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From 4cbd4845d011a08deb7d68956931f26011f3221e Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Tue, 30 Jun 2015 09:10:36 +0100
Subject: [PATCH 107/171] 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
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -43,6 +43,7 @@ dtb-$(RPI_DT_OVERLAYS) += spi-bcm2708-ov
dtb-$(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
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -497,6 +497,14 @@ Params: txd1_pin GPIO pi
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.
--- /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 */
+ };
+ };
+ };
+};
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