arm64: dts: imx8mm-evk: add pwm1/backlight support

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@amarulasolutions.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
index 6d67df7692f1f46372cb32aa6fef288cbcb5ef81..6a209395452a769d1c5081e2b24d22df57a65f8f 100644 (file)
--- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
@@ -59,6 +59,14 @@
                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 +403,12 @@
        status = "okay";
 };
 
+&pwm1 {
+       pinctrl-names = "default";
+       pinctrl-0 = <&pinctrl_backlight>;
+       status = "okay";
+};
+
 &iomuxc {
        pinctrl_fec1: fec1grp {
                fsl,pins = <
@@ -549,4 +563,10 @@
                        MX8MM_IOMUXC_GPIO1_IO02_WDOG1_WDOG_B    0x166
                >;
        };
+
+       pinctrl_backlight: backlightgrp {
+               fsl,pins = <
+                       MX8MM_IOMUXC_GPIO1_IO01_PWM1_OUT        0x06
+               >;
+       };
 };