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>

1 files changed, 0 insertions, 10 deletions

diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c
index c24524242da2..1b88e0e15a70 100644
--- a/drivers/regulator/pwm-regulator.c
+++ b/drivers/regulator/pwm-regulator.c
@@ -10,7 +10,6 @@
  * published by the Free Software Foundation.
  */
 
-#include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/err.h>
@@ -194,12 +193,10 @@ static int pwm_regulator_set_voltage(struct regulator_dev *rdev,
         unsigned int min_uV_duty = drvdata->continuous.min_uV_dutycycle;
         unsigned int max_uV_duty = drvdata->continuous.max_uV_dutycycle;
         unsigned int duty_unit = drvdata->continuous.dutycycle_unit;
-        unsigned int ramp_delay = rdev->constraints->ramp_delay;
         int min_uV = rdev->constraints->min_uV;
         int max_uV = rdev->constraints->max_uV;
         int diff_uV = max_uV - min_uV;
         struct pwm_state pstate;
-        int old_uV = pwm_regulator_get_voltage(rdev);
         unsigned int diff_duty;
         unsigned int dutycycle;
         int ret;
@@ -233,13 +230,6 @@ static int pwm_regulator_set_voltage(struct regulator_dev *rdev,
                 return ret;
         }
 
-        if ((ramp_delay == 0) || !pwm_regulator_is_enabled(rdev))
-                return 0;
-
-        /* Ramp delay is in uV/uS. Adjust to uS and delay */
-        ramp_delay = DIV_ROUND_UP(abs(req_min_uV - old_uV), ramp_delay);
-        usleep_range(ramp_delay, ramp_delay + DIV_ROUND_UP(ramp_delay, 10));
-
         return 0;
 }