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

[Ahmad Fatoum]

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@xxxxxxxxxxxxxxxxxxxx/
> 
> Signed-off-by: Tommaso Merciai <tommaso.merciai@xxxxxxxxxxxxxxxxxxxx>
> ---
> 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?

> +};
> +
>  &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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