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

[Jonathan Cameron <jic23@cam.ac.uk>]

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