Re: [PATCH v3 3/3] gpio: add Intel SCH GPIO controller driver

From: Alan Cox
Date: Mon Mar 01 2010 - 14:47:54 EST

On Mon, 01 Mar 2010 13:09:22 -0500 (EST)
Len Brown <lenb@xxxxxxxxxx> wrote:

> > I've looked at two x86 drivers in drivers/gpiolib (cs5535 and langwell) and
> > there's no treatment of ACPI in either of them. Since SCH is defined by Intel
> > as "embedded" product, having a GPIO driver for it seems logical even despite
> > problems you mention.
> I believe that Langwell is used only in products without an ACPI BIOS.
> Poulsbo, OTOH, is used in zillions of netbooks running Windows XP.
> I don't know what a cs5535 is.

Cyrix (then NatSemi then AMD) Geode companion chip. May be present
without having ACPI although ACPI was added as a BIOS upgrade to the older

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