[PATCH] regmap: sdw: add required header files

[Bard Liao]

From: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>

Explicitly add header files used by regmap SoundWire support.

Suggested-by: Guennadi Liakhovetski <guennadi.liakhovetski at linux.intel.com>
Reviewed-by: Rander Wang <rander.wang at linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski at linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen at linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao at linux.intel.com>
---
 drivers/base/regmap/regmap-sdw.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/base/regmap/regmap-sdw.c b/drivers/base/regmap/regmap-sdw.c
index c92d614b4943..c83be26434e7 100644
--- a/drivers/base/regmap/regmap-sdw.c
+++ b/drivers/base/regmap/regmap-sdw.c
@@ -2,7 +2,9 @@
 // Copyright(c) 2015-17 Intel Corporation.
 
 #include <linux/device.h>
+#include <linux/errno.h>
 #include <linux/module.h>
+#include <linux/regmap.h>
 #include <linux/soundwire/sdw.h>
 #include "internal.h"
 
-- 
2.17.1