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 <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/codecs/nau8825.c

···
 
 	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;
···
 	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,
···
 	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

···
 	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,