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Message-ID: <20160325182017.GE5028@sirena.org.uk>
Date: Fri, 25 Mar 2016 18:20:17 +0000
From: Mark Brown <broonie@...nel.org>
To: Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
Cc: Sebastian Reichel <sre@...nel.org>, 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
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.
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