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

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Date:	Thu, 15 Jan 2009 15:02:05 +0800
From:	Eric Miao <eric.y.miao@...il.com>
To:	Mike Rapoport <mike@...pulab.co.il>
Cc:	Jonathan Cameron <jic23@....ac.uk>,
	LKML <linux-kernel@...r.kernel.org>,
	Mark Brown <broonie@...ena.org.uk>,
	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.

On Thu, Jan 15, 2009 at 2:34 PM, Mike Rapoport <mike@...pulab.co.il> wrote:
>
>
> Eric Miao wrote:
>> On Thu, Jan 15, 2009 at 2:16 AM, Jonathan Cameron <jic23@....ac.uk> wrote:
>>> From: Jonathan Cameron <jic23@....ac.uk>
>>>
>>> Add support for changing the mode of the da9030 usb charge pump
>>>
>>
>> Well, if it is totally USB charger related, I'd suggest to move this into
>> the dedicated driver. This mfd/da903x.c serves as a common code
>> base for all sub-peripherals.
>
> It's not exactly related to the charger, it's rather related to the USB voltage
> supplied to USB devices attached to PXA OHCI.
> Indeed the mfd/da903x.c serves as a common core for sub-peripherals, but IMHO
> adding a subdevice driver because of single method doesn't worth the overhead.
> I'm for the solution Jonathan proposes.
>

Mmm... then who will be the invoker? I'm a bit upset about this
being exported while called out of control. If it works as the
name suggested, setting some mode, maybe we can have a
platform data field specifying this, and hide this totally within
the driver. I didn't look into this too much, just a concern here.
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