77 lines
2.5 KiB
Diff
77 lines
2.5 KiB
Diff
From ee874bae0042910abccd54b90e411a852b4569ef Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Tue, 30 Jun 2015 09:10:36 +0100
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Subject: [PATCH 107/148] BCM270X_DT: Overlay for the Fen Logic VGA666 board
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The VGA666 board requires GPIOs 2-21 (so no I2C or UART). Using the
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overlay (instead of a custom dt-blob.bin) has the advantage that it will
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reserve those pins and stop other devices using them (except for GPIO),
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but it does delay the point at which the output becomes valid until 2-3
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seconds after the kernel has started.
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---
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arch/arm/boot/dts/overlays/Makefile | 1 +
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arch/arm/boot/dts/overlays/README | 8 +++++++
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arch/arm/boot/dts/overlays/vga666-overlay.dts | 30 +++++++++++++++++++++++++++
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3 files changed, 39 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/vga666-overlay.dts
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -43,6 +43,7 @@ dtb-$(RPI_DT_OVERLAYS) += spi-bcm2708-ov
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dtb-$(RPI_DT_OVERLAYS) += spi-bcm2835-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += tinylcd35-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += uart1-overlay.dtb
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+dtb-$(RPI_DT_OVERLAYS) += vga666-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += w1-gpio-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += w1-gpio-pullup-overlay.dtb
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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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@@ -497,6 +497,14 @@ Params: txd1_pin GPIO pi
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rxd1_pin GPIO pin for RXD1 (15, 33 or 41 - default 15)
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+Name: vga666
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+Info: Overlay for the Fen Logic VGA666 board
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+ This uses GPIOs 2-21 (so no I2C), and activates the output 2-3 seconds
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+ after the kernel has started.
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+Load: dtoverlay=vga666
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+Params: <None>
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+
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+
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Name: w1-gpio
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Info: Configures the w1-gpio Onewire interface module.
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Use this overlay if you *don't* need a GPIO to drive an external pullup.
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/vga666-overlay.dts
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@@ -0,0 +1,30 @@
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+/dts-v1/;
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+/plugin/;
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+
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+/{
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+ compatible = "brcm,bcm2708";
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+
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+ // There is no VGA driver module, but we need a platform device
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+ // node (that doesn't already use pinctrl) to hang the pinctrl
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+ // reference on - leds will do
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+
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+ fragment@0 {
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+ target = <&leds>;
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+ __overlay__ {
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+ pinctrl-names = "default";
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+ pinctrl-0 = <&vga666_pins>;
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&gpio>;
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+ __overlay__ {
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+ vga666_pins: vga666_pins {
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+ brcm,pins = <2 3 4 5 6 7 8 9 10 11 12
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+ 13 14 15 16 17 18 19 20 21>;
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+ brcm,function = <6>; /* alt2 */
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+ brcm,pull = <0>; /* no pull */
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+ };
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+ };
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+ };
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+};
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