Configure the hardware PWM for the integrated display's backlight:
all Cherry devices enable the backlight with GPIO82 and manage the
PWM via MediaTek disp-pwm on GPIO97.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
---
.../boot/dts/mediatek/mt8195-cherry.dtsi | 24 +++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
index d679a04207d8..c50f1e2914b2 100644
--- a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
@@ -22,6 +22,16 @@ aliases {
serial0 = &uart0;
};
+ backlight_lcd0: backlight-lcd0 {
+ compatible = "pwm-backlight";
+ brightness-levels = <0 1023>;
+ default-brightness-level = <576>;
+ enable-gpios = <&pio 82 GPIO_ACTIVE_HIGH>;
+ num-interpolated-steps = <1023>;
+ pwms = <&disp_pwm0 0 500000>;
+ power-supply = <&ppvar_sys>;
+ };
+
chosen {
stdout-path = "serial0:115200n8";
};
@@ -349,6 +359,13 @@ &auxadc {
status = "okay";
};
+&disp_pwm0 {
+ status = "okay";
+
+ pinctrl-names = "default";
+ pinctrl-0 = <&disp_pwm0_pin_default>;
+};
+
&i2c0 {
status = "okay";
@@ -773,6 +790,13 @@ pins-cmd-dat {
};
};
+ disp_pwm0_pin_default: disp-pwm0-default-pins {
+ pins-disp-pwm {
+ pinmux = <PINMUX_GPIO82__FUNC_GPIO82>,
+ <PINMUX_GPIO97__FUNC_DISP_PWM0>;
+ };
+ };
+
i2c0_pins: i2c0-default-pins {
pins-bus {
pinmux = <PINMUX_GPIO8__FUNC_SDA0>,
--
2.39.2
