linux-kernel - Re: [PATCH v2] misc: adds support the FSA9480 USB Switch

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Date:	Wed, 10 Nov 2010 14:31:10 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Minkyu Kang <promsoft@...il.com>
Cc:	Greg KH <greg@...ah.com>, Minkyu Kang <mk7.kang@...sung.com>,
	linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	kyungmin.park@...sung.com, Ben Dooks <ben-i2c@...ff.org>
Subject: Re: [PATCH v2] misc: adds support the FSA9480 USB Switch

On Wed, Nov 10, 2010 at 09:55:34AM +0900, Minkyu Kang wrote:
> Dear Greg KH,

> > And why are you exporting symbols from this driver, that should not be
> > needed at all.

> It's for other drivers.
> For example.. When USB cable is connected, PMIC driver enable the
> power for each device. (USB, uart, audio and so on..)
> But if use the manual switch, PMIC driver can't know what device is enabled.
> So, this function was exported.

This seems like it would require the PMIC driver to have knowledge of
the USB switch driver which would be likely to give a system which is
rather board specific.  For PMIC supply management integration the
regulator API would be more normal.
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