linux-kernel - Re: [RFC 0/5] New descriptor-based GPIO interface

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Message-ID: <20130923102134.GB28875@intel.com>
Date:	Mon, 23 Sep 2013 13:21:35 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Alexandre Courbot <acourbot@...dia.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Arnd Bergmann <arnd@...db.de>,
	Grant Likely <grant.likely@...aro.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Alexandre Courbot <gnurou@...il.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [RFC 0/5] New descriptor-based GPIO interface

On Fri, Sep 20, 2013 at 08:06:00PM +0200, Linus Walleij wrote:
> On Wed, Sep 4, 2013 at 1:29 PM, Alexandre Courbot <acourbot@...dia.com> wrote:
> 
> > Here is a first RFC for the new GPIO interface.
> 
> I'm quite happy with this, and given that all DT-implementations will start
> to use it from day 1 I'll happily merge it when you think it's tested enough.
> 
> On my wishlist is to also switch over the ACPI GPIO driver:
> drivers/gpio/gpiolib-acpi.c to use the descriptors directly, so
> I'd like one of the ACPI folks to have a look at this patch set
> and see how it looks from their angle.
> 
> Mika, Rafael, Mathias, and either of you guys have a look
> at this?

Apart from the con_id thing I commented, I don't see huge problems
converting the ACPI GPIO helpers to this new interface.

One thing that is special to ACPI is that we have two kind of GPIO
"connections":

	GpioIo - a normal GPIO that the driver can toggle or read values

	GpioInt - this is specifically used as a GPIO interrupt

The drivers should be able to distinguish between the two. Currently we
have an extra parameter in acpi_get_gpio_by_index(..., &info) that can be
used for this. However, with the new gpiod_get() I'm not sure how we are
supposed to do this now?

Anyway, that shouldn't prevent merging this patch set. I'm sure that we can
come up with some working solution :-)
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