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From: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
To: Alexandre Courbot <gnurou-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
	<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
	Linus Walleij
	<linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	"devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Heikki Krogerus
	<heikki.krogerus-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>,
	netdev <netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"linux-wireless"
	<linux-wireless-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"linux-sunxi"
	<linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>,
	"linux-kernel"
	<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Maxime Ripard
	<maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>,
	"Chen-Yu Tsai" <wens-jdAy2FN1RRM@public.gmane.org>,
	Johannes Berg <johannes-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>,
	Mika Westerberg
	<mika.westerberg-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>,
	"David S. Miller" <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>,
	"linux-gpio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-gpio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH RFC 4/6] net: rfkill: gpio: add device tree support
Date: Tue, 21 Jan 2014 19:50:06 +0100	[thread overview]
Message-ID: <201401211950.07011.arnd@arndb.de> (raw)
In-Reply-To: <CAAVeFuKFfAvSPYLmvWV5jjT-peZFJ8sJ2bbh4F=JAYoWLhjZpA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

On Tuesday 21 January 2014, Alexandre Courbot wrote:
> >> As discussed earlier in this thread I'm not sure the con_id is
> >> suitable for labelling GPIOs. It'd be better to have a proper name
> >> specified in DT/ACPI instead.
> >
> > +1
> 
> I wonder why you guys prefer to have the name defined in the GPIO
> mapping. Having the driver decide the label makes it easier to look up
> which GPIO does what in debugfs, whereas nothing prevents people to
> name GPIOs whatever inadequate name they want in the device DT node.
> What am I overlooking here?

I should have another look at the debugfs representation, but isn't
there a global namespace that gets used for all gpios?  Neither the
con_id nor the name that the driver picks would be globally unique
and stable across kernel versions, so they don't make a good user
interface.

I think what we want here is a system-wide unique identifier for
each gpio line that may get represented in debugfs, and use a new
DT mechanism to communicate that.

	Arnd

  parent reply	other threads:[~2014-01-21 18:50 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-01-17  6:47 [PATCH RFC 0/6] net: rfkill: gpio: Add device tree support Chen-Yu Tsai
     [not found] ` <1389941251-32692-1-git-send-email-wens-jdAy2FN1RRM@public.gmane.org>
2014-01-17  6:47   ` [PATCH RFC 1/6] net: rfkill: gpio: fix gpio name buffer size off by 1 Chen-Yu Tsai
2014-01-17  9:46     ` David Laight
     [not found]       ` <063D6719AE5E284EB5DD2968C1650D6D45EA9D-VkEWCZq2GCInGFn1LkZF6NBPR1lH4CV8@public.gmane.org>
2014-01-17  9:59         ` Chen-Yu Tsai
2014-01-17  6:47   ` [PATCH RFC 2/6] net: rfkill: gpio: use clk_prepare_enable/clk_disable_unprepare Chen-Yu Tsai
2014-01-17  6:47   ` [PATCH RFC 3/6] net: rfkill: gpio: fix reversed clock enable state Chen-Yu Tsai
2014-01-17  6:47   ` [PATCH RFC 4/6] net: rfkill: gpio: add device tree support Chen-Yu Tsai
     [not found]     ` <1389941251-32692-5-git-send-email-wens-jdAy2FN1RRM@public.gmane.org>
2014-01-17 16:47       ` Arnd Bergmann
     [not found]         ` <201401171747.46332.arnd-r2nGTMty4D4@public.gmane.org>
2014-01-17 17:43           ` Chen-Yu Tsai
     [not found]             ` <CAGb2v67UKiyfJbKZ_Frk3OwZupMPoA2Ck3Hj2zsRFXBQPztavg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-17 20:13               ` Arnd Bergmann
2014-01-17 23:11               ` Linus Walleij
     [not found]                 ` <CACRpkdZOD4zeA8T5kbJ4c5NsnuzHCg1mw8rRMYNT9c4R-Qnc6A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-18  4:41                   ` Chen-Yu Tsai
2014-01-20  8:10                   ` Heikki Krogerus
2014-01-21  3:11                 ` Alexandre Courbot
     [not found]                   ` <CAAVeFuLP4MkfXGG1FMauvUw_J63zRXdhGwxqYy5W98L1wCQNbw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-21  9:35                     ` Linus Walleij
     [not found]                       ` <CACRpkdYiy+sya6NqRfAmsrFOXvaa3qX=qjRuTDW1vZVSaG1+Gg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-21 12:35                         ` Arnd Bergmann
     [not found]                           ` <201401211335.16885.arnd-r2nGTMty4D4@public.gmane.org>
2014-01-21 14:53                             ` Alexandre Courbot
2014-01-21 15:25                               ` Mika Westerberg
     [not found]                               ` <CAAVeFuKFfAvSPYLmvWV5jjT-peZFJ8sJ2bbh4F=JAYoWLhjZpA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-21 18:50                                 ` Arnd Bergmann [this message]
2014-01-22 12:38                                   ` Mark Brown
2014-01-22  9:54                                 ` Linus Walleij
2014-01-22  9:58                                 ` Linus Walleij
     [not found]                                   ` <CACRpkdZbb=eO8YRtMn6hW0vn97PkHUo88e_o61DEC8=wPY3_PQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-22 11:00                                     ` Mika Westerberg
2014-01-27 14:24       ` Maxime Ripard
2014-01-29  4:01         ` Chen-Yu Tsai
2014-01-17  6:47   ` [PATCH RFC 5/6] net: rfkill: gpio: add clock-frequency device tree property Chen-Yu Tsai
2014-01-17  6:47   ` [PATCH RFC 6/6] ARM: sun7i: cubietruck: enable bluetooth module Chen-Yu Tsai
2014-01-17 20:26 ` [PATCH RFC 0/6] net: rfkill: gpio: Add device tree support Johannes Berg

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