How to add TSC2046 in STM32MP151AAC?

[yrkim05]

Dear All,

We have been using LCD module which supports touch screen.

Currently image can be displayed properly.

I just started debugging touch screen.

we use SPI2 to interface to touch screen ic, TSC2046.

This is setting spi2 in dts.

&spi2 {

pinctrl-names = "default", "sleep";

pinctrl-0 = <&spi2_pins_a>;

pinctrl-1 = <&spi2_sleep_pins_a>;

cs-gpios = <&gpioi 0 0>;

status = "okay";

//spidev@0 {     

    //    compatible = "spidev";

    //    spi-max-frequency = <20000000>;

    //    reg = <0>;

    //};

    ads7846@0 {

                compatible = "ti,ads7846";

                reg = <0x0>;

                spi-max-frequency = <1000000>;

                interrupt-parent = <&gpioe>;

                interrupts = <12 IRQ_TYPE_EDGE_FALLING>;

                //gpios = <&gpioe 12 0>;

                pendown-gpio = <&gpioe 12 0>; /*GPIOE 12*/

                //ti,x-min = /bits/ 16 <0>;

                //ti,x-max = /bits/ 16 <2400>;

                //ti,y-min = /bits/ 16 <0>;

                //ti,y-max = /bits/ 16 <3200>;

                //ti,x-plate-ohms = /bits/ 16 <40>;

                //ti,pressure-max = /bits/ 16 <255>;

touchscreen-size-x = <240>;

touchscreen-size-y = <320>;

                wakeup-source;

                status = "okay";

    };

};

1. configure ADS7846 as 'M' by menuconfig

2. build kernel

3. update dtb and uimage

4. cp ads7846.ko to /lib/

I'm considering getting event through reading "/dev/input/event"

Could you advise how to make touch screen work?

Best wishes,

KIM

[yrkim05]

I change dts for spi2 as below.

&spi2 {

pinctrl-names = "default", "sleep";

pinctrl-0 = <&spi2_pins_a>;

pinctrl-1 = <&spi2_sleep_pins_a>;

cs-gpios = <&gpioi 0 0>;

status = "okay";

//spidev@0 {     

    //    compatible = "spidev";

    //    spi-max-frequency = <20000000>;

    //    reg = <0>;

    //};

    ads7846@0 {

                compatible = "ti,ads7846";

                reg = <0x0>;

                spi-max-frequency = <1500000>;

                interrupt-parent = <&gpioe>;

                interrupts = <12 IRQ_TYPE_EDGE_FALLING>;

                //gpios = <&gpioe 12 0>;

                pendown-gpio = <&gpioe 12 0>; /*GPIOE 12*/

                ti,x-min = /bits/ 16 <0>;

                ti,x-max = /bits/ 16 <2400>;

                ti,y-min = /bits/ 16 <0>;

                ti,y-max = /bits/ 16 <3200>;

                ti,x-plate-ohms = /bits/ 16 <180>;

                ti,pressure-max = /bits/ 16 <255>;

                ti,debounce-max = /bits/ 16 <10>;

                ti,debounce-tol = /bits/ 16 <30>;

                ti,debounce-rep = /bits/ 16 <1>;

                ti,settle-delay-usec = /bits/ 16 <150>;

                ti,keep-vref-on = <1>;

//touchscreen-size-x = <240>;

//touchscreen-size-y = <320>;

                wakeup-source;

                status = "okay";

    };

};

I try to read event by "/dev/input/touchscreen0" but nothing is read.

I check interrupt signal by scope, driven as low when press lcd.

What shall I need to check?

[yrkim05]

I checked input device by /proc/bus/input/devices.

Touchscreen is event2 handler, spi0.0/input0.

So I tried to check event by evtest but nothing happens.

What shall I need to check?