When i2c bus SCL/SDA are stuck low during transfer, the i2c
pinctrl should be configured to gpio mode to do bus recovery.
Genenally, we can use sleep state for bus recovery. But it's
not a good choice to use sleep state here because it will be
confused. This patch introduces a dedicated gpio state.
Signed-off-by: Fugang Duan <B38611@xxxxxxxxxxxxx>
Signed-off-by: Gao Pan <b54642@xxxxxxxxxxxxx>
---
arch/arm/boot/dts/imx6qdl-sabresd.dtsi | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/arch/arm/boot/dts/imx6qdl-sabresd.dtsi b/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
index 944eb81..6e97018 100644
--- a/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
@@ -172,8 +172,11 @@
&i2c1 {
clock-frequency = <100000>;
- pinctrl-names = "default";
+ pinctrl-names = "default", "gpio";
pinctrl-0 = <&pinctrl_i2c1>;
+ pinctrl-1 = <&pinctrl_i2c1_gpio>;
+ scl-gpios = <&gpio5 26 0>;
+ sda-gpios = <&gpio5 27 0>;
status = "okay";
codec: wm8962@1a {
@@ -393,6 +396,13 @@
>;
};
+ pinctrl_i2c1_gpio: i2c1grp_gpio {
+ fsl,pins = <
+ MX6QDL_PAD_CSI0_DAT8__GPIO5_IO26 0x1b0b0
+ MX6QDL_PAD_CSI0_DAT9__GPIO5_IO27 0x1b0b0
+ >
+ };
+
pinctrl_i2c2: i2c2grp {
fsl,pins = <
MX6QDL_PAD_KEY_COL3__I2C2_SCL 0x4001b8b1
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe linux-i2c" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
