ASoC: ts3a227e: Add dts property that allows to specify micbias voltage

The voltage controls key press threshold.

Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

2 files changed, 32 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/sound/ts3a227e.txt b/Documentation/devicetree/bindings/sound/ts3a227e.txt
index e8bf23eb1803..a836881d9608 100644
--- a/Documentation/devicetree/bindings/sound/ts3a227e.txt
+++ b/Documentation/devicetree/bindings/sound/ts3a227e.txt
@@ -13,6 +13,11 @@ Required properties:
  - interrupt-parent:    The parent interrupt controller
  - interrupts:          Interrupt number for /INT pin from the 227e
 
+Optional properies:
+ - ti,micbias:   Intended MICBIAS voltage (datasheet section 9.6.7).
+      Select 0/1/2/3/4/5/6/7 to specify MACBIAS voltage
+      2.1V/2.2V/2.3V/2.4V/2.5V/2.6V/2.7V/2.8V
+      Default value is "1" (2.2V).
 
 Examples:
 
diff --git a/sound/soc/codecs/ts3a227e.c b/sound/soc/codecs/ts3a227e.c
index b55034f63de5..65f8ec2094fb 100644
--- a/sound/soc/codecs/ts3a227e.c
+++ b/sound/soc/codecs/ts3a227e.c
@@ -79,6 +79,10 @@ static const int ts3a227e_buttons[] = {
 /* TS3A227E_REG_SETTING_2 0x05 */
 #define KP_ENABLE 0x04
 
+/* TS3A227E_REG_SETTING_3 0x06 */
+#define MICBIAS_SETTING_SFT (3)
+#define MICBIAS_SETTING_MASK (0x7 << MICBIAS_SETTING_SFT)
+
 /* TS3A227E_REG_ACCESSORY_STATUS  0x0b */
 #define TYPE_3_POLE 0x01
 #define TYPE_4_POLE_OMTP 0x02
@@ -248,6 +252,21 @@ static const struct regmap_config ts3a227e_regmap_config = {
         .num_reg_defaults = ARRAY_SIZE(ts3a227e_reg_defaults),
 };
 
+static int ts3a227e_parse_dt(struct ts3a227e *ts3a227e, struct device_node *np)
+{
+        u32 micbias;
+        int err;
+
+        err = of_property_read_u32(np, "ti,micbias", &micbias);
+        if (!err) {
+                regmap_update_bits(ts3a227e->regmap, TS3A227E_REG_SETTING_3,
+                        MICBIAS_SETTING_MASK,
+                        (micbias & 0x07) << MICBIAS_SETTING_SFT);
+        }
+
+        return 0;
+}
+
 static int ts3a227e_i2c_probe(struct i2c_client *i2c,
                               const struct i2c_device_id *id)
 {
@@ -265,6 +284,14 @@ static int ts3a227e_i2c_probe(struct i2c_client *i2c,
         if (IS_ERR(ts3a227e->regmap))
                 return PTR_ERR(ts3a227e->regmap);
 
+        if (dev->of_node) {
+                ret = ts3a227e_parse_dt(ts3a227e, dev->of_node);
+                if (ret) {
+                        dev_err(dev, "Failed to parse device tree: %d\n", ret);
+                        return ret;
+                }
+        }
+
         ret = devm_request_threaded_irq(dev, i2c->irq, NULL, ts3a227e_interrupt,
                                         IRQF_TRIGGER_LOW | IRQF_ONESHOT,
                                         "TS3A227E", ts3a227e);