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arm64: dts: mediatek: cherry: Add configuration for display backlight

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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@collabora.com>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Tested-by: Chen-Yu Tsai <wenst@chromium.org>
Link: https://lore.kernel.org/r/20230223145426.193590-5-angelogioacchino.delregno@collabora.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
This commit is contained in:
AngeloGioacchino Del Regno
2023-02-23 15:54:26 +01:00
committed by Matthias Brugger
parent b86b946446
commit ee508454fd
1 changed files with 24 additions and 0 deletions
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24
arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
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@@ -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";
};
@@ -212,6 +222,13 @@ edp_out: endpoint {
};
};
&disp_pwm0 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&disp_pwm0_pin_default>;
};
&dp_tx {
status = "okay";
@@ -653,6 +670,13 @@ pins-cmd-dat {
};
};
disp_pwm0_pin_default: disp-pwm0-default-pins {
pins-disp-pwm {
pinmux = <PINMUX_GPIO82__FUNC_GPIO82>,
<PINMUX_GPIO97__FUNC_DISP_PWM0>;
};
};
dptx_pin: dptx-default-pins {
pins-cmd-dat {
pinmux = <PINMUX_GPIO18__FUNC_DP_TX_HPD>;