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

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Message-ID: <20220413140632.GC4713@tom-ThinkPad-T14s-Gen-2i>
Date:   Wed, 13 Apr 2022 16:06:32 +0200
From:   Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
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 Wed, Apr 13, 2022 at 03:45:44PM +0200, Krzysztof Kozlowski wrote:
> 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

Hi Krzysztof,
Thanks for review, I'll update in v3.

Regards,
Tommaso
-- 
Tommaso Merciai
Embedded Linux Engineer
tommaso.merciai@...rulasolutions.com
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