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20ea6adbf1
Build system: x86_64 Build-tested: bcm2708, bcm2709, bcm2710, bcm2711 Run-tested: bcm2708/RPiB+, bcm2709/RPi3B, bcm2710/RPi3B, bcm2711/RPi4B Signed-off-by: Marty Jones <mj8263788@gmail.com> Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
108 lines
3.4 KiB
Diff
108 lines
3.4 KiB
Diff
From 7ec32023e6ad31c242e2acc179fd35084fa9cea5 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Fri, 21 Jan 2022 14:22:01 +0000
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Subject: [PATCH] dtoverlays: Add pwm backlight option to
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vc4-kms-dpi-generic
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Adds the option of a PWM controlled backlight on a generic
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DPI display.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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arch/arm/boot/dts/overlays/README | 17 +++++++
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.../overlays/vc4-kms-dpi-generic-overlay.dts | 51 +++++++++++++++++++
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2 files changed, 68 insertions(+)
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -3644,6 +3644,23 @@ Params: clock-frequency Display
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value. NB also overridden by rgbXXX overrides.
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backlight-gpio Defines a GPIO to be used for backlight control
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(default of none).
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+ backlight-pwm Defines a PWM channel to be used for backlight
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+ control (default of none). NB Disables audio
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+ headphone output as that also uses PWM.
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+ backlight-pwm-chan Choose channel on &pwm node for backlight
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+ control.
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+ (default 0).
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+ backlight-pwm-gpio GPIO pin to be used for the PWM backlight. See
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+ pwm-2chan for valid options.
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+ (default 18 - note this can only work with
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+ rgb666-padhi).
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+ backlight-pwm-func Pin function of GPIO used for the PWM
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+ backlight.
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+ See pwm-2chan for valid options.
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+ (default 2).
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+ backlight-def-brightness
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+ Set the default brightness. Normal range 1-16.
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+ (default 16).
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Name: vc4-kms-dsi-7inch
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--- a/arch/arm/boot/dts/overlays/vc4-kms-dpi-generic-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/vc4-kms-dpi-generic-overlay.dts
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@@ -80,6 +80,52 @@
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};
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};
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+ fragment@4 {
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+ target = <&panel>;
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+ __dormant__ {
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+ backlight = <&backlight_pwm>;
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+ };
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+ };
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+
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+ fragment@5 {
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+ target-path = "/";
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+ __dormant__ {
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+ backlight_pwm: backlight_pwm {
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+ compatible = "pwm-backlight";
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+ brightness-levels = <0 6 8 12 16 24 32 40 48 64 96 128 160 192 224 255>;
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+ default-brightness-level = <16>;
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+ pwms = <&pwm 0 200000>;
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+ };
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+ };
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+ };
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+
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+ fragment@6 {
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+ target = <&pwm>;
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+ __dormant__ {
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+ pinctrl-names = "default";
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+ pinctrl-0 = <&pwm_pins>;
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+ assigned-clock-rates = <1000000>;
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+ status = "okay";
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+ };
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+ };
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+
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+ fragment@7 {
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+ target = <&gpio>;
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+ __dormant__ {
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+ pwm_pins: pwm_pins {
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+ brcm,pins = <18>;
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+ brcm,function = <2>; /* Alt5 */
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+ };
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+ };
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+ };
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+
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+ fragment@8 {
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+ target = <&audio>;
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+ __dormant__ {
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+ brcm,disable-headphones;
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+ };
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+ };
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+
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__overrides__ {
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clock-frequency = <&timing>, "clock-frequency:0";
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hactive = <&timing>, "hactive:0";
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@@ -107,5 +153,10 @@
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bus-format = <&panel>, "bus-format:0";
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backlight-gpio = <0>, "+2+3",
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<&backlight>, "gpios:4";
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+ backlight-pwm = <0>, "+4+5+6+7+8";
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+ backlight-pwm-chan = <&backlight_pwm>, "pwms:4";
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+ backlight-pwm-gpio = <&pwm_pins>, "brcm,pins:0";
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+ backlight-pwm-func = <&pwm_pins>, "brcm,function:0";
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+ backlight-def-brightness = <&backlight_pwm>, "default-brightness-level:0";
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};
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};
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