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

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Message-ID: <4B8CDA64.4070504@compulab.co.il>
Date:	Tue, 02 Mar 2010 11:29:08 +0200
From:	Denis Turischev <denis@...pulab.co.il>
To:	Len Brown <lenb@...nel.org>
CC:	Mike Rapoport <mike@...pulab.co.il>,
	David Brownell <david-b@...bell.net>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/3] gpio: add Intel SCH GPIO controller driver

Mike Rapoport wrote:
> Len Brown 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.
>> FWIW
>> 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.
> 
> The cs5535 is AMD Geode LX companion chip which is used with ACPI BIOS 
> as well.
> 
>> cheers,
>> Len Brown, Intel Open Source Technology Center
>>
> 
> 

I'm really not an ACPI expert too, but as I see in LDD3 "...the role of a device driver
is providing mechanism, not policy".

HW manufacturer must warn users if some GPIOs may conflict with ACPI, and it is user`s
responsibility to use the GPIOs in proper way.

Denis
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