linux-kernel - Re: [PATCH] leds: Add LED class driver for regulator driven LEDs.

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Message-ID: <20091202204026.GA18311@rakim.wolfsonmicro.main>
Date:	Wed, 2 Dec 2009 20:40:26 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Antonio Ospite <ospite@...denti.unina.it>
Cc:	Richard Purdie <rpurdie@...ys.net>,
	Liam Girdwood <lrg@...mlogic.co.uk>,
	Daniel Ribeiro <drwyrm@...il.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	openezx-devel@...ts.openezx.org
Subject: Re: [PATCH] leds: Add LED class driver for regulator driven LEDs.

On Wed, Dec 02, 2009 at 09:25:21PM +0100, Antonio Ospite wrote:
> Mark Brown <broonie@...nsource.wolfsonmicro.com> wrote:

> > There's no need to do this since the regulator API matches consumers
> > based on struct device as well as name so you can have as many LEDs as
> > you like all using the same supply name mapping to different regulators.

> I need some more explanation here, I am currently using the driver with
> this code:

> +/* VVIB: Vibrator on A780, A1200, A910, E6, E2 */
> +static struct regulator_consumer_supply pcap_regulator_VVIB_consumers
> [] = {
> +	{ .dev_name = "leds-regulator", .supply = "vibrator", },

So you're instantiating the device with .id set to -1 (as your code
below shows), meaning there's only one leds-regulator in the system and
there's no need to number them.  If you had more than one of them then
you'd number them and then have something like:

	{ .dev_name = "leds-regulator.0", supply = "vled" },
	{ .dev_name = "leds-regulator.1", supply = "vled" },

when setting up the supplies.

> If I set the .supply value fixed, how can I assign different
> regulators to different leds? Should I use the address to the platform
> device (a780_vibrator in this case) for .dev when defining the
> regulator in the first place?

There is no need to use the .dev field, that is kept to avoid build
breakage transitioning to dev_name.
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