From 72b90222c1a3a856875fba681041fa2f8a12b391 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Tue, 30 Jun 2015 09:10:36 +0100
Subject: [PATCH] BCM270X_DT: Overlay for the Fen Logic VGA666 board

The VGA666 board requires GPIOs 2-21 (so no I2C or UART). Using the
overlay (instead of a custom dt-blob.bin) has the advantage that it will
reserve those pins and stop other devices using them (except for GPIO),
but it does delay the point at which the output becomes valid until 2-3
seconds after the kernel has started.
---
 arch/arm/boot/dts/overlays/Makefile           |  1 +
 arch/arm/boot/dts/overlays/README             |  8 +++++
 arch/arm/boot/dts/overlays/vga666-overlay.dts | 30 +++++++++++++++++++
 3 files changed, 39 insertions(+)
 create mode 100644 arch/arm/boot/dts/overlays/vga666-overlay.dts

diff --git a/arch/arm/boot/dts/overlays/Makefile b/arch/arm/boot/dts/overlays/Makefile
index e91548c00d639..74ec825e0e0d7 100644
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -43,6 +43,7 @@ dtb-$(RPI_DT_OVERLAYS) += spi-bcm2708-overlay.dtb
 dtb-$(RPI_DT_OVERLAYS) += spi-bcm2835-overlay.dtb
 dtb-$(RPI_DT_OVERLAYS) += tinylcd35-overlay.dtb
 dtb-$(RPI_DT_OVERLAYS) += uart1-overlay.dtb
+dtb-$(RPI_DT_OVERLAYS) += vga666-overlay.dtb
 dtb-$(RPI_DT_OVERLAYS) += w1-gpio-overlay.dtb
 dtb-$(RPI_DT_OVERLAYS) += w1-gpio-pullup-overlay.dtb
 
diff --git a/arch/arm/boot/dts/overlays/README b/arch/arm/boot/dts/overlays/README
index 980d3583b2a36..5e1f530c6c817 100644
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -497,6 +497,14 @@ Params: txd1_pin                 GPIO pin for TXD1 (14, 32 or 40 - default 14)
         rxd1_pin                 GPIO pin for RXD1 (15, 33 or 41 - default 15)
 
 
+Name:   vga666
+Info:   Overlay for the Fen Logic VGA666 board
+        This uses GPIOs 2-21 (so no I2C), and activates the output 2-3 seconds
+        after the kernel has started.
+Load:   dtoverlay=vga666
+Params: <None>
+
+
 Name:   w1-gpio
 Info:   Configures the w1-gpio Onewire interface module.
         Use this overlay if you *don't* need a GPIO to drive an external pullup.
diff --git a/arch/arm/boot/dts/overlays/vga666-overlay.dts b/arch/arm/boot/dts/overlays/vga666-overlay.dts
new file mode 100644
index 0000000000000..7fcab963eb4ae
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/vga666-overlay.dts
@@ -0,0 +1,30 @@
+/dts-v1/;
+/plugin/;
+
+/{
+	compatible = "brcm,bcm2708";
+
+	// There is no VGA 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 = <&vga666_pins>;
+		};
+	};
+
+	fragment@1 {
+		target = <&gpio>;
+		__overlay__ {
+			vga666_pins: vga666_pins {
+				brcm,pins = <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 */
+			};
+		};
+	};
+};