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

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Message-Id: <1529648932-4832-1-git-send-email-Anson.Huang@nxp.com>
Date:   Fri, 22 Jun 2018 14:28:52 +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] 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 SW4 being turned
off:

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

Signed-off-by: Anson Huang <Anson.Huang@....com>
---
 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