linux-kernel - Re: [PATCH v3] arm64: dts: imx8mm-evk: add pwm1/backlight support

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Date:   Wed, 13 Apr 2022 23:35:46 +0200
From:   Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
To:     Ahmad Fatoum <a.fatoum@...gutronix.de>
Cc:     devicetree@...r.kernel.org, Fabio Estevam <festevam@...il.com>,
        Richard Zhu <hongxing.zhu@....com>,
        linux-amarula@...rulasolutions.com,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Joakim Zhang <qiangqing.zhang@....com>,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Tim Harvey <tharvey@...eworks.com>,
        linux-arm-kernel@...ts.infradead.org, Li Jun <jun.li@....com>
Subject: Re: [PATCH v3] arm64: dts: imx8mm-evk: add pwm1/backlight support

On Wed, Apr 13, 2022 at 06:31:34PM +0200, Ahmad Fatoum wrote:
> Hello Tomasso,
> 
> On 13.04.22 18:08, Tommaso Merciai wrote:
> > Add pwm1/backlight support nodes for imx8mm_evk board.
> > Align with u-boot dts
> > 
> > References:
> >  - https://patchwork.ozlabs.org/project/uboot/patch/20220326111911.13720-9-tommaso.merciai@amarulasolutions.com/
> > 
> > Signed-off-by: Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
> > ---
> > Changes since v1:
> >  - Fix commit body
> >  - Enable pwm, backlight
> > 
> > Changes since v2:
> >  - Remove status okay from pwm1,backlight (enable as default)
> > 
> >  arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi | 19 +++++++++++++++++++
> >  1 file changed, 19 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
> > index 6d67df7692f1..c50d2cc3ca71 100644
> > --- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
> > +++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
> > @@ -59,6 +59,14 @@ reg_usdhc2_vmmc: regulator-usdhc2 {
> >  		enable-active-high;
> >  	};
> >  
> > +	backlight: backlight {
> > +		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 +403,11 @@ &wdog1 {
> >  	status = "okay";
> >  };
> >  
> > +&pwm1 {
> > +	pinctrl-names = "default";
> > +	pinctrl-0 = <&pinctrl_backlight>;
> 
> imx8mm.dtsi has &pwm1 { status = "disabled" };
> Where is it enabled?

Hi Ahmad,
Thanks for review, update in v4.

Tommaso
> 
> > +};
> > +
> >  &iomuxc {
> >  	pinctrl_fec1: fec1grp {
> >  		fsl,pins = <
> > @@ -549,4 +562,10 @@ pinctrl_wdog: wdoggrp {
> >  			MX8MM_IOMUXC_GPIO1_IO02_WDOG1_WDOG_B	0x166
> >  		>;
> >  	};
> > +
> > +	pinctrl_backlight: backlightgrp {
> > +		fsl,pins = <
> > +			MX8MM_IOMUXC_GPIO1_IO01_PWM1_OUT	0x06
> > +		>;
> > +	};
> >  };
> 
> 
> -- 
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-- 
Tommaso Merciai
Embedded Linux Engineer
tommaso.merciai@...rulasolutions.com
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