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// SPDX-License-Identifier: GPL-2.0+
/*
* device tree overlay for a goodtft mhs-3.5 raspberry pi spi display.
*
* for touch, see `./mhs35-touch-overlay.dts`!
*
* Copyright (c) 2026 Mel G. <mel@rnrd.eu>
*/
/dts-v1/;
/plugin/;
/ {
compatible = "brcm,bcm2711";
fragment@0 {
target = <&spi0>;
__overlay__ {
status = "okay";
spidev@0 {
status = "disabled";
};
};
};
fragment@1 {
target = <&gpio>;
__overlay__ {
mhs35_pins: mhs35_pins@0 {
brcm,pins = <25 24>; // reset, dc
brcm,function = <0 0>;
};
};
};
fragment@2 {
target = <&spi0>;
__overlay__ {
#address-cells = <1>;
#size-cells = <0>;
mhs35: mhs35@0 {
compatible = "goodtft,mhs35";
reg = <0>;
pinctrl-names = "default";
pinctrl-0 = <&mhs35_pins>;
// very conservative default that works pretty well,
// though is quite slow (you can see the screen update!)
// according to spec, should go upto 125mhz.
spi-max-frequency = <8000000>;
// orientation relative to a raspberry pi 4:
// 0 = landscape, usb/ethernet ports on left
// 180 = landscape, ports on right
// 90 = portrait, ports on top
// 270 portrait, ports on bottom
rotation = <180>;
reset-gpios = <&gpio 25 1>;
dc-gpios = <&gpio 24 0>;
};
};
};
__overrides__ {
speed = <&mhs35>,"spi-max-frequency:0";
rotation = <&mhs35>,"rotation:0";
};
};
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