[alsa-devel] [PATCH 4/4] ASoC: TWL4030: Driver registration via twl4030_codec MFD

Mark Brown broonie at opensource.wolfsonmicro.com
Tue Oct 20 12:25:40 CEST 2009

On Mon, Oct 19, 2009 at 03:42:20PM +0300, Peter Ujfalusi wrote:
> TWL4030 codec is now using the device registration via
> tlw4030_codec MFD device.

This looks pretty good but obviously depends on the MFD changes.  The
major thing that jumps out at me is the removal of the register
definitions from the ASoC headers - it might be nice to have that done
as part of the MFD patch, or as a separate patch.

You've also got the bias being brought up when the ASoC system comes up
rather than when the driver comes up.  To be honest it doesn't really
make any difference either way, it's just slightly different to other
drivers.  What is useful with things like twl4030 which take a little
while to come up is if you can do the bias bringup out of line from
device probe, avoiding blocking system startup on CODEC bringup.  That's
definitely a separate patch, I'm just mentioning it for interest here.

There's also a couple of debug prints (like in the remove function) and

> +MODULE_ALIAS("platform:twl4030_codec:audio");

Is that second colon right given...

> +	.driver		= {
> +		.name	= "twl4030_codec_audio",
> +		.owner	= THIS_MODULE,


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