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From 729a4f56f3db3ad4ec5dbc740312abf8d44c183d Mon Sep 17 00:00:00 2001
From: Phil Elwell <pelwell@users.noreply.github.com>
Date: Mon, 12 Sep 2016 13:46:56 +0100
Subject: [PATCH] overlays: Add dpi18 overlay (#1634)
Add support for 18-bit DPI displays. Although the dpi24 overlay could
be used, this overlay leaves GPIOs 22-27 free for other uses.
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 8 +++++++
arch/arm/boot/dts/overlays/dpi18-overlay.dts | 31 ++++++++++++++++++++++++++++
3 files changed, 40 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/dpi18-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -22,6 +22,7 @@ dtbo-$(RPI_DT_OVERLAYS) += audremap.dtbo
dtbo-$(RPI_DT_OVERLAYS) += bmp085_i2c-sensor.dtbo
dtbo-$(RPI_DT_OVERLAYS) += dht11.dtbo
dtbo-$(RPI_DT_OVERLAYS) += dionaudio-loco.dtbo
+dtbo-$(RPI_DT_OVERLAYS) += dpi18.dtbo
dtbo-$(RPI_DT_OVERLAYS) += dpi24.dtbo
dtbo-$(RPI_DT_OVERLAYS) += dwc-otg.dtbo
dtbo-$(RPI_DT_OVERLAYS) += dwc2.dtbo
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -283,6 +283,14 @@ Load: dtoverlay=dionaudio-loco
Params: <None>
+Name: dpi18
+Info: Overlay for a generic 18-bit DPI display
+ This uses GPIOs 0-21 (so no I2C, uart etc.), and activates the output
+ 2-3 seconds after the kernel has started.
+Load: dtoverlay=dpi18
+Params: <None>
+
+
Name: dpi24
Info: Overlay for a generic 24-bit DPI display
This uses GPIOs 0-27 (so no I2C, uart etc.), and activates the output
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/dpi18-overlay.dts
@@ -0,0 +1,31 @@
+/dts-v1/;
+/plugin/;
+
+/{
+ compatible = "brcm,bcm2708";
+
+ // There is no DPI driver module, but we need a platform device
+ // node (that doesn't already use pinctrl) to hang the pinctrl
+ // reference on - leds will do
+
+ fragment@0 {
+ target = <&leds>;
+ __overlay__ {
+ pinctrl-names = "default";
+ pinctrl-0 = <&dpi18_pins>;
+ };
+ };
+
+ fragment@1 {
+ target = <&gpio>;
+ __overlay__ {
+ dpi18_pins: dpi18_pins {
+ brcm,pins = <0 1 2 3 4 5 6 7 8 9 10 11
+ 12 13 14 15 16 17 18 19 20
+ 21>;
+ brcm,function = <6>; /* alt2 */
+ brcm,pull = <0>; /* no pull */
+ };
+ };
+ };
+};
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