linux-kernel - Re: [PATCH] gpio: add Intel Moorestown Platform Langwell chip gpio driver

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Date:	Fri, 3 Jul 2009 07:16:01 +0800
From:	Alek Du <alek.du@...el.com>
To:	David Brownell <david-b@...bell.net>
CC:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: add Intel Moorestown Platform Langwell chip gpio
 driver

David,

On Fri, 3 Jul 2009 03:45:55 +0800
David Brownell <david-b@...bell.net> wrote:

> On Wednesday 01 July 2009, Du, Alek wrote:
> > > Is this a dedicated GPIO-only device?  Or is it like e.g. ICH8
> > > which shares that device with other functions?
> > 
> > Yes, the GPIO block is just one function of Langwell chip, the
> > Langwell chip is an IOH (IO hub) for the whole system. But the
> > devices on the chip are all exposed as PCI devices.  
> 
> To be clear:  this PCI function is *only* for GPIO?
> 
> Which is unlike the southbridge chips which have an LPC
> function, which exposes GPIOs along with other stuff.
> (So that LPC function should, arguably, be modeled as an
> MFD parent device; or an adapter to an LPC bus.)
> 

Yes, this PCI function is *only* for GPIO. Each devices on the IOH are
exposed as dedicated PCI functions. It is not a MFD style device.

Thanks,
Alek
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