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regulator: pfuze100: Simplify pfuze100_set_ramp_delay implementation 

Simplify the equation to calculate ramp_delay.
Below equations are equivalent:
  ramp_delay = 25000 / (2 * ramp_delay);
  ramp_delay = 50000 / (4 * ramp_delay);
  ramp_delay = 25000 / (2 * ramp_delay);
  ramp_delay = 12500 / ramp_delay;
So we don't need to read BIT6 of rdev->desc->vsel_reg for applying different
equations.

Also use rdev->desc->vsel_reg instead of run-time calculate register address.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Reviewed-by: Robin Gong <b38343@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Axel Lin 2013-07-30 22:47:44 +08:00 committed by Mark Brown
parent d9493234e2
commit e56566699c
1 changed files with 5 additions and 16 deletions
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21
drivers/regulator/pfuze100-regulator.c
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@ -93,26 +93,15 @@ static int pfuze100_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
{
struct pfuze_chip *pfuze100 = rdev_get_drvdata(rdev);
int id = rdev->desc->id;
unsigned int val, ramp_bits, reg;
unsigned int ramp_bits;
int ret;
if (id < PFUZE100_SWBST) {
if (id == PFUZE100_SW1AB)
reg = PFUZE100_SW1ABVOL;
else
reg = PFUZE100_SW1CVOL + (id - PFUZE100_SW1C) * 7;
regmap_read(pfuze100->regmap, reg, &val);
if (id <= PFUZE100_SW1C)
ramp_delay = 25000 / (2 * ramp_delay);
else if (val & 0x40)
ramp_delay = 50000 / (4 * ramp_delay);
else
ramp_delay = 25000 / (2 * ramp_delay);
ramp_delay = 12500 / ramp_delay;
ramp_bits = (ramp_delay >> 1) - (ramp_delay >> 3);
ret = regmap_update_bits(pfuze100->regmap, reg + 4 , 0xc0,
ramp_bits << 6);
ret = regmap_update_bits(pfuze100->regmap,
rdev->desc->vsel_reg + 4,
0xc0, ramp_bits << 6);
if (ret < 0)
dev_err(pfuze100->dev, "ramp failed, err %d\n", ret);
} else