ASoC: tlv320aic32x4: Add rstn gpio to platform data.

Add the possibility to specify a gpio through platform data
so that a HW reset can be issued to the codec.

Signed-off-by: Javier Martin <javier.martin@vista-silicon.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/sound/soc/codecs/tlv320aic32x4.c b/sound/soc/codecs/tlv320aic32x4.c
index d7d0e18f794c..e39e08d5d8e4 100644
--- a/sound/soc/codecs/tlv320aic32x4.c
+++ b/sound/soc/codecs/tlv320aic32x4.c
@@ -28,6 +28,7 @@
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/pm.h>
+#include <linux/gpio.h>
 #include <linux/i2c.h>
 #include <linux/cdev.h>
 #include <linux/slab.h>
@@ -65,6 +66,7 @@ struct aic32x4_priv {
         u32 power_cfg;
         u32 micpga_routing;
         bool swapdacs;
+        int rstn_gpio;
 };
 
 /* 0dB min, 1dB steps */
@@ -627,10 +629,20 @@ static int aic32x4_probe(struct snd_soc_codec *codec)
 {
         struct aic32x4_priv *aic32x4 = snd_soc_codec_get_drvdata(codec);
         u32 tmp_reg;
+        int ret;
 
         codec->hw_write = (hw_write_t) i2c_master_send;
         codec->control_data = aic32x4->control_data;
 
+        if (aic32x4->rstn_gpio >= 0) {
+                ret = devm_gpio_request_one(codec->dev, aic32x4->rstn_gpio,
+                                GPIOF_OUT_INIT_LOW, "tlv320aic32x4 rstn");
+                if (ret != 0)
+                        return ret;
+                ndelay(10);
+                gpio_set_value(aic32x4->rstn_gpio, 1);
+        }
+
         snd_soc_write(codec, AIC32X4_RESET, 0x01);
 
         /* Power platform configuration */
@@ -723,10 +735,12 @@ static __devinit int aic32x4_i2c_probe(struct i2c_client *i2c,
                 aic32x4->power_cfg = pdata->power_cfg;
                 aic32x4->swapdacs = pdata->swapdacs;
                 aic32x4->micpga_routing = pdata->micpga_routing;
+                aic32x4->rstn_gpio = pdata->rstn_gpio;
         } else {
                 aic32x4->power_cfg = 0;
                 aic32x4->swapdacs = false;
                 aic32x4->micpga_routing = 0;
+                aic32x4->rstn_gpio = -1;
         }
 
         ret = snd_soc_register_codec(&i2c->dev,