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>
diff --git a/sound/soc/codecs/tas5086.c b/sound/soc/codecs/tas5086.c
index bcbbec1..72067f7 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 @@
{
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);