ADS7846 wont probe spi3.0 on rk3566

[qNnOtTk]

ADS7846 wont probe spi3.0 on rk3566

[notro]

modalias is used for autoloading driver modules.
Make sure that the device has been added (this is for another driver) and that the modalias matches the one in the driver:

$ cat /sys/bus/spi/devices/spi0.0/modalias
spi:mi0283qt

$ modinfo mi0283qt
[...]
alias:          spi:mi0283qt
[...]

[qNnOtTk]

it isn't, but i have added it in /etc/modules anyway and it works fine now
even though fbtft works now, ads7846 doesn't want to
I keep getting this error in dmesg

ads7846: probe of spi3.0 failed with error -22

*if you're wondering why its looking for spi3.0, that's because im not using a raspberry pi, but a rock CM3 from radxa. I have connected it to the cm4io board, and the spi3 bus is located on the 40 gpio pin headers which im using for the screen, more on the cm3: https://wiki.radxa.com/Rock3/CM/CM3 *

its connected to CS0, this is the dts file i used

``
/dts-v1/;
/plugin/;

/ {
compatible = "radxa,radxa-cm3-io", "rockchip,rk3566";

    fragment@0 {
            target = <&spi3>;
            __overlay__ {
                    #address-cells = <1>;
                    #size-cells = <0>;
                    ads7846@0 {
                            compatible = "ti,ads7846";
                            reg = <0>;
                            pinctrl-names = "default";
                            pinctrl-0 = <&spi3m0_cs0 &spi3m0_pins>;
                            spi-max-frequency = <50000000>;
                            interrupts = <255 2>;
                            interrupt-parent = <&gpio0>;
                            pendown-gpio = <&gpio0 18 0>;
                            ti,x-min = [00 00];
                            ti,y-min = [00 00];
                            ti,x-max = [0f ff];
                            ti,y-max = [0f ff];
                            ti,pressure-min = [00 00];
                            ti,pressure-max = [ff ff];
                            ti,x-plate-ohms = [01 90];
                    };
            };
};

};
``

[notro]

You run the SPI clock at 50MHz, I don't think the chip can handle that. The rPi overlay uses 2MHz.

[qNnOtTk]

I have realized that the reason it can't probe spi is because of this

Pin gpio4-6 (a.k.a. SPI3 CS0) is already occupied

[qNnOtTk]

nevermind touchscreen works now, here is overlay i used
`
/dts-v1/;
/plugin/;

/ {
compatible = "radxa,radxa-cm3-io", "rockchip,rk3566";

    fragment@0 {
            target = <&spi3>;

            __overlay__ {
                    status = "okay";
            };
    };



    fragment@1 {
            target = <&gpio0>;
                    __overlay__{
                            ads7846_pins: ads7846_pins {
                                    rockchip,pins = <0 18 0 &pcfg_pull_up>;
                                    };
                    };
            };

    fragment@2 {
            target = <&spi3>;
            __overlay__ {
                    /* needed to avoid dtc warning */
                    #address-cells = <1>;
                    #size-cells = <0>;

                    ads7846: ads7846@0 {
                            compatible = "ti,ads7846";
                            reg = <0>;
                            spi-max-frequency = <2000000>;
                            interrupts = <18 2>; /* high-to-low edge triggered */
                            interrupt-parent = <&gpio0>;
                            pendown-gpio = <&gpio0 18 0>;

                            /* driver defaults */
                            ti,x-min = /bits/ 16 <0>;
                            ti,y-min = /bits/ 16 <0>;
                            ti,x-max = /bits/ 16 <0x0FFF>;
                            ti,y-max = /bits/ 16 <0x0FFF>;
                            ti,pressure-min = /bits/ 16 <0>;
                            ti,pressure-max = /bits/ 16 <0xFFFF>;
                            ti,x-plate-ohms = /bits/ 16 <400>;
                    };
            };
    };

};
`