linux-kernel - Re: [PATCH] Export GPIO control symbols from mfp-pxa2xx.c

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Date:	Mon, 11 May 2009 22:39:28 +0800
From:	Eric Miao <eric.y.miao@...il.com>
To:	Michael Abbott <michael@...neidae.co.uk>
Cc:	Christoph Hellwig <hch@...radead.org>,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Export GPIO control symbols from mfp-pxa2xx.c

On Mon, May 11, 2009 at 3:28 PM, Michael Abbott <michael@...neidae.co.uk> wrote:
> On Mon, 11 May 2009, Christoph Hellwig wrote:
>> On Mon, May 11, 2009 at 07:43:29AM +0100, Michael Abbott wrote:
>> > With very lightweight board support providing a number of uncommitted GPIO
>> > pins I found that my out of kernel driver needs to call symbols that
>> > aren't actually exported.  This patch adds these exports.
>> As usual we don't export symbols for out of tree drivers.
>
> I understand that's the default condition, but presumably there's no
> compelling reason for the mfp configuration functions to be withheld (I
> was simply trying to obey the obsolescence instructions in pxa2xx-gpio.h!)
>
> As for bringing this driver in tree?  Not a great deal of point, in this
> particular case, but I have no problem with doing that.
>

I don't see many real requirements here to export them for the moment.
By keeping these functions/symbols not-exported, I'd expect board-specific
code (usually manipulation of these pins are board-specific) to be kept
in the "board.c" as well, which I do think is a good practice.

Since your driver is out of the tree, you can certainly keep this change
out of the tree as well :-)
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