Anson Huang Best Regards!
> -----Original Message----- > From: Fabio Estevam [mailto:[email protected]] > Sent: Monday, July 2, 2018 7:33 AM > To: Shawn Guo <[email protected]>; Anson Huang > <[email protected]> > Cc: Robin Gong <[email protected]>; Mark Rutland > <[email protected]>; open list:OPEN FIRMWARE AND FLATTENED > DEVICE TREE BINDINGS <[email protected]>; linux-kernel > <[email protected]>; Rob Herring <[email protected]>; > dl-linux-imx <[email protected]>; Sascha Hauer <[email protected]>; > Fabio Estevam <[email protected]>; moderated list:ARM/FREESCALE > IMX / MXC ARM ARCHITECTURE <[email protected]> > Subject: Re: [PATCH v1] ARM: dts: imx6sl-evk: keep sw4 always on > > On Sun, Jul 1, 2018 at 6:34 AM, Shawn Guo <[email protected]> wrote: > > On Mon, Jun 25, 2018 at 08:34:11PM +0800, Robin Gong wrote: > >> SW4 is one power rail for LPDDR2 on i.mx6sl-evk, so it should be kept > >> always on. But it's disabled after switch disabled interface > >> implemented in pfuze driver 'commit 5fe156f1cab4 > >> ("regulator: pfuze100: add enable/disable for switch")'.Thus, it > >> breaks kernel bootup. Add 'regulator-always-on' for SW4. > >> > >> Signed-off-by: Robin Gong <[email protected]> > > > > Does that mean boards with existing DTB installed will stop working > > with new kernel? That's bad, and the kernel commit should probably be > > reverted. > > Yes, this is a good point. > > Anson, > > Should 5fe156f1cab4 ("regulator: pfuze100: add enable/disable for > switch") be reverted to avoid such breakage? Yes, I think we can revert it to avoid breakage. Didn't notice that some i.MX platform do NOT have those critical switches always-on. Anson.
