1. Article purpose[edit source]
The purpose of this article is to:
- list the touchscreen hardware components that might be integrated in the different boards
- link these components to the corresponding software framework(s)
- point to the datasheet(s) of these components
- explain, when necessary, how to configure these components
2. Software frameworks[edit source]
Domain | Peripheral | Software components | Comment | ||
---|---|---|---|---|---|
OP-TEE | Linux | STM32Cube | |||
Visual and Inputs | Goodix GT9147 | Inputs framework[1] | Touchscreen input driver | ||
Visual and Inputs | FocalTech FT6236 | Inputs framework[1] | Touchscreen input driver |
3. Goodix GT9147[edit source]
The Goodix GT9147 is a single-layer multi-touch capacitive touch controller driver.
For details and the datasheet please contact the GT9147 driver provider.
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This touchscreen controller driver can be found on some STM32MP15 Evaluation boards. |
3.1. Linux driver[edit source]
Bindings: Documentation/devicetree/bindings/input/touchscreen/goodix.yaml
Sources: drivers/input/touchscreen/goodix.c
Devicetree example: arch/arm/boot/dts/stm32mp157d-ev1.dts
...
&dsi {
#address-cells = <1>;
#size-cells = <0>;
status = "okay";
ports {
#address-cells = <1>;
#size-cells = <0>;
port@0 {
reg = <0>;
dsi_in: endpoint {
remote-endpoint = <<dc_ep0_out>;
};
};
port@1 {
reg = <1>;
dsi_out: endpoint {
remote-endpoint = <&dsi_panel_in>;
};
};
};
panel_dsi: panel-dsi@0 {
compatible = "raydium,rm68200";
reg = <0>;
reset-gpios = <&gpiof 15 GPIO_ACTIVE_LOW>;
backlight = <&panel_backlight>;
power-supply = <&v3v3>;
status = "okay";
port {
dsi_panel_in: endpoint {
remote-endpoint = <&dsi_out>;
};
};
};
};
&i2c2 {
...
stmfx: stmfx@42 {
compatible = "st,stmfx-0300";
reg = <0x42>;
interrupts = <8 IRQ_TYPE_EDGE_RISING>;
interrupt-parent = <&gpioi>;
vdd-supply = <&v3v3>;
stmfx_pinctrl: pinctrl {
compatible = "st,stmfx-0300-pinctrl";
gpio-controller;
#gpio-cells = <2>;
interrupt-controller;
#interrupt-cells = <2>;
gpio-ranges = <&stmfx_pinctrl 0 0 24>;
goodix_pins: goodix {
pins = "gpio14";
bias-pull-down;
};
joystick_pins: joystick-pins {
pins = "gpio0", "gpio1", "gpio2", "gpio3", "gpio4";
bias-pull-down;
};
};
};
gt9147: goodix-ts@5d {
compatible = "goodix,gt9147";
reg = <0x5d>;
panel = <&panel_dsi>;
pinctrl-0 = <&goodix_pins>;
pinctrl-names = "default";
AVDD28-supply = <&v3v3>;
VDDIO-supply = <&v3v3>;
status = "okay";
interrupts = <14 IRQ_TYPE_EDGE_RISING>;
interrupt-parent = <&stmfx_pinctrl>;
};
};
4. FocalTech FT6236[edit source]
The FocalTech FT6236 is a self-capacitive touch panel controller driver.
For details and the datasheet please contact the FT6236 driver provider.
4.1. Linux driver[edit source]
Bindings: Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.yaml
Sources: drivers/input/touchscreen/edt-ft5x06.c
5. References[edit source]
- ↑ 1.0 1.1 Linux Input Subsystem kernel API and userspace API