ASoC: tlv320adcx140: Add controls for PDM clk

Add ALSA controls to configure the PDM clocks.
The clocks need to be configurable to accommodate various microphones
that use clocks for low power/low resolution modes to high power/high
resolution modes.
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Link: https://lore.kernel.org/r/20200514123338.20392-1-dmurphy@ti.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/tlv320adcx140.c

@@ -180,6 +180,17 @@ static const struct snd_kcontrol_new decimation_filter_controls[] = {
 	SOC_DAPM_ENUM("Decimation Filter", decimation_filter_enum),
 };
 
+static const char * const pdmclk_text[] = {
+	"2.8224 MHz", "1.4112 MHz", "705.6 kHz", "5.6448 MHz"
+};
+
+static SOC_ENUM_SINGLE_DECL(pdmclk_select_enum, ADCX140_PDMCLK_CFG, 0,
+			    pdmclk_text);
+
+static const struct snd_kcontrol_new pdmclk_div_controls[] = {
+	SOC_DAPM_ENUM("PDM Clk Divider Select", pdmclk_select_enum),
+};
+
 static const char * const resistor_text[] = {
 	"2.5 kOhm", "10 kOhm", "20 kOhm"
 };
@@ -416,6 +427,9 @@ static const struct snd_soc_dapm_widget adcx140_dapm_widgets[] = {
 	SND_SOC_DAPM_MUX("IN4 Analog Mic Resistor", SND_SOC_NOPM, 0, 0,
 			in4_resistor_controls),
 
+	SND_SOC_DAPM_MUX("PDM Clk Div Select", SND_SOC_NOPM, 0, 0,
+			pdmclk_div_controls),
+
 	SND_SOC_DAPM_MUX("Decimation Filter", SND_SOC_NOPM, 0, 0,
 			decimation_filter_controls),
 };
@@ -493,6 +507,11 @@ static const struct snd_soc_dapm_route adcx140_audio_map[] = {
 	{"IN4 Analog Mic Resistor", "10 kOhm", "MIC4M Input Mux"},
 	{"IN4 Analog Mic Resistor", "20 kOhm", "MIC4M Input Mux"},
 
+	{"PDM Clk Div Select", "2.8224 MHz", "MIC1P Input Mux"},
+	{"PDM Clk Div Select", "1.4112 MHz", "MIC1P Input Mux"},
+	{"PDM Clk Div Select", "705.6 kHz", "MIC1P Input Mux"},
+	{"PDM Clk Div Select", "5.6448 MHz", "MIC1P Input Mux"},
+
 	{"MIC1 Analog Mux", "Line In", "MIC1P"},
 	{"MIC2 Analog Mux", "Line In", "MIC2P"},
 	{"MIC3 Analog Mux", "Line In", "MIC3P"},