[PATCH] ASoC: wm8731: Fix a unused function gcc warning

[zhong jiang]

Fix the following compile warning:

sound/soc/codecs/wm8731.c:575:12: warning: 'wm8731_request_supplies' defined 
but not used [-Wunused-function]
sound/soc/codecs/wm8731.c:600:12: warning: 'wm8731_hw_init' defined but not 
used [-Wunused-function]

Signed-off-by: zhong jiang <zhongji...@huawei.com>
---
 sound/soc/codecs/wm8731.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sound/soc/codecs/wm8731.c b/sound/soc/codecs/wm8731.c
index 7c8fad8..b5dc6ba2 100644
--- a/sound/soc/codecs/wm8731.c
+++ b/sound/soc/codecs/wm8731.c
@@ -36,12 +36,15 @@
 #include "wm8731.h"
 
 #define WM8731_NUM_SUPPLIES 4
+
+#if defined(CONFIG_I2C) || defined(CONFIG_SPI_MASTER)
 static const char *wm8731_supply_names[WM8731_NUM_SUPPLIES] = {
        "AVDD",
        "HPVDD",
        "DCVDD",
        "DBVDD",
 };
+#endif
 
 /* codec private data */
 struct wm8731_priv {
@@ -572,6 +575,7 @@ static int wm8731_startup(struct snd_pcm_substream 
*substream,
        .symmetric_rates = 1,
 };
 
+#if defined(CONFIG_I2C) || defined(CONFIG_SPI_MASTER)
 static int wm8731_request_supplies(struct device *dev,
                struct wm8731_priv *wm8731)
 {
@@ -627,6 +631,7 @@ static int wm8731_hw_init(struct device *dev, struct 
wm8731_priv *wm8731)
 
        return ret;
 }
+#endif
 
 static const struct snd_soc_component_driver soc_component_dev_wm8731 = {
        .set_bias_level         = wm8731_set_bias_level,
-- 
1.7.12.4