TAS2552: Linux driver to support DOUT

Would you be so kind and let me know which current Linux driver you used?

Hi Shenghao,

The driver is the same as TI provided on https://www.ti.com/tool/TAS2552SW-LINUX

And the Linux kernel have included this driver at sound/soc/codecs/tas2552.c

You must setup tx path for DOUT signal

Kindly node the newly-added with bold font as following

/* TAS2552 dai structure. */
static struct snd_soc_dai_driver tas2552_dai[] = {
	{
		.name = "tas2552-amplifier",
		.playback = {
			.stream_name = "Playback",
			.channels_min = 2,
			.channels_max = 2,
			.rates = SNDRV_PCM_RATE_8000_192000,
			.formats = TAS2552_FORMATS,
		},

		.capture = { 
.stream_name = "Capture",

.channels_min = 2,
			.channels_max = 2,
			.rates = SNDRV_PCM_RATE_8000_192000,
			.formats = TAS2552_FORMATS,

},

 .ops = &tas2552_speaker_dai_ops, 
}, 
};

static const struct snd_soc_dapm_widget tas2552_dapm_widgets[] =
{
	SND_SOC_DAPM_INPUT("IN"),
	/* MUX Controls */
	SND_SOC_DAPM_MUX("Input selection", SND_SOC_NOPM, 0, 0,
			 &tas2552_input_mux_control),
	SND_SOC_DAPM_AIF_IN("DAC IN", "DAC Playback", 0, SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_AIF_OUT("ASI OUT", "DAC Capture", 0, SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_DAC("DAC", NULL, SND_SOC_NOPM, 0, 0),
SND_SOC_DAPM_OUT_DRV("ClassD", TAS2552_CFG_2, 7, 0, NULL, 0), 
SND_SOC_DAPM_SUPPLY("PLL", TAS2552_CFG_2, 3, 0, NULL, 0), 
SND_SOC_DAPM_POST("Post Event", tas2552_post_event), 
SND_SOC_DAPM_OUTPUT("OUT"),
SND_SOC_DAPM_INPUT("DMIC")
};

static const struct snd_soc_dapm_route tas2552_audio_map[] = {
	{"DAC", NULL, "DAC IN"},
	{"Input selection", "Digital", "DAC"},
	{"Input selection", "Analog", "IN"},
	{"ClassD", NULL, "Input selection"},
	{"OUT", NULL, "ClassD"},
	{"ClassD", NULL, "PLL"},
{"ASI OUT", NULL, "DMIC"}
};

As to how to config the rgister, I will involve our tas2552 expert to support you.
Remember to set the DOUT related register before setting chip power on. 

Hi Shenghao,

Thanks a lot! I now can see the capture interface by "arecord -l".

Looking forward to the registers configuration.