ADS7846 touch screen doesn't work. unknown pin PL8 error.

[sas321sas]

Hi all! Could someone help me?
I am triying to setup Kedei 3.5 HDLCD touchscreen. I found a common example sunxi-DT-overlay for ads7846.

/dts-v1/;
/plugin/;

/ {
	compatible = "allwinner,sun4i-a10", "allwinner,sun7i-a20", "allwinner,sun8i-h3", "allwinner,sun50i-a64", "allwinner,sun50i-h5";

	fragment@0 {
		target = <&pio>;
		__overlay__ {
			ads7846_pins: ads7846_pins {
				pins= "PA7";
				function = "irq";
           		};
		};
	};

	fragment@1 {
		target = <&spi0>;
		__overlay__ {
			#address-cells = <1>;
			#size-cells = <0>;
			status = "okay";
			ads7846@0 {
				compatible = "ti,ads7846";
				reg = <0>; /* Chip Select 0 */
				status = "okay";
				pinctrl-names = "default";
				pinctrl-0 = <&ads7846_pins>;
				spi-max-frequency = <2000000>;
				interrupt-parent = <&pio>;
				interrupts = <0 7 2>; /* PA7 IRQ_TYPE_EDGE_FALLING */
				pendown-gpio = <&pio 0 7 0>; /* PA7 */

				/* driver defaults, optional */
				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>;
			};
		};
	};
};

 

I changed pin "PA7" with "PL8" and after reboot got such error:
[    9.788721] sun50i-h6-pinctrl 300b000.pinctrl: unknown pin PL8

Also I can't use other ports, PA and PH support interrupts, but PA is not exposed to the interface pins. All of PH occupated by SPI. PD does not support interrupts (got "no irq" error).

 

My dts:
 

/dts-v1/;
/plugin/;

/ {
        compatible = "allwinner,sun50i-h6";

        fragment@0 {
                target = <&pio>;
                __overlay__ {
                        ads7846_pins: ads7846_pins {
                                pins= "PL8";
                                function = "irq";
                        };
                };
        };

        fragment@1 {
                target = <&spi1>;
                __overlay__ {
                        #address-cells = <1>;
                        #size-cells = <0>;
                        status = "okay";
                        ads7846@0 {
                                compatible = "ti,ads7846";
                                reg = <0>; /* Chip Select 0 */
                                status = "okay";
                                pinctrl-names = "default";
                                pinctrl-0 = <&ads7846_pins>;
                                spi-max-frequency = <2000000>;
                                interrupt-parent = <&pio>;
                                interrupts = <11 8 2>; /* PL8 IRQ_TYPE_EDGE_FALLING */
                                pendown-gpio = <&pio 11 8 0>; /* PL8 */

                                /* driver defaults, optional */
                                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>;
                        };
                };
        };
};

 

Edited August 15, 2023 by sas321sas

[Gunjan Gupta]

try changing &pio to &r_pio when using PL8

[sas321sas]

@Gunjan Gupta, thanks for helping! 😄 It fixed the pl8 error.