linux-kernel - Re: [RFC PATCH 0/3] New Atmel PIO4 pinctrl/gpio driver

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Date:	Mon, 10 Aug 2015 08:53:34 +0200
From:	Ludovic Desroches <ludovic.desroches@...el.com>
To:	Sascha Hauer <s.hauer@...gutronix.de>
CC:	Ludovic Desroches <ludovic.desroches@...el.com>,
	<linux-gpio@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linus.walleij@...aro.org>,
	<nicolas.ferre@...el.com>
Subject: Re: [RFC PATCH 0/3] New Atmel PIO4 pinctrl/gpio driver

Hi Sascha,

On Wed, Aug 05, 2015 at 09:31:17AM +0200, Sascha Hauer wrote:
> On Fri, Jul 31, 2015 at 05:08:07PM +0200, Ludovic Desroches wrote:
> > Hi,
> > 
> > Following our discussion, I send an RFC version of my driver. RFC because it is
> > not totally achieved, some cleanup and feature addition is needed.
> > 
> > At least, we could discuss about the 'core' part. I have used the pinmux
> > property as Mediatek driver. Patch 3 is the internal dt files we are using.
> 
> As you can imagine I am fine with the binding, so I can add my acked-by
> once you send a non-RFC version.
>

Great, I'm glad to hear that.
 
> The only thing I never understood is what's so special about GPIOs that
> they have to bypass the pinctrl framework and instead a gpio_request
> magically translates a gpio into a pin.

Not sure to really understand your concern here... Do you mean I could
get rid of gpio_request_enable()?

> Wouldn't it make sense to at
> least add the pins in their GPIO mode to
> arch/arm/boot/dts/sama5d2-pinfunc.h?

It is done, PIN_PA0 could be used for this purpose.

Regards

Ludovic
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