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

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Date:	Tue, 29 Apr 2014 00:19:34 +0800
From:	Chen-Yu Tsai <wens@...e.org>
To:	linux-sunxi <linux-sunxi@...glegroups.com>
Cc:	Linus Walleij <linus.walleij@...aro.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>
Subject: Re: [linux-sunxi] Re: [PATCH 1/7] gpiolib: gpiolib-of: Implement
 device tree gpio-names based lookup

On Wed, Apr 23, 2014 at 9:49 AM, Alexandre Courbot <gnurou@...il.com> wrote:
> 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.

I will pull out the two patches.

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

I hope they will be compatible with ACPI named gpios, whenever support
for ACPI named properties extension lands. But that really depends on
the ACPI implementation. For now I think it's best that I just hold on
to these. We can revisit the discussion later if needed.

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


Thanks
ChenYu
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