linux-kernel - Re: [PATCH v6] sun4i-codec: Add FM, Line and Mic inputs

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Date:	Tue, 15 Dec 2015 02:52:08 +0100
From:	Danny Milosavljevic <dannym@...atchpost.org>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	linux-sunxi@...glegroups.com, Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>, Chen-Yu Tsai <wens@...e.org>,
	alsa-devel@...a-project.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6] sun4i-codec: Add FM, Line and Mic inputs

Hi Maxime,

On Sun, 13 Dec 2015 21:58:39 +0100
Maxime Ripard <maxime.ripard@...e-electrons.com> wrote:

> This is not the branch you should be basing your patch on. This is an
> ASoC patch, base it on the ASoC tree.

Okay, will do. To the branch "sunxi-next" in 
<git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git>, right?

[...]
> > -static const struct regmap_config sun4i_codec_regmap_config = {
> > -	.reg_bits	= 32,
> > -	.reg_stride	= 4,
> > -	.val_bits	= 32,
> > -	.max_register	= SUN4I_CODEC_AC_MIC_PHONE_CAL,
> > -};
> > -
> 
> Why is this moved?

Because SUN4I_CODEC_AC_MIC_PHONE_CAL is sun7i-specific. 
Note: I also renamed it and moved the #define in the course of grouping 
together sun7i-specific things:

> +/* sun7i-specific things: */
> +/* MIC_PHONE_CAL register offsets and bit fields (A20 only) */
> +#define SUN7I_CODEC_AC_MIC_PHONE_CAL		(0x3c)
[...]
> +static const struct regmap_config sun4i_codec_regmap_config = {
> +	.reg_bits	= 32,
> +	.reg_stride	= 4,
> +	.val_bits	= 32,
> +	.max_register	= SUN7I_CODEC_AC_MIC_PHONE_CAL,
> +};
> +/* end sun7i-specific things */

I thought about also renaming sun4i_codec_regmap_config but decided against it 
since it's fine to use it on A10 and I think it's best if the name reflects 
the minimum required hardware.

On the other hand, once I moved the define, sun4i-codec won't compile if 
sun4i_codec_regmap_config is left at the top. So I had to move it, too.

It will be clearer once I post a patch doing just the preparation of the 
A10/A20 split.

I just checked A10 vs A20 some more:
There's also SUN4I_CODEC_AC_SYS_VERI 0x38 present in original ASoC and in 4.4-rc2.
It's unused by us, not mentioned in the A10 User manual V1.5 20130820, and called 
"AC_DAC_CAL" in the A20 User Manual v1.4 20150510. Ok to delete? 
Or is it better to rename it to "SUN7I_CODEC_AC_DAC_CAL" rather than delete?

> >  static int sun4i_codec_probe(struct platform_device *pdev)
> >  {
> >  	struct snd_soc_card *card;
> > @@ -593,6 +740,7 @@ static int sun4i_codec_probe(struct platform_device *pdev)
> >  	struct resource *res;
> >  	void __iomem *base;
> >  	int ret;
> > +	const struct snd_soc_codec_driver* codec_codec;
> 
> I guess a single codec is enough :)

Modeled after the name of the original variable, see below :)

But OK, I'll rename it to "codec".

Note: the newest original ASoC sun4i-codec has a variable
  "struct sun4i_codec *scodec;"
as well in the same function (which is a different thing).

> > +	if (of_device_is_compatible(pdev->dev.of_node, 
> > +				    "allwinner,sun7i-a20-codec"))
> > +		codec_codec = &sun7i_codec_codec;
> > +	else
> > +		codec_codec = &sun4i_codec_codec;
> > +	ret = snd_soc_register_codec(&pdev->dev, codec_codec,
> >  				     &sun4i_codec_dai, 1);

Thanks,
   Danny
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