Fix below checkpatch warnings:

$ scripts/checkpatch.pl -f drivers/regulator/max77686.c
ERROR: return is not a function, parentheses are not required
+       return (DIV_ROUND_UP(rdev->desc->uV_step

WARNING: line over 80 characters
+       .ops            = &max77686_buck_dvs_ops,                               \

total: 1 errors, 1 warnings, 339 lines checked
Signed-off-by: NAxel Lin <axel.lin@gmail.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

Both max77686_ops and max77686_buck_dvs_ops use simple linear voltage maps.
Thus use regulator_map_voltage_linear is more efficient than using the defult
regulator_map_voltage_iterate.
Signed-off-by: NAxel Lin <axel.lin@gmail.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

Add driver for support max77686 regulator.
MAX77686 provides LDOs[1~26] and BUCKs[1~9]. It support to set or get the
volatege of regulator on max77686 chip with using regmap.
Signed-off-by: NChiwoong Byun <woong.byun@samsung.com>
Signed-off-by: NJonghwa Lee <jonghwa3.lee@samsung.com>
Signed-off-by: NMyungjoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: NYadwinder Singh Brar <yadi.brar@samsung.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>