GPIO lines for the CM36651 sensor I2C bus use the normal not the inverted polarity. This bug has been there since adding the CM36651 sensor by commit 85cb4e0bd2294, but went unnoticed because the "i2c-gpio" driver ignored the GPIO polarity specified in the device-tree.
The recent conversion of "i2c-gpio" driver to the new, descriptor based GPIO API, automatically made it the DT-specified polarity aware, what broke the CM36651 sensor operation.
Fixes: c769eaf7a85d ("ARM: dts: exynos: Split Trats2 DTS in preparation for Midas boards") Fixes: c10d3290cbde ("ARM: dts: Use GPIO constants for flags cells in exynos4412 boards") Fixes: 85cb4e0bd229 ("ARM: dts: add cm36651 light/proximity sensor node for exynos4412-trats2") CC: stable@vger.kernel.org # 4.16+ Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com --- arch/arm/boot/dts/exynos4412-galaxy-s3.dtsi | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/boot/dts/exynos4412-galaxy-s3.dtsi b/arch/arm/boot/dts/exynos4412-galaxy-s3.dtsi index 44f97546dd0a..f910aa924bfb 100644 --- a/arch/arm/boot/dts/exynos4412-galaxy-s3.dtsi +++ b/arch/arm/boot/dts/exynos4412-galaxy-s3.dtsi @@ -68,7 +68,7 @@
i2c_cm36651: i2c-gpio-2 { compatible = "i2c-gpio"; - gpios = <&gpf0 0 GPIO_ACTIVE_LOW>, <&gpf0 1 GPIO_ACTIVE_LOW>; + gpios = <&gpf0 0 GPIO_ACTIVE_HIGH>, <&gpf0 1 GPIO_ACTIVE_HIGH>; i2c-gpio,delay-us = <2>; #address-cells = <1>; #size-cells = <0>;