linux-kernel - Re: [PATCH 1/7] gpiolib: gpiolib-of: Implement device tree gpio-names based lookup

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Date:	Wed, 23 Apr 2014 10:49:12 +0900
From:	Alexandre Courbot <gnurou@...il.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Chen-Yu Tsai <wens@...e.org>,
	Johannes Berg <johannes@...solutions.net>,
	"John W. Linville" <linville@...driver.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Arnd Bergmann <arnd@...db.de>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Stephen Warren <swarren@...dotorg.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH 1/7] gpiolib: gpiolib-of: Implement device tree gpio-names
 based lookup

On Wed, Apr 23, 2014 at 12:02 AM, Linus Walleij
<linus.walleij@...aro.org> wrote:
> On Tue, Apr 15, 2014 at 8:41 AM, Chen-Yu Tsai <wens@...e.org> wrote:
>
>> This patch provides of_get_gpiod_flags_by_name(), which looks up GPIO
>> phandles by name only, through gpios/gpio-names, and not by index.
>>
>> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
>
> Like Alexandre I have no strong opinion on this alternative scheme.

Yeah this new lookup scheme probably does no harm, but I think it
should be a little bit more motivated as it is, after all, introducing
more potential confusion for DT users.

It does not look like this new lookup scheme is necessary to Chen-Yu's
patchset and that he could as well have used the current one. Right
now there is only one way to define GPIOs - if we introduce a second
one, then which one should new DT users choose? Which one looks
better? I can already endless fights taking place over this.

Does this new lookup help with some of the existing problems we have
like ACPI/DT lookup compatibility?

I just need to be given one practical reason to give my ack.

Alex.
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