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raspberry-pi/4: Add touch support for official 7" display.

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Frédéric Christ 2023-03-26 20:00:39 +02:00
parent f38f9a4c9b
commit bd6381e513
1 changed files with 65 additions and 0 deletions
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raspberry-pi/4/touch-ft5406.nix Normal file
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{ config, lib, ... }:
let
cfg = config.hardware.raspberry-pi."4".touch-ft5406;
in
{
options.hardware = {
raspberry-pi."4".touch-ft5406 = {
enable = lib.mkEnableOption ''
Enable the touch controller of the official Raspberry Pi touch diplay.
The overlay is taken from the official Raspberry Pi Linux fork, and
the `compatible` field is updated to match the target device tree.
https://github.com/raspberrypi/linux/blob/14b35093ca68bf2c81bbc90aace5007142b40b40/arch/arm/boot/dts/overlays/rpi-ft5406-overlay.dts
For more information about the touch display, please refer to:
https://www.raspberrypi.com/documentation/accessories/display.html
'';
};
};
config = lib.mkIf cfg.enable {
# Configure for modesetting in the device tree
hardware.deviceTree = {
overlays = [
# this *should* be equivalent to (which doesn't work):
# https://github.com/raspberrypi/linux/blob/rpi-5.10.y/arch/arm/boot/dts/overlays/dwc2-overlay.dts
# but actually it's obtained using
# dtc -I dtb -O dts ${config.hardware.deviceTree.kernelPackage}/dtbs/overlays/dwc2.dtbo
# (changes: modified top-level "compatible" field)
# which is slightly different and works
{
name = "rpi-ft5406-overlay";
dtsText = ''
/dts-v1/;
/plugin/;
/ {
compatible = "brcm,bcm2711";
fragment@0 {
target-path = "/soc/firmware";
__overlay__ {
ts: touchscreen {
compatible = "raspberrypi,firmware-ts";
touchscreen-size-x = <800>;
touchscreen-size-y = <480>;
};
};
};
__overrides__ {
touchscreen-size-x = <&ts>,"touchscreen-size-x:0";
touchscreen-size-y = <&ts>,"touchscreen-size-y:0";
touchscreen-inverted-x = <&ts>,"touchscreen-inverted-x?";
touchscreen-inverted-y = <&ts>,"touchscreen-inverted-y?";
touchscreen-swapped-x-y = <&ts>,"touchscreen-swapped-x-y?";
};
};
'';
}
];
};
};
}