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

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Message-ID: <20120302125819.GE3230@opensource.wolfsonmicro.com>
Date:	Fri, 2 Mar 2012 12:58:20 +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 Fri, Mar 02, 2012 at 05:16:04PM +0900, Tomoya MORINAGA wrote:
> 2012年3月1日8:51 Mark Brown <broonie@...nsource.wolfsonmicro.com>:

> >> +static int ml26124_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
> >> +                               int div_id, int div)
> >> +{
> >> +     struct snd_soc_codec *codec = codec_dai->codec;

> >> +     switch (div_id) {
> >> +     case ML26124_MCLK:
> >> +             ml26124_update_bits(codec, ML26124_CLK_CTL,
> >> +                                   BIT(0) | BIT(1), div);
> >> +             break;

> > Why can't the driver calculate this automatically given the MCLK?

> Sorry, I can't understand your saying.
> Why does this driver need to calculate ?
> I think this driver can use "div" value directly.

Why does the user have to set this divider by hand at all?  There's
already a set_sysclk() function, just have the user specify the clock
they're providing.

> >> +     ret = snd_soc_codec_set_cache_io(codec, 8, 8, SND_SOC_I2C);

> > You're mixing regmap API usage and ASoC level I2C, this should be
> > _REGMAP.

> Currently, it seems codec control via i2c works well.
> Let me know why I should  use SND_SOC_REGMAP not _I2C.

Have you checked what _I2C and _REGMAP do?

> >> +static int __init ml26124_modinit(void)
> >> +{
> >> +     int ret;
> >> +
> >> +     ret = i2c_add_driver(&ml26124_i2c_driver);
> >> +     if (ret != 0)

> > module_i2c_driver().

> Sorry, I can't understand your saying.

Use module_i2c_driver().

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