linux-kernel - Re: [PATCH 2.6.29-rc1-git4] mfd: da9030 usb charge pump support within mfd driver.

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Message-ID: <496F3ABF.1020201@cam.ac.uk>
Date:	Thu, 15 Jan 2009 13:31:43 +0000
From:	Jonathan Cameron <jic23@....ac.uk>
To:	Mark Brown <broonie@...ena.org.uk>
CC:	Jonathan Cameron <Jonathan.Cameron@...il.com>,
	Eric Miao <eric.y.miao@...il.com>,
	Mike Rapoport <mike@...pulab.co.il>,
	LKML <linux-kernel@...r.kernel.org>,
	Samuel Ortiz <sameo@...nedhand.com>, felipe.balbi@...ia.com,
	Liam Girdwood <lrg@...nel.org>
Subject: Re: [PATCH 2.6.29-rc1-git4] mfd: da9030 usb charge pump support within
 mfd driver.

Mark Brown wrote:
> ")
> Fcc: +sent-mail
> 
> On Thu, Jan 15, 2009 at 11:22:34AM +0000, Jonathan Cameron wrote:
> 
>>> I would expect the final solution to be clean enough, that requires some
>>> dependent stuffs to be modified, and the final look of this patch may be a
>>> bit different
> 
>> Agreed.  This definitely isn't the way to go in the long run (assuming
>> otg etc get cleaned up)
>> but would it be an acceptable stop gap?  I'm just keen to get the
>> functionality available
>> so as to get a board config (intel stargate 2) sorted.  (some of which
>> you were kind enough to
>> review a while back - thanks).
> 
> Having looked at this problem just this week for some other designs I'm
> thinking the regulator API might be a good fit for this.  It is a supply
> and the API provides a method to match up the supply with the USB
> controller (some designs have multiple options there so that's useful).
> I've not actually tried it yet to see what the pain is like, though.
I did at one point.  The problem here is you aren't simply controlling the
current / voltage. You are switching it between various automatic modes
and a manual override.  Only in the manually overridden states is it
much like a regulator and then it's one with very odd properties.

If these are consistent enough across different pmic's I guess it could
be blugeoned in, but I'm not convinced this is true.

Jonathan



 

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