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ath79: fix I2C on GL-AR300M devices

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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>
This commit is contained in:
Ptilopsis Leucotis 2022-05-11 19:55:05 +03:00 committed by Christian Lamparter
parent 3e300e724b
commit 57efdd6a2d
1 changed files with 9 additions and 0 deletions
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9
target/linux/ath79/dts/qca9531_glinet_gl-ar300m.dtsi
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@ -72,6 +72,9 @@
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)>;
};
@ -181,3 +184,9 @@
reg = <0x0 0x6>;
};
};
&pinmux {
enable_gpio17: pinmux_enable_gpio17 {
pinctrl-single,bits = <0x10 0x0000 0xff00>;
};
};