regulator: core: Add set_voltage_time op
The new op is analogous to set_voltage_time_sel. It can be used by regulators which don't have a table of discrete voltages. The function returns the time for the regulator output voltage to stabilize after being set to a new value, in microseconds. If the op is not set a default implementation is used to calculate the delay. This change also removes the ramp_delay calculation in the PWM regulator, since the driver now uses the core code for the calculation of the delay. Signed-off-by:Matthias Kaehlcke <mka@chromium.org> Signed-off-by:
Mark Brown <broonie@kernel.org>
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