linux-kernel - Re: [PATCH v6] sound/soc/codecs: add LAPIS Semiconductor ML26124

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Message-ID: <20120306100012.GC19635@opensource.wolfsonmicro.com>
Date:	Tue, 6 Mar 2012 10:00:12 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Tomoya MORINAGA <tomoya.rohm@...il.com>
Cc:	Liam Girdwood <lrg@...com>, Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.de>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org, qi.wang@...el.com,
	yong.y.wang@...el.com, joel.clark@...el.com, kok.howg.ewe@...el.com
Subject: Re: [PATCH v6] sound/soc/codecs: add LAPIS Semiconductor ML26124

On Tue, Mar 06, 2012 at 12:03:20PM +0900, Tomoya MORINAGA wrote:
> 2012年3月2日21:58 Mark Brown <broonie@...nsource.wolfsonmicro.com>:

> >> Let me know why I should  use SND_SOC_REGMAP not _I2C.

> > Have you checked what _I2C and _REGMAP do?

> I've just checked it.
> If SND_SOC_REGMAP is used, it seems there is no processing in it.

This is not the case.

> So, can I delete snd_soc_codec_set_cache_io ?

No.

> > Use module_i2c_driver().

> I understand.

> As a matter of interest, why can I use module_i2c_driver ?

It is best practice.

> There is no ASoC driver uses module_i2c_driver.

This is not the case.  As I have *REPEATEDLY* told you you should be
sumbitting code against current development versions of the subsystem.

> >> +static int ml26124_update_bits(struct snd_soc_codec *codec, unsigned short reg,
> >> +                             unsigned int mask, unsigned int value)

> > Why are you open coding this in your driver?  There is no point in
> > replicating subsystem functionality.

> For ML26124 spec, it's necessary.
> Because the codec's register read-address and write-address is not the same.
> E.G.
> Sampling Rate Register
> R: offset=0
> W: offset=1

This is not what the above prototype says, the above prototype has only
one register in it.  You need to make this *much* clearer for the
registers it's affecting.

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