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Date: Tue, 19 Apr 2011 22:16:53 +0100
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Anton Vorontsov <cbouatmailru@gmail.com>
Cc: Grant Likely <grant.likely@secretlab.ca>,
        Jean Delvare <khali@linux-fr.org>, LKML <linux-kernel@vger.kernel.org>,
        Jamie Iles <jamie@jamieiles.com>,
        Mark Brown <broonie@opensource.wolfsonmicro.com>, arnd@arndb.de
Subject: Re: [PATCH] gpio: New driver for the Intel 82801 (ICH) GPIO pins
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On Wed, 20 Apr 2011 00:30:31 +0400
Anton Vorontsov <cbouatmailru@gmail.com> wrote:

> On Tue, Apr 19, 2011 at 06:08:29PM +0100, Alan Cox wrote:
> > > How about exporting some bus/device-type neutral probe function, like
> > > we do in drivers/ata/pata_platform.c ?
> > 
> > Not sure you want to be using resources as the basic currency, nor do you
> > want your generic code doing the request_region stuff. That was a nasty
> > mistake we made in the IDE code.
> > 
> > Maybe the platform code should do that bit, but the generic stuff not - in
> > the PCI case the caller will have done pci_request_* itself and chances
> > are several of the resources are the same pci device resource and
> > different offsets so doing request_resource on them will blow up.
> 
> Oh, right. How about this:
> 
> int __devinit bgpio_probe(struct device *dev,
>                           unsigned long sz,
>                           void __iomem *dat,
>                           void __iomem *set,
>                           void __iomem *clr,
>                           void __iomem *dirout,
>                           void __iomem *dirin,
>                           bool big_endian);
> 
> I.e. PCI driver can now map the whole area with a single ioremap(),
> and then call bgpio_probe(), which will provide accessors and
> common MMIO GPIO registration stuff.

Looks sane and providing its all using iomap/ioread/iowrite it covers all
cases nicely.