regulator: s5m8767: Define symbol for buck control mask

Replace hard-coded value for mask used in BUCKX_CTRL registers (for
BUCKX_EN field) with a symbol. This also removes two local variables.
Signed-off-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
Acked-by: NLee Jones <lee.jones@linaro.org>
Reviewed-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NMark Brown <broonie@linaro.org>

drivers/regulator/s5m8767.c

@@ -217,7 +217,7 @@ static int s5m8767_reg_is_enabled(struct regulator_dev *rdev)
 {
 	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);
 	int ret, reg;
-	int mask = 0xc0, enable_ctrl;
+	int enable_ctrl;
 	unsigned int val;
 
 	ret = s5m8767_get_register(rdev, &reg, &enable_ctrl);
@@ -230,27 +230,28 @@ static int s5m8767_reg_is_enabled(struct regulator_dev *rdev)
 	if (ret)
 		return ret;
 
-	return (val & mask) == enable_ctrl;
+	return (val & S5M8767_ENCTRL_MASK) == enable_ctrl;
 }
 
 static int s5m8767_reg_enable(struct regulator_dev *rdev)
 {
 	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);
 	int ret, reg;
-	int mask = 0xc0, enable_ctrl;
+	int enable_ctrl;
 
 	ret = s5m8767_get_register(rdev, &reg, &enable_ctrl);
 	if (ret)
 		return ret;
 
-	return sec_reg_update(s5m8767->iodev, reg, enable_ctrl, mask);
+	return sec_reg_update(s5m8767->iodev, reg, enable_ctrl,
+			S5M8767_ENCTRL_MASK);
 }
 
 static int s5m8767_reg_disable(struct regulator_dev *rdev)
 {
 	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);
 	int ret, reg;
-	int  mask = 0xc0, enable_ctrl;
+	int mask = S5M8767_ENCTRL_MASK, enable_ctrl;
 
 	ret = s5m8767_get_register(rdev, &reg, &enable_ctrl);
 	if (ret)

include/linux/mfd/samsung/s5m8767.h

@@ -184,5 +184,6 @@ enum s5m8767_regulators {
 };
 
 #define S5M8767_ENCTRL_SHIFT		6
+#define S5M8767_ENCTRL_MASK		(0x3 << S5M8767_ENCTRL_SHIFT)
 
 #endif /* __LINUX_MFD_S5M8767_H */