ARM: dts: imx7d-sdb: Restore pwm backlight support

This was removed in commit 5eaeaccdaedb ("ARM: dts: imx7d-sdb: Pass
'enable-gpios' and 'power-supply' properties") with a note claiming that
GPIO1_IO01 is connected to a pin labeled as "PWREN" on the connector.

Despite that label this pin does actually work as a PWM controlling
brightness. So restore pwm functionality.

Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm/boot/dts/imx7d-sdb.dts b/arch/arm/boot/dts/imx7d-sdb.dts
index 9f9e6a1e3b7293f3378b011b69e6aaedb5661907..8d137acb9f07cf8e9a5b1764ff23906ddeee7ae2 100644 (file)
--- a/arch/arm/boot/dts/imx7d-sdb.dts
+++ b/arch/arm/boot/dts/imx7d-sdb.dts
@@ -108,10 +108,17 @@ reg_can2_3v3: regulator-can2-3v3 {
                gpio = <&gpio2 14 GPIO_ACTIVE_LOW>;
        };
 
+       backlight: backlight {
+               compatible = "pwm-backlight";
+               pwms = <&pwm1 0 5000000 0>;
+               brightness-levels = <0 4 8 16 32 64 128 255>;
+               default-brightness-level = <6>;
+               status = "okay";
+       };
+
        panel {
                compatible = "innolux,at043tn24";
-               pinctrl-0 = <&pinctrl_backlight>;
-               enable-gpios = <&gpio1 1 GPIO_ACTIVE_HIGH>;
+               backlight = <&backlight>;
                power-supply = <&reg_lcd_3v3>;
 
                port {
@@ -704,6 +711,12 @@ MX7D_PAD_SD3_STROBE__SD3_STROBE            0x1b
        };
 };
 
+&pwm1 {
+       pinctrl-names = "default";
+       pinctrl-0 = <&pinctrl_pwm1>;
+       status = "okay";
+};
+
 &iomuxc_lpsr {
        pinctrl_wdog: wdoggrp {
                fsl,pins = <
@@ -711,9 +724,9 @@ MX7D_PAD_LPSR_GPIO1_IO00__WDOG1_WDOG_B              0x74
                >;
        };
 
-       pinctrl_backlight: backlightgrp {
+       pinctrl_pwm1: pwm1grp {
                fsl,pins = <
-                       MX7D_PAD_LPSR_GPIO1_IO01__GPIO1_IO1             0x110b0
+                       MX7D_PAD_LPSR_GPIO1_IO01__PWM1_OUT              0x30
                >;
        };
 };