ASoC: Implement WM8994/58 DAC and ADC oversampling control

The oversampling rate of the DAC and ADC can be controlled to optimise
for either low power consumption or maximum performance.

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

diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c
index da48802340fcdfb0e761bfc3d9c931085b51cc6c..e59691a7b34207620aa33038d2e5056df5f5bc20 100644 (file)
--- a/sound/soc/codecs/wm8994.c
+++ b/sound/soc/codecs/wm8994.c
@@ -558,6 +558,16 @@ static const struct soc_enum aif2dacl_src =
 static const struct soc_enum aif2dacr_src =
        SOC_ENUM_SINGLE(WM8994_AIF2_CONTROL_2, 14, 2, aif_chan_src_text);
 
+static const char *osr_text[] = {
+       "Low Power", "High Performance",
+};
+
+static const struct soc_enum dac_osr =
+       SOC_ENUM_SINGLE(WM8994_OVERSAMPLING, 0, 2, osr_text);
+
+static const struct soc_enum adc_osr =
+       SOC_ENUM_SINGLE(WM8994_OVERSAMPLING, 1, 2, osr_text);
+
 static void wm8958_mbc_apply(struct snd_soc_codec *codec, int mbc, int start)
 {
        struct wm8994_priv *wm8994 = snd_soc_codec_get_drvdata(codec);
@@ -834,6 +844,9 @@ SOC_DOUBLE("AIF1ADC2 HPF Switch", WM8994_AIF1_ADC2_FILTERS, 12, 11, 1, 0),
 SOC_ENUM("AIF2ADC HPF Mode", aif2adc_hpf),
 SOC_DOUBLE("AIF2ADC HPF Switch", WM8994_AIF2_ADC_FILTERS, 12, 11, 1, 0),
 
+SOC_ENUM("ADC OSR", adc_osr),
+SOC_ENUM("DAC OSR", dac_osr),
+
 SOC_DOUBLE_R_TLV("DAC1 Volume", WM8994_DAC1_LEFT_VOLUME,
                 WM8994_DAC1_RIGHT_VOLUME, 1, 96, 0, digital_tlv),
 SOC_DOUBLE_R("DAC1 Switch", WM8994_DAC1_LEFT_VOLUME,