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From 97a59d460244efdb87b464b9f07c1e90e7e7129a Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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 <dave.stevenson@raspberrypi.com>
---
arch/arm/boot/dts/overlays/README | 2 ++
.../overlays/vc4-kms-dpi-generic-overlay.dts | 19 +++++++++++++++++++
2 files changed, 21 insertions(+)
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -3638,6 +3638,8 @@ Params: clock-frequency Display
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
--- 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";
};
};
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