forked from Qortal/Brooklyn
48 lines
1.1 KiB
Plaintext
48 lines
1.1 KiB
Plaintext
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/*
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* Devicetree overlay for GPIO based backlight on/off capability.
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*
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* Use this if you have one of those HDMI displays whose backlight cannot be
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* controlled via DPMS over HDMI and plan to do a little soldering to use an
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* RPi gpio pin for on/off switching.
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*
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* See: https://www.waveshare.com/wiki/7inch_HDMI_LCD_(C)#Backlight_Control
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*
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*/
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/dts-v1/;
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/plugin/;
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/ {
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compatible = "brcm,bcm2835";
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fragment@1 {
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target = <&gpio>;
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__overlay__ {
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hdmi_backlight_hwhack_gpio_pins: hdmi_backlight_hwhack_gpio_pins {
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brcm,pins = <17>;
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brcm,function = <1>; /* out */
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};
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};
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};
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fragment@2 {
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target-path = "/";
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__overlay__ {
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hdmi_backlight_hwhack_gpio: hdmi_backlight_hwhack_gpio {
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compatible = "gpio-backlight";
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pinctrl-names = "default";
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pinctrl-0 = <&hdmi_backlight_hwhack_gpio_pins>;
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gpios = <&gpio 17 0>;
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default-on;
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};
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};
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};
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__overrides__ {
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gpio_pin = <&hdmi_backlight_hwhack_gpio>,"gpios:4",
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<&hdmi_backlight_hwhack_gpio_pins>,"brcm,pins:0";
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active_low = <&hdmi_backlight_hwhack_gpio>,"gpios:8";
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};
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};
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