arm64: dts: qcom: qrb2210-rb1: switch I2C2 to i2c-gpio

commit b7b545ccc08873e107aa24c461b1fdb123dd3761 upstream.

On the Qualcomm RB1 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: 616eda24edd4 ("arm64: dts: qcom: qrb2210-rb1: Set up HDMI")
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-v2-1-946f5d6b6948@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts b/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts
index 6e9dd0312adc5d369136fedbbd6166f7a6f7390c..a9ab924d2ed12da00467ef1f105acfe20d62e131 100644 (file)
--- a/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts
+++ b/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts
@@ -59,6 +59,17 @@
                };
        };
 
+       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";
 
@@ -199,7 +210,7 @@
        status = "okay";
 };
 
-&i2c2 {
+&i2c2_gpio {
        clock-frequency = <400000>;
        status = "okay";