ASoC: add HiFiBerry ADC8x 8-channel ADC to simple-card-driver

Definitions for the 8 channel ADC card. The card uses only
HW-controlled devices which allows the uses of the 'dummy-dai'.
It will run only on a PI5 as it requires the designware I2S0 module.

The necessary output lanes I2S0_DI[0..3] are claimed from within the
DT overlay.

Signed-off-by: j-schambacher <[email protected]>

Author: j-schambacher

sound/soc/bcm/Kconfig

@@ -47,6 +47,13 @@ config SND_BCM2708_SOC_HIFIBERRY_ADC
          Say Y or M if you want to add support for HifiBerry ADC.
          Use this module for HiFiBerry's ADC-only sound cards
 
+config SND_BCM2708_SOC_HIFIBERRY_ADC8X
+        tristate "Support for HifiBerry ADC8X"
+        select SND_RPI_SIMPLE_SOUNDCARD
+        help
+         Say Y or M if you want to add support for HifiBerry ADC8X.
+         Note: ADC8X only works on PI5
+
 config SND_BCM2708_SOC_HIFIBERRY_DAC
         tristate "Support for HifiBerry DAC and DAC8X"
         select SND_SOC_PCM5102A

sound/soc/bcm/rpi-simple-soundcard.c

@@ -254,6 +254,41 @@ static struct snd_rpi_simple_drvdata drvdata_hifiberrydacplusdsp = {
 	.dai       = snd_hifiberrydacplusdsp_soundcard_dai,
 };
 
+SND_SOC_DAILINK_DEFS(hifiberry_adc,
+	DAILINK_COMP_ARRAY(COMP_EMPTY()),
+	DAILINK_COMP_ARRAY(COMP_CODEC("snd-soc-dummy", "snd-soc-dummy-dai")),
+	DAILINK_COMP_ARRAY(COMP_EMPTY()));
+
+static int hifiberry_adc8x_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
+
+	/* set limits of 8 channels and 192ksps sample rate
+	 */
+	codec_dai->driver->capture.channels_max = 8;
+	codec_dai->driver->capture.rates = SNDRV_PCM_RATE_8000_192000;
+
+	return 0;
+}
+
+static struct snd_soc_dai_link snd_hifiberry_adc8x_dai[] = {
+	{
+		.name           = "HifiBerry ADC8x",
+		.stream_name    = "HifiBerry ADC8x HiFi",
+		.dai_fmt        = SND_SOC_DAIFMT_I2S |
+					SND_SOC_DAIFMT_NB_NF |
+					SND_SOC_DAIFMT_CBS_CFS,
+		.init           = hifiberry_adc8x_init,
+		SND_SOC_DAILINK_REG(hifiberry_adc),
+	},
+};
+
+static struct snd_rpi_simple_drvdata drvdata_hifiberry_adc8x = {
+	.card_name = "snd_rpi_hifiberry_adc8x",
+	.dai       = snd_hifiberry_adc8x_dai,
+	.fixed_bclk_ratio = 64,
+};
+
 SND_SOC_DAILINK_DEFS(hifiberry_amp,
 	DAILINK_COMP_ARRAY(COMP_EMPTY()),
 	DAILINK_COMP_ARRAY(COMP_CODEC("tas5713.1-001b", "tas5713-hifi")),
@@ -445,6 +480,8 @@ static const struct of_device_id snd_rpi_simple_of_match[] = {
 		.data = (void *) &drvdata_googlevoicehat },
 	{ .compatible = "hifiberrydacplusdsp,hifiberrydacplusdsp-soundcard",
 		.data = (void *) &drvdata_hifiberrydacplusdsp },
+	{ .compatible = "hifiberry,hifiberry-adc8x",
+		.data = (void *) &drvdata_hifiberry_adc8x },
 	{ .compatible = "hifiberry,hifiberry-amp",
 		.data = (void *) &drvdata_hifiberry_amp },
 	{ .compatible = "hifiberry,hifiberry-amp3",