regulator: lp87565: Add margin while populating ramp_delay

The slew rate might need a +/- 15% margin as per the latest data manual:

	http://www.ti.com/lit/ds/snvsb22/snvsb22.pdf

Hence take a conservative approach to program 85% of the original
hardware slew rate so that the software accommodates the margin
delay while voltage switching. Hence reduce the default ramp_delay
populated in the descriptors also by 15%.

Signed-off-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/regulator/lp87565-regulator.c b/drivers/regulator/lp87565-regulator.c
index cfdbe294fb6af9cc5a33ca8484d982ece53e6ed6..5a4ea996e1dc075e25b0f2fa7b4318437643ff0f 100644 (file)
--- a/drivers/regulator/lp87565-regulator.c
+++ b/drivers/regulator/lp87565-regulator.c
@@ -95,6 +95,10 @@ static int lp87565_buck_set_ramp_delay(struct regulator_dev *rdev,
 
        rdev->constraints->ramp_delay = lp87565_buck_ramp_delay[reg];
 
+       /* Conservatively give a 15% margin */
+       rdev->constraints->ramp_delay =
+                               rdev->constraints->ramp_delay * 85 / 100;
+
        return 0;
 }
 
@@ -154,32 +158,32 @@ static const struct lp87565_regulator regulators[] = {
        LP87565_REGULATOR("BUCK0", LP87565_BUCK_0, "buck0", lp87565_buck_ops,
                          256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
                          LP87565_REG_BUCK0_CTRL_1,
-                         LP87565_BUCK_CTRL_1_EN, 3800,
+                         LP87565_BUCK_CTRL_1_EN, 3230,
                          buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
        LP87565_REGULATOR("BUCK1", LP87565_BUCK_1, "buck1", lp87565_buck_ops,
                          256, LP87565_REG_BUCK1_VOUT, LP87565_BUCK_VSET,
                          LP87565_REG_BUCK1_CTRL_1,
-                         LP87565_BUCK_CTRL_1_EN, 3800,
+                         LP87565_BUCK_CTRL_1_EN, 3230,
                          buck0_1_2_3_ranges, LP87565_REG_BUCK1_CTRL_2),
        LP87565_REGULATOR("BUCK2", LP87565_BUCK_2, "buck2", lp87565_buck_ops,
                          256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
                          LP87565_REG_BUCK2_CTRL_1,
-                         LP87565_BUCK_CTRL_1_EN, 3800,
+                         LP87565_BUCK_CTRL_1_EN, 3230,
                          buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
        LP87565_REGULATOR("BUCK3", LP87565_BUCK_3, "buck3", lp87565_buck_ops,
                          256, LP87565_REG_BUCK3_VOUT, LP87565_BUCK_VSET,
                          LP87565_REG_BUCK3_CTRL_1,
-                         LP87565_BUCK_CTRL_1_EN, 3800,
+                         LP87565_BUCK_CTRL_1_EN, 3230,
                          buck0_1_2_3_ranges, LP87565_REG_BUCK3_CTRL_2),
        LP87565_REGULATOR("BUCK10", LP87565_BUCK_10, "buck10", lp87565_buck_ops,
                          256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
                          LP87565_REG_BUCK0_CTRL_1,
-                         LP87565_BUCK_CTRL_1_EN, 3800,
+                         LP87565_BUCK_CTRL_1_EN, 3230,
                          buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
        LP87565_REGULATOR("BUCK23", LP87565_BUCK_23, "buck23", lp87565_buck_ops,
                          256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
                          LP87565_REG_BUCK2_CTRL_1,
-                         LP87565_BUCK_CTRL_1_EN, 3800,
+                         LP87565_BUCK_CTRL_1_EN, 3230,
                          buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
 };