linux-kernel - Re: [PATCH 1/3] cs5535-gpio: add AMD CS5535/CS5536 GPIO driver support

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Message-ID: <20090820124002.58d3d25b@mycelium.queued.net>
Date:	Thu, 20 Aug 2009 12:40:02 -0400
From:	Andres Salomon <dilinger@...labora.co.uk>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Takashi Iwai <tiwai@...e.de>, cjb@...top.org,
	deepak@...top.org, linux-geode@...ts.infradead.org,
	Jordan Crouse <jordan@...micpenguin.net>,
	Tobias_Mueller@...m.info
Subject: Re: [PATCH 1/3] cs5535-gpio: add AMD CS5535/CS5536 GPIO driver
 support

On Thu, 20 Aug 2009 17:21:20 +0200
Takashi Iwai <tiwai@...e.de> wrote:

> At Tue, 18 Aug 2009 17:53:14 -0400,
> Andres Salomon wrote:
> > 
> > 
> > This creates a CS5535/CS5536 GPIO driver which uses a gpio_chip
> > backend (allowing GPIO users to use the generic GPIO API if
> > desired) while also allowing architecture-specific users directly
> > (via the cs5535_gpio_* functions).
> 
> Will be any user of cs5535_gpio_*() expected?  If not, it'd be better
> not to export stuff, IMO.
> 

The olpc-dcon driver, for one.  If desired, I can remove the exports
for now.


> > Tested on an OLPC machine.  Some Leemotes also use CS5536 (with a
> > mips cpu), which is why this is in drivers/gpio rather than
> > arch/x86. Currently, it conflicts with older geode GPIO support;
> > once MFGPT support is reworked to also be more generic, the older
> > geode code will be removed.
> 
> .... or you can rewrite the old driver to use the functions above?
> Then the ugly Kconfig check can be dropped, too.  (yeah that's an
> answer to my own question above.)

I guess in theory I could.. 


> 
> BTW CONFIG_GPIO_CS5536 and CONFIG_CS5536_GPIO are so confusing... :)
> 

Agreed.  I'd really like CONFIG_CS5535_GPIO to go away, but first there
needs to be a replacement.  CONFIG_CS5535_GPIO will probably also need
to be marked DEPRECATED for a while, too, since it's a
userspace-visible change.  I can follow up w/ a patch for that once
people are happy w/ this current set of patches.

> > Signed-off-by: Andres Salomon <dilinger@...labora.co.uk>
> 
> I can happily merge this patch series to sound GIT tree if no one
> objects, since it's basically for OLPC sound stuff.
> 
> 
> thanks,
> 
> Takashi
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