ASoC: nau8825: Add delay control for input path

Change the original fixed delay to the assignment from property. It will make
more flexible to different platforms for avoiding pop noise at the beginning
of recording.

Signed-off-by: David Lin <CTLIN0@nuvoton.com>
Link: https://lore.kernel.org/r/20230414103941.39566-2-CTLIN0@nuvoton.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: David Lin

sound/soc/codecs/nau8825.c

@@ -919,7 +919,7 @@ static int nau8825_adc_event(struct snd_soc_dapm_widget *w,
 
 	switch (event) {
 	case SND_SOC_DAPM_POST_PMU:
-		msleep(125);
+		msleep(nau8825->adc_delay);
 		regmap_update_bits(nau8825->regmap, NAU8825_REG_ENA_CTRL,
 			NAU8825_ENABLE_ADC, NAU8825_ENABLE_ADC);
 		break;
@@ -2752,6 +2752,7 @@ static void nau8825_print_device_properties(struct nau8825 *nau8825)
 	dev_dbg(dev, "crosstalk-enable:     %d\n",
 			nau8825->xtalk_enable);
 	dev_dbg(dev, "adcout-drive-strong:  %d\n", nau8825->adcout_ds);
+	dev_dbg(dev, "adc-delay-ms:         %d\n", nau8825->adc_delay);
 }
 
 static int nau8825_read_device_properties(struct device *dev,
@@ -2819,6 +2820,11 @@ static int nau8825_read_device_properties(struct device *dev,
 	nau8825->xtalk_enable = device_property_read_bool(dev,
 		"nuvoton,crosstalk-enable");
 	nau8825->adcout_ds = device_property_read_bool(dev, "nuvoton,adcout-drive-strong");
+	ret = device_property_read_u32(dev, "nuvoton,adc-delay-ms", &nau8825->adc_delay);
+	if (ret)
+		nau8825->adc_delay = 125;
+	if (nau8825->adc_delay < 125 && nau8825->adc_delay > 500)
+		dev_warn(dev, "Please set the suitable delay time!\n");
 
 	nau8825->mclk = devm_clk_get(dev, "mclk");
 	if (PTR_ERR(nau8825->mclk) == -EPROBE_DEFER) {

sound/soc/codecs/nau8825.h

@@ -517,6 +517,7 @@ struct nau8825 {
 	int xtalk_enable;
 	bool xtalk_baktab_initialized; /* True if initialized. */
 	bool adcout_ds;
+	int adc_delay;
 };
 
 int nau8825_enable_jack_detect(struct snd_soc_component *component,