linux-kernel - Re: [PATCH 2/4] powerpc/qe: new call to revert a gpio to a dedicated function

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Message-ID: <20080924114231.GA8469@oksana.dev.rtsoft.ru>
Date:	Wed, 24 Sep 2008 15:42:31 +0400
From:	Anton Vorontsov <avorontsov@...mvista.com>
To:	Kumar Gala <galak@...nel.crashing.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Greg Kroah-Hartman <greg@...ah.com>,
	Timur Tabi <timur@...escale.com>,
	Li Yang <leoli@...escale.com>,
	Laurent Pinchart <laurentp@...-semaphore.com>,
	linuxppc-dev@...abs.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] powerpc/qe: new call to revert a gpio to a
	dedicated function

On Tue, Sep 23, 2008 at 11:07:00PM -0500, Kumar Gala wrote:
>
> On Sep 23, 2008, at 7:03 PM, Anton Vorontsov wrote:
>
>> qe_gpio_set_dedicated() is a platform specific function, which is used
>> to revert a pin to a dedicated function. Caller should have already
>> obtained the gpio via gpio_request().
>>
>> This is needed to support Freescale USB Host Controller.
>>
>> Signed-off-by: Anton Vorontsov <avorontsov@...mvista.com>
>> ---
>> arch/powerpc/include/asm/qe.h     |    1 +
>> arch/powerpc/sysdev/qe_lib/gpio.c |   46 ++++++++++++++++++++++++++++ 
>> +++++++++
>> 2 files changed, 47 insertions(+), 0 deletions(-)
>
> what do you mean by dedicated function.. be a bit clearer in the commit 
> log.

This term is from the QE spec, I didn't invent anything. ;-)

"Each pin in the I/O ports can be configured as a general-purpose
I/O signal or as a dedicated peripheral interface signal. ...many
dedicated peripheral functions are multiplexed onto the ports."

> Also, does this depend on gpio_to_chip() patch?

Yeah, the point of exported gpio_to_chip is to let us write
this function.

Thanks!

-- 
Anton Vorontsov
email: cbouatmailru@...il.com
irc://irc.freenode.net/bd2
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