From 57efdd6a2d815d2491c5b7f22ffaeb6a845bfd0a Mon Sep 17 00:00:00 2001 From: Ptilopsis Leucotis Date: Wed, 11 May 2022 19:55:05 +0300 Subject: [PATCH] ath79: fix I2C on GL-AR300M devices 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 --- target/linux/ath79/dts/qca9531_glinet_gl-ar300m.dtsi | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/target/linux/ath79/dts/qca9531_glinet_gl-ar300m.dtsi b/target/linux/ath79/dts/qca9531_glinet_gl-ar300m.dtsi index 2eaff61f50..47fda91a0c 100644 --- a/target/linux/ath79/dts/qca9531_glinet_gl-ar300m.dtsi +++ b/target/linux/ath79/dts/qca9531_glinet_gl-ar300m.dtsi @@ -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>; + }; +}; -- 2.30.2