linux-kernel - Re: [PATCH v2 1/4] mfd: add LM3533 lighting-power core driver

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Message-ID: <20120503112803.GA15752@localhost>
Date:	Thu, 3 May 2012 13:28:03 +0200
From:	Johan Hovold <jhovold@...il.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Rob Landley <rob@...dley.net>, Richard Purdie <rpurdie@...ys.net>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Jonathan Cameron <jic23@....ac.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Florian Tobias Schandinat <FlorianSchandinat@....de>,
	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
	linux-fbdev@...r.kernel.org
Subject: Re: [PATCH v2 1/4] mfd: add LM3533 lighting-power core driver

On Thu, May 03, 2012 at 11:38:48AM +0100, Mark Brown wrote:
> On Thu, May 03, 2012 at 12:26:36PM +0200, Johan Hovold wrote:
> > Add support for National Semiconductor / TI LM3533 lighting power chips.
> > 
> > This is the core driver which provides register access over I2C and
> > registers the ambient-light-sensor, LED and backlight sub-drivers.
> 
> Reviwed-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
> 
> though
> 
> > +	dev_dbg(lm3533->dev, "read [%02x]: %02x\n", reg, *val);
> 
> I'd expect you can drop these log messages, if there's stuff like this
> missing we should add it to regmap.  At the minute the regmap logging is
> via trace points rather than debug logs as you can leave them enabled
> all the time.

If such debugging is added to regmap we still need a way to enable them
per driver (or rather regmap) to not clutter the logs.

These three dev_dbg statements are extremely useful during debugging /
development especially in combination with the other dynamic printks in
these drivers.

I'd actually prefer just keeping them for now.

> Might also be worth moving some of the sysfs stuff to live with the
> relevant drivers.

Which attributes do you have in mind?

The boost_freq and boost_ovp affect both backlight devices (i.e. cannot
be set separately) and as such belong in the parent driver IMO.

Same with the output_hvled{1..2}, output_lvled{1..5} attributes. The
chip has four logical LEDs ("control banks") but five low-voltage output
sinks. The five output_lvled attributes determine the mapping and as
such belong in the parent driver. The two logical backlight devices can
likewise be used to control either or both high-voltage outputs and
belong in the parent driver for the same reasons.

Thanks,
Johan
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