diff options
| author | Daniel Mack <zonque@gmail.com> | 2013-06-24 18:25:32 +0400 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2013-06-25 13:26:49 +0400 |
| commit | 79b23b564060c5483a489562b01a6eb778a312f7 (patch) | |
| tree | 51581ce2a9ece9c6cd6ff3cf5e14e11627a6e196 /sound/soc | |
| parent | 18710acdeea02777ef70013465f6f7fced411096 (diff) | |
| download | linux-79b23b564060c5483a489562b01a6eb778a312f7.tar.xz | |
ASoC: tas5086: add support for pwm start mode config
The TAS5086 has two alternative modes to start its PWM channels, Mid-Z
and Low-Z. Which one to use depends on how the PWM power stages are
connected to the TAS5086.
This patch adds 6 optional boolean properties to the DT bindings of the
driver which allow the user to configure each individual channel to the
Mid-Z scheme, and leaves all the others to the default (Low-Z).
Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'sound/soc')
| -rw-r--r-- | sound/soc/codecs/tas5086.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/sound/soc/codecs/tas5086.c b/sound/soc/codecs/tas5086.c index bcbbec1399b8..72067f79633e 100644 --- a/sound/soc/codecs/tas5086.c +++ b/sound/soc/codecs/tas5086.c @@ -88,6 +88,10 @@ #define TAS5086_MAX_REGISTER TAS5086_PWM_OUTPUT_MUX +#define TAS5086_PWM_START_MIDZ_FOR_START_1 (1 << 7) +#define TAS5086_PWM_START_MIDZ_FOR_START_2 (1 << 6) +#define TAS5086_PWM_START_CHANNEL_MASK (0x3f) + /* * Default TAS5086 power-up configuration */ @@ -717,13 +721,31 @@ static int tas5086_probe(struct snd_soc_codec *codec) { struct tas5086_private *priv = snd_soc_codec_get_drvdata(codec); int charge_period = 1300000; /* hardware default is 1300 ms */ + u8 pwm_start = TAS5086_PWM_START_CHANNEL_MASK; int i, ret; if (of_match_device(of_match_ptr(tas5086_dt_ids), codec->dev)) { struct device_node *of_node = codec->dev->of_node; of_property_read_u32(of_node, "ti,charge-period", &charge_period); + + for (i = 0; i < 6; i++) { + char name[25]; + + snprintf(name, sizeof(name), + "ti,mid-z-channel-%d", i + 1); + + if (of_get_property(of_node, name, NULL) != NULL) + pwm_start &= ~(1 << i); + } } + /* + * Configure 'part 2' of the PWM starts to always use MID-Z, and tell + * all configured mid-z channels to start start under 'part 2'. + */ + regmap_write(priv->regmap, TAS5086_PWM_START, + TAS5086_PWM_START_MIDZ_FOR_START_2 | pwm_start); + /* lookup and set split-capacitor charge period */ if (charge_period == 0) { regmap_write(priv->regmap, TAS5086_SPLIT_CAP_CHARGE, 0); |