ASoC: Implement WM8903 oversampling rate controls

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

sound/soc/codecs/wm8903.c

@@ -481,6 +481,16 @@ static const char *hpf_mode_text[] = {
 static const struct soc_enum hpf_mode =
 	SOC_ENUM_SINGLE(WM8903_ADC_DIGITAL_0, 5, 4, hpf_mode_text);
 
+static const char *osr_text[] = {
+	"Low power", "High performance"
+};
+
+static const struct soc_enum adc_osr =
+	SOC_ENUM_SINGLE(WM8903_ANALOGUE_ADC_0, 0, 2, osr_text);
+
+static const struct soc_enum dac_osr =
+	SOC_ENUM_SINGLE(WM8903_DAC_DIGITAL_1, 0, 2, osr_text);
+
 static const char *drc_slope_text[] = {
 	"1", "1/2", "1/4", "1/8", "1/16", "0"
 };
@@ -619,6 +629,7 @@ SOC_SINGLE("Right Input PGA Common Mode Switch", WM8903_ANALOGUE_RIGHT_INPUT_1,
 	   6, 1, 0),
 
 /* ADCs */
+SOC_ENUM("ADC OSR", adc_osr),
 SOC_SINGLE("HPF Switch", WM8903_ADC_DIGITAL_0, 4, 1, 0),
 SOC_ENUM("HPF Mode", hpf_mode),
 SOC_SINGLE("DRC Switch", WM8903_DRC_0, 15, 1, 0),
@@ -650,6 +661,7 @@ SOC_DOUBLE_TLV("Digital Sidetone Volume", WM8903_DAC_DIGITAL_0, 4, 8,
 	       12, 0, digital_sidetone_tlv),
 
 /* DAC */
+SOC_ENUM("DAC OSR", dac_osr),
 SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8903_DAC_DIGITAL_VOLUME_LEFT,
 		 WM8903_DAC_DIGITAL_VOLUME_RIGHT, 1, 120, 0, digital_tlv),
 SOC_ENUM("DAC Soft Mute Rate", soft_mute),