arm64: dts: qcom: qrb4210-rb2: switch I2C2 to i2c-gpio

On the Qualcomm RB2 platform the I2C bus connected to the LT9611UXC
bridge under some circumstances can go into a state when all transfers
timeout. This causes both issues with fetching of EDID and with
updating of the bridge's firmware. While we are debugging the issue,
switch corresponding I2C bus to use i2c-gpio driver. While using
i2c-gpio no communication issues are observed.

This patch is asusmed to be a temporary fix, so it is implemented in a
non-intrusive manner to simply reverting it later.

Fixes: f7b01e07e89c ("arm64: dts: qcom: qrb4210-rb2: Enable display out")
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org>
Link: https://lore.kernel.org/r/20240605-rb12-i2c2g-pio-v2-2-946f5d6b6948@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

diff --git a/arch/arm64/boot/dts/qcom/qrb4210-rb2.dts b/arch/arm64/boot/dts/qcom/qrb4210-rb2.dts
index 2c39bb1b97db5121f0e0e9c3d660df5390b561ac..cb8a62714a30265f6cb30538f9dd63c7eb9b20ab 100644 (file)
--- a/arch/arm64/boot/dts/qcom/qrb4210-rb2.dts
+++ b/arch/arm64/boot/dts/qcom/qrb4210-rb2.dts
@@ -60,6 +60,17 @@
                };
        };
 
+       i2c2_gpio: i2c {
+               compatible = "i2c-gpio";
+
+               sda-gpios = <&tlmm 6 GPIO_ACTIVE_HIGH>;
+               scl-gpios = <&tlmm 7 GPIO_ACTIVE_HIGH>;
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               status = "disabled";
+       };
+
        leds {
                compatible = "gpio-leds";
 
@@ -190,7 +201,7 @@
        };
 };
 
-&i2c2 {
+&i2c2_gpio {
        clock-frequency = <400000>;
        status = "okay";