linux-kernel - [PATCH 5.11 090/342] arm64: dts: imx8mq-librem5-r3: Mark buck3 as always on

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Date:   Mon, 10 May 2021 12:18:00 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>,
        Martin Kepplinger <martin.kepplinger@...i.sm>,
        Shawn Guo <shawnguo@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.11 090/342] arm64: dts: imx8mq-librem5-r3: Mark buck3 as always on

From: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.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@...i.sm>
Signed-off-by: Martin Kepplinger <martin.kepplinger@...i.sm>
Signed-off-by: Shawn Guo <shawnguo@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.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 6704ea2c72a3..cc29223ca188 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-librem5-r3.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5-r3.dts
@@ -22,6 +22,10 @@
 	ti,termination-current = <144000>;  /* uA */
 };
 
+&buck3_reg {
+	regulator-always-on;
+};
+
 &proximity {
 	proximity-near-level = <25>;
 };
-- 
2.30.2