openwrt_lede/target/linux/brcm2708/patches-4.4/0238-BCM270X_DT-Add-dpi24-overlay.patch

From 8f6cc1607cb38e53b0638be389fceaafb48b3f34 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Tue, 5 Apr 2016 13:01:54 +0100
Subject: [PATCH] BCM270X_DT: Add dpi24 overlay

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 arch/arm/boot/dts/overlays/Makefile          |  1 +
 arch/arm/boot/dts/overlays/README            |  8 +++++++
 arch/arm/boot/dts/overlays/dpi24-overlay.dts | 31 ++++++++++++++++++++++++++++
 3 files changed, 40 insertions(+)
 create mode 100644 arch/arm/boot/dts/overlays/dpi24-overlay.dts

--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -15,6 +15,7 @@ endif
 dtbo-$(RPI_DT_OVERLAYS) += ads7846.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += at86rf233.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += bmp085_i2c-sensor.dtbo
+dtbo-$(RPI_DT_OVERLAYS) += dpi24.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += dwc2.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += dwc-otg.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += dht11.dtbo
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -213,6 +213,14 @@ Params: gpiopin                 GPIO con
                                 (default 4)
 
 
+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
+        2-3 seconds after the kernel has started.
+Load:   dtoverlay=dpi24
+Params: <None>
+
+
 Name:   dwc-otg
 Info:   Selects the dwc_otg USB controller driver which has fiq support. This
         is the default on all except the Pi Zero which defaults to dwc2.
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/dpi24-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 = <&dpi24_pins>;
+		};
+	};
+
+	fragment@1 {
+		target = <&gpio>;
+		__overlay__ {
+			dpi24_pins: dpi24_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 22 23 24 25 26 27>;
+				brcm,function = <6>; /* alt2 */
+				brcm,pull = <0>; /* no pull */
+			};
+		};
+	};
+};