From: Sebastian Krzyszkowiak sebastian.krzyszkowiak@puri.sm
[ Upstream commit a362b0cc94d476b097ba0ff466958c1d4e27e219 ]
Commit 99e71c029213 ("arm64: dts: imx8mq-librem5: Don't mark buck3 as always on") removed always-on marking from GPU regulator, which is great for power saving - however it introduces additional i2c0 traffic which can be deadly for devices from the Dogwood batch.
To workaround the i2c0 shutdown issue on Dogwood, this commit marks buck3 as always-on again - but only for Dogwood (r3).
Signed-off-by: Sebastian Krzyszkowiak sebastian.krzyszkowiak@puri.sm Signed-off-by: Martin Kepplinger martin.kepplinger@puri.sm Signed-off-by: Shawn Guo shawnguo@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm64/boot/dts/freescale/imx8mq-librem5-r3.dts | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5-r3.dts b/arch/arm64/boot/dts/freescale/imx8mq-librem5-r3.dts index 0d38327043f8..cd3c3edd48fa 100644 --- a/arch/arm64/boot/dts/freescale/imx8mq-librem5-r3.dts +++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5-r3.dts @@ -28,6 +28,10 @@ ti,termination-current = <144000>; /* uA */ };
+&buck3_reg { + regulator-always-on; +}; + &proximity { proximity-near-level = <25>; };