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 ?

[Ronte.1]

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.

[Ronte.1]

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 (and tsc2046) chip.

[PatrickF]

follow-up on https://community.st.com/s/question/0D53W00000MBI9SSAX

[ZLiu.3]

hey, is your problem solved?

[Ronte.1]

Well, we changed the chip to TSC2007 and used i2c control. It solved that problem. BR Raimo Sent from Mail<> for Windows