Hi, Shawn Anson Huang Best Regards! > -----Original Message----- > From: Shawn Guo [mailto:shawnguo@xxxxxxxxxx] > Sent: Sunday, July 1, 2018 9:33 PM > To: Anson Huang <anson.huang@xxxxxxx> > Cc: s.hauer@xxxxxxxxxxxxxx; kernel@xxxxxxxxxxxxxx; Fabio Estevam > <fabio.estevam@xxxxxxx>; robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx; > devicetree@xxxxxxxxxxxxxxx; dl-linux-imx <linux-imx@xxxxxxx>; > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx > 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@xxxxxxx> > > Reviewed-by: Fabio Estevam <fabio.estevam@xxxxxxx> > > 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@xxxxxxxxxxxxxxxxxxx > > https://emea01.safelinks.protection.outlook.com/?url=http%3A%2F%2Flist > > > s.infradead.org%2Fmailman%2Flistinfo%2Flinux-arm-kernel&data=02%7C01%7 > > > CAnson.Huang%40nxp.com%7C614a104918884539521a08d5df572851%7C686 > ea1d3bc > > > 2b4c6fa92cd99c5c301635%7C0%7C0%7C636660487794141749&sdata=1%2B > EKM%2Bnx > > egyDGLc%2FHt9cbh%2BARlMSsoJP%2FbD6HlxwVFs%3D&reserved=0 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
