linux-kernel - Re: [PATCH] net: rfkill: gpio: Add default GPIO driver mappings for ACPI

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Date:	Mon, 27 Oct 2014 11:21:58 -0400
From:	"John W. Linville" <linville@...driver.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Alexandre Courbot <gnurou@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Grant Likely <grant.likely@...aro.org>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: rfkill: gpio: Add default GPIO driver mappings for
 ACPI

On Mon, Oct 27, 2014 at 12:23:55PM +0100, Johannes Berg wrote:
> On Mon, 2014-10-27 at 12:15 +0200, Mika Westerberg wrote:
> > The driver uses devm_gpiod_get_index(..., index) so that the index refers
> > directly to the GpioIo resource under the ACPI device. The problem with
> > this is that if the ordering changes we get wrong GPIOs.
> > 
> > With ACPI 5.1 _DSD we can now use names instead to reference GPIOs
> > analogous to Device Tree. However, we still have systems out there that do
> > not provide _DSD at all. These systems must be supported as well.
> > 
> > Luckily we now have acpi_dev_add_driver_gpios() that can be used to provide
> > mappings for systems where _DSD is not provided and still take advantage of
> > _DSD if it exists.
> > 
> > This patch changes the driver to create default GPIO mappings if we are
> > running on ACPI system.
> > 
> > While there we can drop the indices completely and use devm_gpiod_get()
> > with name instead.
> > 
> > Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> > ---
> > Hi,
> > 
> > This patch is based on top of linux-pm/device-properties [1] and following
> > patch from Rafael [2].
> > 
> > Johannes, John,
> > 
> > If you are happy with the patch, can you ACK it so that we can merge it
> > with the rest of the device-properties patches. Thanks.
> 
> Acked-by: Johannes Berg <johannes@...solutions.net>
> Reviewed-by: Johannes Berg <johannes@...solutions.net>

Acked-by: John W. Linville <linville@...driver.com>

-- 
John W. Linville		Someday the world will need a hero, and you
linville@...driver.com			might be all we have.  Be ready.
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