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overlays: Add dpi18 overlay (#1634)

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Add support for 18-bit DPI displays. Although the dpi24 overlay could
be used, this overlay leaves GPIOs 22-27 free for other uses.
This commit is contained in:
Phil Elwell
2016-09-12 13:46:56 +01:00
committed by GitHub
parent 73bada585a
commit 7b8f544027
3 changed files with 40 additions and 0 deletions
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1
arch/arm/boot/dts/overlays/Makefile
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@@ -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

8
arch/arm/boot/dts/overlays/README
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@@ -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

31
arch/arm/boot/dts/overlays/dpi18-overlay.dts Normal file
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@@ -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 */
};
};
};
};