mfd: max77693: Add TORCH_IOUT_MASK macro

Add a macro for obtaining the mask of ITORCH register bit fields
related either to FLED1 or FLED2 current output. The expected
arguments are TORCH_IOUT1_SHIFT or TORCH_IOUT2_SHIFT.
Signed-off-by: NJacek Anaszewski <j.anaszewski@samsung.com>
Acked-by: NKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

include/linux/mfd/max77693-private.h

@@ -87,6 +87,7 @@ enum max77693_pmic_reg {
 /* MAX77693 ITORCH register */
 #define TORCH_IOUT1_SHIFT	0
 #define TORCH_IOUT2_SHIFT	4
+#define TORCH_IOUT_MASK(x)	(0xf << (x))
 #define TORCH_IOUT_MIN		15625
 #define TORCH_IOUT_MAX		250000
 #define TORCH_IOUT_STEP		15625