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

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Message-Id: <20091204133943.ddf0e53d.ospite@studenti.unina.it>
Date:	Fri, 4 Dec 2009 13:39:43 +0100
From:	Antonio Ospite <ospite@...denti.unina.it>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
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, 2 Dec 2009 18:06:58 +0000
Mark Brown <broonie@...nsource.wolfsonmicro.com> wrote:

> > +	vcc = regulator_get(&pdev->dev, pdata->supply);
> > +	if (IS_ERR(vcc)) {
> > +		dev_err(&pdev->dev, "Cannot get vcc for %s\n", pdata->name);
> > +		return PTR_ERR(vcc);;
> > +	}
> 
> You almost certainly want regulator_get_exclusive() here; this driver
> can't function properly if something else is using the regulator and
> holding the LED on or off without it.  You'll also want to check the
> status of the LED on startup and update your internal status to match
> that.

When you refer to "the status of the LED on startup" do you mean a
initial brightness value passed via leds-regulator platform data, or the
initial status or the regulator itself?

Thanks,
   Antonio

-- 
Antonio Ospite
http://ao2.it

PGP public key ID: 0x4553B001

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