76 lines
2.3 KiB
Diff
76 lines
2.3 KiB
Diff
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From 654ea8a724a4abaf000841788cec8f90756682a7 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <pelwell@users.noreply.github.com>
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Date: Mon, 12 Sep 2016 13:46:56 +0100
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Subject: [PATCH] overlays: Add dpi18 overlay (#1634)
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Add support for 18-bit DPI displays. Although the dpi24 overlay could
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be used, this overlay leaves GPIOs 22-27 free for other uses.
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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/dpi18-overlay.dts | 31 ++++++++++++++++++++++++++++
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3 files changed, 40 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/dpi18-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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@@ -22,6 +22,7 @@ dtbo-$(RPI_DT_OVERLAYS) += audremap.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += bmp085_i2c-sensor.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += dht11.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += dionaudio-loco.dtbo
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+dtbo-$(RPI_DT_OVERLAYS) += dpi18.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += dpi24.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += dwc-otg.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += dwc2.dtbo
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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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@@ -283,6 +283,14 @@ Load: dtoverlay=dionaudio-loco
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Params: <None>
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+Name: dpi18
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+Info: Overlay for a generic 18-bit DPI display
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+ This uses GPIOs 0-21 (so no I2C, uart etc.), and activates the output
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+ 2-3 seconds after the kernel has started.
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+Load: dtoverlay=dpi18
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+Params: <None>
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+
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+
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Name: dpi24
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Info: Overlay for a generic 24-bit DPI display
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This uses GPIOs 0-27 (so no I2C, uart etc.), and activates the output
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/dpi18-overlay.dts
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@@ -0,0 +1,31 @@
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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 DPI 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 = <&dpi18_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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+ dpi18_pins: dpi18_pins {
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+ brcm,pins = <0 1 2 3 4 5 6 7 8 9 10 11
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+ 12 13 14 15 16 17 18 19 20
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+ 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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