[alsa-devel] [PATCH] ASoC: add RT5640 CODEC driver

Bard Liao bardliao at realtek.com
Wed Jun 5 12:02:13 CEST 2013

> On 05/31/2013 01:04 AM, bardliao at realtek.com wrote:
> > From: Bard Liao <bardliao at realtek.com>
> >
> > * Use regmap_range_cfg to replace index read/write function.
> > * Remove I2S3 related code since there is no I2S3 in ALC5640.
> > * Remove Voice DSP related code since there is no Voice DSP in ALC5640.
> > * Remove MICBIAS2 since there is no MICBIAS2 in ALC5640.
> > * Change DMIC1/2 CLK to DMIC1/2 Power since it is for enable/disable DMIC1/2
> > * Modify some texts for consistent coding style.
> > * Merge sto adc l/r mux since it shares the same control bits.
> > * Other minor changes.
> > +static const struct snd_soc_dapm_widget rt5640_dapm_widgets[] = {
> > +     /* Input Lines */
> > +     SND_SOC_DAPM_INPUT("DMIC1"),
> > +     SND_SOC_DAPM_INPUT("DMIC2"),
> Can you explain that more? In the spec for this part, I don't see any
> DMIC1/2 input pins. Instead, I think they're alternative uses for the
> IN1P/N pins, right?

Yes, DMIC1/2 are alternative uses for the IN1P/N pins.
If you connect it with a DMIC, it will work as a DMIC input.
There are DMIC1/2 component in ALC5640. 
You can see chapter 4.3 Digital Mixer Path in ALC5640 datasheet for reference.
If IN1P/N use as DMIC1/2, the audio path should go through DMIC1/DMIC2.

> In an earlier review, IIRC, Mark had asked you to implement platform
> data to configure whether the microphones were single-ended or not. I
> don't see that in this patch.

Ok, I will implement the microphones type configuration in my patch.
I thought it will be add in the DT patch.

> Finally, I really would prefer if you could implement the support for
> the LDO1_EN GPIO via platform data. Getting that right requires a bit of
> knowledge of how set_bias_level() is supposed to work on this CODEC, and
> I think Realtek have the best information to get that right. I'll
> certainly send a patch to implement this all by device tree after that.

I will do that also, if I have question I will ask you.

> Anyway, I'll go test this patch and see if it works for me on my HW.
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