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SubjectRE: [PATCH V3] ARM: dts: imx6sll-evk: make pfuze100 sw4 always on
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Hi, Shawn

Anson Huang
Best Regards!


> -----Original Message-----
> From: Shawn Guo [mailto:shawnguo@kernel.org]
> Sent: Sunday, July 1, 2018 9:33 PM
> To: Anson Huang <anson.huang@nxp.com>
> Cc: s.hauer@pengutronix.de; kernel@pengutronix.de; Fabio Estevam
> <fabio.estevam@nxp.com>; robh+dt@kernel.org; mark.rutland@arm.com;
> devicetree@vger.kernel.org; dl-linux-imx <linux-imx@nxp.com>;
> linux-arm-kernel@lists.infradead.org; linux-kernel@vger.kernel.org
> Subject: Re: [PATCH V3] ARM: dts: imx6sll-evk: make pfuze100 sw4 always on
>
> On Wed, Jun 27, 2018 at 09:25:25AM +0800, Anson Huang 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
> > 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@nxp.com>
> > Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
>
> Just want to understand if we agree to break the existing DTB with v4.18
> kernel?
>
> Shawn

The kernel patch will break with existing DTB on some i.MX platforms, how
to handle this case, just revert the kernel regulator patch?

Anson.

>
> > ---
> > 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
> >
> >
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel@lists.infradead.org
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> >
> s.infradead.org%2Fmailman%2Flistinfo%2Flinux-arm-kernel&data=02%7C01%7
> >
> CAnson.Huang%40nxp.com%7C614a104918884539521a08d5df572851%7C686
> ea1d3bc
> >
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