arm64: dts: mediatek: asurada: Add display backlight

Add the display backlight for the Asurada platform. It relies on the
display PWM controller, so also enable and configure this component.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Link: https://lore.kernel.org/r/20221102190611.283546-3-nfraprado@collabora.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

diff --git a/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi b/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi
index fafca7428539107f3adf927710c1cd61ebedb06e..666021ca4d4f574d1f8e2e669ae382e90def7f62 100644 (file)
--- a/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi
@@ -23,6 +23,16 @@ memory@40000000 {
                reg = <0 0x40000000 0 0x80000000>;
        };
 
+       backlight_lcd0: backlight-lcd0 {
+               compatible = "pwm-backlight";
+               pwms = <&pwm0 0 500000>;
+               power-supply = <&ppvar_sys>;
+               enable-gpios = <&pio 152 0>;
+               brightness-levels = <0 1023>;
+               num-interpolated-steps = <1023>;
+               default-brightness-level = <576>;
+       };
+
        pp1000_dpbrdg: regulator-1v0-dpbrdg {
                compatible = "regulator-fixed";
                regulator-name = "pp1000_dpbrdg";
@@ -838,6 +848,17 @@ pins-pcie-en-pp3300-wlan {
                };
        };
 
+       pwm0_pins: pwm0-default-pins {
+               pins-pwm {
+                       pinmux = <PINMUX_GPIO40__FUNC_DISP_PWM>;
+               };
+
+               pins-inhibit {
+                       pinmux = <PINMUX_GPIO152__FUNC_GPIO152>;
+                       output-high;
+               };
+       };
+
        scp_pins: scp-pins {
                pins-vreq-vao {
                        pinmux = <PINMUX_GPIO195__FUNC_SCP_VREQ_VAO>;
@@ -899,6 +920,13 @@ &pmic {
        interrupts-extended = <&pio 214 IRQ_TYPE_LEVEL_HIGH>;
 };
 
+&pwm0 {
+       status = "okay";
+
+       pinctrl-names = "default";
+       pinctrl-0 = <&pwm0_pins>;
+};
+
 &scp {
        status = "okay";