On GL-AR300M Series GPIO17 described as I2C SDA in Device Tree.
Because of GPIO_OUT_FUNCTION4 register was not initialized on start,
GPIO17 was uncontrollable, it always in high state. According to QCA9531
documentation, default setting of GPIO17 is SYS_RST_L. In order to make
GPIO17 controllable, it should write value 0x00 on bits [15:8] of
GPIO_OUT_FUNCTION4 register, located at 0x1804003C address.
Signed-off-by: Ptilopsis Leucotis <PtilopsisLeucotis@yandex.com>
i2c: i2c {
compatible = "i2c-gpio";
+ pinctrl-names = "default";
+ pinctrl-0 = <&enable_gpio17>;
+
sda-gpios = <&gpio 17 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
scl-gpios = <&gpio 16 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
};
reg = <0x0 0x6>;
};
};
+
+&pinmux {
+ enable_gpio17: pinmux_enable_gpio17 {
+ pinctrl-single,bits = <0x10 0x0000 0xff00>;
+ };
+};