linux-kernel - Re: [PATCH RFC 4/6] net: rfkill: gpio: add device tree support

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Message-ID: <20140122123819.GH17314@sirena.org.uk>
Date:	Wed, 22 Jan 2014 12:38:19 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Alexandre Courbot <gnurou@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	netdev <netdev@...r.kernel.org>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	linux-sunxi <linux-sunxi@...glegroups.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Chen-Yu Tsai <wens@...e.org>,
	Johannes Berg <johannes@...solutions.net>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	"David S. Miller" <davem@...emloft.net>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH RFC 4/6] net: rfkill: gpio: add device tree support

On Tue, Jan 21, 2014 at 07:50:06PM +0100, Arnd Bergmann wrote:

> 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.

Currently the globally unique name is the GPIO number but that's not
stable since it gets dynamically assigned.  

> 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.

We've mostly been using things based off dev_name() for stability.

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