Messages in this thread | | | Date | Fri, 3 Jul 2009 07:16:01 +0800 | From | Alek Du <> | Subject | Re: [PATCH] gpio: add Intel Moorestown Platform Langwell chip gpio driver |
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David,
On Fri, 3 Jul 2009 03:45:55 +0800 David Brownell <david-b@pacbell.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.
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