		compatible = "gpio-ir-receiver";
>  		gpios = <&gpio1 13 GPIO_ACTIVE_LOW>;
> @@ -395,6 +404,12 @@ &wdog1 {
>  	status = "okay";
>  };
>  
> +&pwm1 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_backlight>;
> +	status = "okay";

This is needed if the node was disabled in DTSI (I did not check it).


Best regards,
Krzysztof