From fb8955d9d30e48c144722c75d8c28745e313a62a Mon Sep 17 00:00:00 2001 From: Dave Stevenson Date: Fri, 7 Jan 2022 11:12:08 +0000 Subject: [PATCH] dtoverlays: Add backlight-gpio parameter to vc4-kms-dpi-generic To allow for the cases where a simple panel does have a GPIO controlled backlight. Defaults to having no backlight defined. Signed-off-by: Dave Stevenson --- arch/arm/boot/dts/overlays/README | 2 ++ .../overlays/vc4-kms-dpi-generic-overlay.dts | 19 +++++++++++++++++++ 2 files changed, 21 insertions(+) diff --git a/arch/arm/boot/dts/overlays/README b/arch/arm/boot/dts/overlays/README index 6b9a5ef7400a22..4d3448f047bf97 100644 --- a/arch/arm/boot/dts/overlays/README +++ b/arch/arm/boot/dts/overlays/README @@ -3625,6 +3625,8 @@ Params: clock-frequency Display clock frequency (Hz) rgb888 Change to RGB888 output on GPIOs 0-27 bus-format Override the bus format for a MEDIA_BUS_FMT_* value. NB also overridden by rgbXXX overrides. + backlight-gpio Defines a GPIO to be used for backlight control + (default of none). Name: vc4-kms-dsi-7inch diff --git a/arch/arm/boot/dts/overlays/vc4-kms-dpi-generic-overlay.dts b/arch/arm/boot/dts/overlays/vc4-kms-dpi-generic-overlay.dts index def175746f666d..7846d56c1d1a5c 100644 --- a/arch/arm/boot/dts/overlays/vc4-kms-dpi-generic-overlay.dts +++ b/arch/arm/boot/dts/overlays/vc4-kms-dpi-generic-overlay.dts @@ -63,6 +63,23 @@ }; }; + fragment@2 { + target = <&panel>; + __dormant__ { + backlight = <&backlight>; + }; + }; + + fragment@3 { + target-path = "/"; + __dormant__ { + backlight: backlight { + compatible = "gpio-backlight"; + gpios = <&gpio 255 GPIO_ACTIVE_HIGH>; + }; + }; + }; + __overrides__ { clock-frequency = <&timing>, "clock-frequency:0"; hactive = <&timing>, "hactive:0"; @@ -88,5 +105,7 @@ rgb888 = <&panel>, "bus-format:0=0x100a", <&dpi_node>, "pinctrl-0:0=",<&dpi_gpio0>; bus-format = <&panel>, "bus-format:0"; + backlight-gpio = <0>, "+2+3", + <&backlight>, "gpios:4"; }; };