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>
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