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

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

[Anson Huang]

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@nxp.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

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

[Fabio Estevam]

Hi Anson,

On Fri, Jun 22, 2018 at 3:28 AM, Anson Huang <Anson.Huang@nxp.com> wrote:
> 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

It would be nice to mention in the commit log what was the patch that
caused the breakage, just like Robin did for imx6sl-evk.

Thanks,

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

[Anson Huang]

Hi, Fabio

Anson Huang
Best Regards!


> -----Original Message-----
> From: Fabio Estevam [mailto:festevam@gmail.com]
> Sent: Monday, June 25, 2018 8:23 PM
> To: Anson Huang <anson.huang@nxp.com>
> Cc: Shawn Guo <shawnguo@kernel.org>; Sascha Hauer
> <s.hauer@pengutronix.de>; Sascha Hauer <kernel@pengutronix.de>; Fabio
> Estevam <fabio.estevam@nxp.com>; Rob Herring <robh+dt@kernel.org>;
> Mark Rutland <mark.rutland@arm.com>; open list:OPEN FIRMWARE AND
> FLATTENED DEVICE TREE BINDINGS <devicetree@vger.kernel.org>;
> dl-linux-imx <linux-imx@nxp.com>; moderated list:ARM/FREESCALE IMX / MXC
> ARM ARCHITECTURE <linux-arm-kernel@lists.infradead.org>; linux-kernel
> <linux-kernel@vger.kernel.org>
> Subject: Re: [PATCH] ARM: dts: imx6sll-evk: make pfuze100 sw4 always on
> 
> Hi Anson,
> 
> On Fri, Jun 22, 2018 at 3:28 AM, Anson Huang <Anson.Huang@nxp.com>
> wrote:
> > 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
> 
> It would be nice to mention in the commit log what was the patch that caused
> the breakage, just like Robin did for imx6sl-evk.
> 
> Thanks,
 
Done, already sent out V2 patch, please review it, thanks.

Anson.