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- From 654ea8a724a4abaf000841788cec8f90756682a7 Mon Sep 17 00:00:00 2001
- From: Phil Elwell <pelwell@users.noreply.github.com>
- Date: Mon, 12 Sep 2016 13:46:56 +0100
- Subject: [PATCH] overlays: Add dpi18 overlay (#1634)
- Add support for 18-bit DPI displays. Although the dpi24 overlay could
- be used, this overlay leaves GPIOs 22-27 free for other uses.
- ---
- arch/arm/boot/dts/overlays/Makefile | 1 +
- arch/arm/boot/dts/overlays/README | 8 +++++++
- arch/arm/boot/dts/overlays/dpi18-overlay.dts | 31 ++++++++++++++++++++++++++++
- 3 files changed, 40 insertions(+)
- create mode 100644 arch/arm/boot/dts/overlays/dpi18-overlay.dts
- --- a/arch/arm/boot/dts/overlays/Makefile
- +++ b/arch/arm/boot/dts/overlays/Makefile
- @@ -22,6 +22,7 @@ dtbo-$(RPI_DT_OVERLAYS) += audremap.dtbo
- dtbo-$(RPI_DT_OVERLAYS) += bmp085_i2c-sensor.dtbo
- dtbo-$(RPI_DT_OVERLAYS) += dht11.dtbo
- dtbo-$(RPI_DT_OVERLAYS) += dionaudio-loco.dtbo
- +dtbo-$(RPI_DT_OVERLAYS) += dpi18.dtbo
- dtbo-$(RPI_DT_OVERLAYS) += dpi24.dtbo
- dtbo-$(RPI_DT_OVERLAYS) += dwc-otg.dtbo
- dtbo-$(RPI_DT_OVERLAYS) += dwc2.dtbo
- --- a/arch/arm/boot/dts/overlays/README
- +++ b/arch/arm/boot/dts/overlays/README
- @@ -283,6 +283,14 @@ Load: dtoverlay=dionaudio-loco
- Params: <None>
-
-
- +Name: dpi18
- +Info: Overlay for a generic 18-bit DPI display
- + This uses GPIOs 0-21 (so no I2C, uart etc.), and activates the output
- + 2-3 seconds after the kernel has started.
- +Load: dtoverlay=dpi18
- +Params: <None>
- +
- +
- 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
- --- /dev/null
- +++ b/arch/arm/boot/dts/overlays/dpi18-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 = <&dpi18_pins>;
- + };
- + };
- +
- + fragment@1 {
- + target = <&gpio>;
- + __overlay__ {
- + dpi18_pins: dpi18_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>;
- + brcm,function = <6>; /* alt2 */
- + brcm,pull = <0>; /* no pull */
- + };
- + };
- + };
- +};
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