Good afternoon! I'm trying to use TSC2046 based touchscreen device on a STM32MP157C-DK2 based custom board. I get SPI transfer time-out when touching the screen. Does anyone have a similar problem ?
I'm using spi5 and my device tree settings are
&spi5 {
pinctrl-names = "default", "sleep";
pinctrl-0 = <&spi5_pins_a>;
pinctrl-1 = <&spi5_sleep_pins_a>;
#address-cells = <1>;
#size-cells = <0>;
num-cs = <1>;
is-decoded-cs = <0>;
cs-gpios = <&gpiof 6 GPIO_ACTIVE_LOW>;
/delete-property/dma-names;
/delete-property/dmas;
status = "okay";
tsc2046@0 {
reg = <0>; // CS0
compatible = "ti,tsc2046";
interrupt-parent = <&gpiof>;
interrupts = <10 2>;
interrupt-controller;
spi-max-frequency = <1000000>;
pendown-gpio = <&gpiof 10 0>;
vcc-supply = <&v3v3>;
touchscreen-size-x = <1024>;
touchscreen-size-y = <600>;
wakeup-source;
status = "okay";
};
};
The driver of the touch screen is ADS7846. It's currently in-build. Something wrong in the device tree ?
Some more info. The chip select line seems to be inverted for some reason. Checking with oscilloscope it goes high during spi transaction. It should be low with ads7846 chip.