linux-kernel - [PATCH V3] ARM: dts: imx6sll-evk: make pfuze100 sw4 always on

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Date:   Wed, 27 Jun 2018 09:25:25 +0800
From:   Anson Huang <Anson.Huang@....com>
To:     shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        fabio.estevam@....com, robh+dt@...nel.org, mark.rutland@....com
Cc:     Linux-imx@....com, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH V3] ARM: dts: imx6sll-evk: make pfuze100 sw4 always on

On i.MX6SLL EVK board, PFuze100's SW4 is supplying
LPDDR3, it needs to be always on. This patch fixes
Linux kernel boot up hang caused by commit 5fe156f1cab4
("regulator: pfuze100: add enable/disable for switch"),
because SW4 is turned off unexpectedly:

[    1.693613] cfg80211: failed to load regulatory.db
[    1.700063] SW4: disabling
[    1.703973] SWBST: disabling

Fixes: 5fe156f1cab4 ("regulator: pfuze100: add enable/disable for switch")
Signed-off-by: Anson Huang <Anson.Huang@....com>
Reviewed-by: Fabio Estevam <fabio.estevam@....com>
---
changes since V2:
	improve the way of referencing commit, and add fix tag.
 arch/arm/boot/dts/imx6sll-evk.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/imx6sll-evk.dts b/arch/arm/boot/dts/imx6sll-evk.dts
index 4684ac4..2217c40 100644
--- a/arch/arm/boot/dts/imx6sll-evk.dts
+++ b/arch/arm/boot/dts/imx6sll-evk.dts
@@ -142,6 +142,7 @@
 			sw4_reg: sw4 {
 				regulator-min-microvolt = <800000>;
 				regulator-max-microvolt = <3300000>;
+				regulator-always-on;
 			};
 
 			swbst_reg: swbst {
-- 
2.7.4