linux-kernel - Re: Regulator suspend state dt question

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Message-ID: <20121206062836.GH10867@opensource.wolfsonmicro.com>
Date:	Thu, 6 Dec 2012 15:28:38 +0900
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Abhilash Kesavan <kesavan.abhilash@...il.com>
Cc:	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	grant.likely@...retlab.ca, lrg@...com,
	Doug Anderson <dianders@...omium.org>,
	Olof Johansson <olofj@...gle.com>,
	Thomas Abraham <thomas.abraham@...aro.org>
Subject: Re: Regulator suspend state dt question

On Thu, Dec 06, 2012 at 11:55:11AM +0530, Abhilash Kesavan wrote:

> As of now there is no support in the regulator core to specify the suspend state
> (mode, enabled/disabled) using dt. I can add new properties specifying
> the intial_state,
> mode, enable/disable but I am not too sure if it is appropriate to add
> such bindings to
> the device tree as they are not actually describing the hardware.

Well, it does depend on the hardware a bit - some hardware is hard wired
to only have one possible suspend state due to power up requirements.
But for a lot of hardware it's flexible...  

> Is calling regulator_suspend_prepare from a machine specific file an option ?

This is not really relevant, it's an orthogonal thing about when we
trigger the state transition in the regulator.

It's not clear what a good solution is here, sorry.
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