Issue with gpio-export on we826-e

For Developers
1

Hi All,
I’m trying to compile OpenWRT 21.04 for a ZBTLink WE826-E (MT7620A-based) using the following custom DTS, but as soon as the GPIO-export driver probes, I get errors like “pin 13 is not set to gpio mux” and “0 gpio(s) exported.” As a result, none of exported GPIO appear under /sys/class/gpio, and the entire GPIO subnodes fail with error –22. I suspect I’m misconfiguring the pinctrl override—but I’m not sure.

can anyone please help.

/dts-v1/;

#include "mt7620a.dtsi"

#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/input/input.h>

/ {
	compatible = "zbtlink,zbt-we826-32m", "zbtlink,zbt-we826", "ralink,mt7620a-soc";
	model = "Zbtlink ZBT-WE826 (32M)";

	chosen {
		bootargs = "console=ttyS0,115200";
	};

	gpio-leds {
		compatible = "gpio-leds";
		4g {
			label = "4g";
			gpios = <&gpio0 9 GPIO_ACTIVE_LOW>;
		};
		sim1 {
			label = "sim1";
			gpios = <&gpio0 11 GPIO_ACTIVE_LOW>;
		};
		sim2 {
			label = "sim2";
			gpios = <&gpio0 12 GPIO_ACTIVE_LOW>;
		};
		ra0 {
			label = "ra0";
			gpios = <&gpio3 0 GPIO_ACTIVE_LOW>;
		};
	};

	gpio_export {
		compatible = "gpio-export";
		#size-cells = <0>;

		4g {
			gpio-export,name = "4g";
			gpio-export,output = <1>;
			gpios = <&gpio0 14 GPIO_ACTIVE_HIGH>;
		};
		sim {
			gpio-export,name = "sim";
			gpio-export,output = <0>;
			gpios = <&gpio0 13 GPIO_ACTIVE_LOW>;
		};
	};

	gpio-keys-polled {
		compatible = "gpio-keys-polled";
		#address-cells = <1>;
		#size-cells = <0>;
		poll-interval = <20>;
		reset {
			label = "reset";
			gpios = <&gpio0 1 1>;
			linux,code = <KEY_RESTART>;
		};
	};
};

&gpio0 {
	status = "okay";
};

&gpio1 {
	status = "okay";
};

&gpio3 {
	status = "okay";
};

&spi0 {
	status = "okay";

	flash@0 {
		compatible = "jedec,spi-nor";
		reg = <0>;
		spi-max-frequency = <10000000>;
		broken-flash-reset;

		partitions {
			compatible = "fixed-partitions";
			#address-cells = <1>;
			#size-cells = <1>;

			partition@0 {
				label = "u-boot";
				reg = <0x0 0x30000>;
				read-only;
			};

			partition@30000 {
				label = "u-boot-env";
				reg = <0x30000 0x10000>;
				read-only;
			};

			factory: partition@40000 {
				label = "factory";
				reg = <0x40000 0x10000>;
			};

			firmware: partition@50000 {
				compatible = "denx,uimage";
				label = "firmware";
				reg = <0x50000 0x1fb0000>;
			};
		};
	};
};


&sdhci {
	status = "okay";
};

&ehci {
	status = "okay";
};

&ohci {
	status = "okay";
};

&ethernet {
	mtd-mac-address = <&factory 0x28>;
	mediatek,portmap = "wllll";
};

&wmac {
	ralink,mtd-eeprom = <&factory 0>;
};

&pinctrl {
	state_default: pinctrl0 {
		default {
			ralink,group = "i2c", "uartf", "wled", "spi refclk", "pa";
			ralink,function = "gpio";
		};
	};
};

&pcie {
	status = "okay";
};

Logs on ROuter

openwrt@openwrt:/sys/class/gpio# dmesg | grep gpio
[    0.477594] rt2880_gpio 10000600.gpio: registering 24 gpios
[    0.488656] rt2880_gpio 10000600.gpio: registering 24 irq handlers
[    0.501264] rt2880_gpio 10000638.gpio: registering 16 gpios
[    0.512284] rt2880_gpio 10000638.gpio: registering 16 irq handlers
[    0.524893] rt2880_gpio 10000688.gpio: registering 1 gpios
[    0.535736] rt2880_gpio 10000688.gpio: registering 1 irq handlers
[    0.784076] rt2880-pinmux pinctrl: pin 14 is not set to gpio mux
[    0.818945] rt2880-pinmux pinctrl: pin 13 is not set to gpio mux
[    0.853876] gpio-export gpio_export: 0 gpio(s) exported
[    7.416933] rt2880-pinmux pinctrl: pin 1 is not set to gpio mux
[    7.434698] gpio-keys-polled: probe of gpio-keys-polled failed with error -22
[    7.622261] rt2880-pinmux pinctrl: pin 9 is not set to gpio mux
[    7.640036] leds-gpio: probe of gpio-leds failed with error -22
2

Check the datasheet of the SoC and find out which pin groups these pins are in. Then add this pin group to your pinctrl array.

1 Like
3

If I'm not mistaken starting from openwrt version 21 you must use groups and function instead of ralink,group and ralink,function for default gpio config.

4

You're probably right. Pins 13 and 14 are in the "uartf" group, which is already in the pinctrl array.

5

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