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

[Johan Hovold <jhovold@gmail.com>]

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@opensource.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