linux-kernel - Re: [PATCH] regulator: twl: Enable regulators over the powerbus as well

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Date:	Fri, 25 Mar 2016 21:19:12 +0100
From:	Sebastian Reichel <sre@...nel.org>
To:	Mark Brown <broonie@...nel.org>
Cc:	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>, tony@...mide.com,
	lgirdwood@...il.com, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] regulator: twl: Enable regulators over the powerbus as
 well

Hi Mark,

On Fri, Mar 25, 2016 at 06:20:17PM +0000, Mark Brown wrote:
> On Fri, Mar 25, 2016 at 07:22:45PM +0200, Ivaylo Dimitrov wrote:
> 
> > On Nokia N900 regulators are left in the mode last set by the bootloader or
> > by the stock kernel, depends on whether it is power-on or reboot from stock
> > kernel to mainline. That leads to problem with devices connected to vmmc2
> > regulator - when the device is rebooted from stock kernel vmmc2 is left in
> > "sleep" mode (REGULATOR_STATUS_STANDBY in terms of regulator framework) and
> > as noone in mainline kernel switches vmmc2 regulator to normal
> > (REGULATOR_STATUS_NORMAL) mode, devices supplied by it does not get enough
> > power to operate normally.
> 
> Then there is a constraint that the regulators must be in normal mode
> and this needs to be expressed in the machine constraints.

As in adding "regulator-initial-mode = <TWL4030_OPMODE_NORMAL>;" to
the regulator's DT node (and providing an of_map_mode method in the
twl-regulator driver)?

-- Sebastian

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