regulator: Support voltage offsets to compensate for drops in system

Some systems, particularly physically large systems used for early
prototyping, may experience substantial voltage drops between the regulator
and the consumers as a result of long traces in the system. With these
systems voltages may need to be set higher than requested in order to
ensure reliable system operation.

Allow systems to work around such hardware issues by allowing constraints
to supply an offset to be applied to any requested and reported voltages.
This is not ideal, especially since the voltage drop may be load dependant,
but is sufficient for most affected systems, it is not expected to be used
in production hardware. The offset is applied after all constraint
processing so constraints should be specified in terms of consumer values
not physically configured values.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 12 insertions, 3 deletions

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 432faa5cb8af..58452ac0f165 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -724,6 +724,10 @@ static void print_constraints(struct regulator_dev *rdev)
                         count += sprintf(buf + count, "at %d mV ", ret / 1000);
         }
 
+        if (constraints->uV_offset)
+                count += sprintf(buf, "%dmV offset ",
+                                 constraints->uV_offset / 1000);
+
         if (constraints->min_uA && constraints->max_uA) {
                 if (constraints->min_uA == constraints->max_uA)
                         count += sprintf(buf + count, "%d mA ",
@@ -1641,6 +1645,9 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
 
         trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
 
+        min_uV += rdev->constraints->uV_offset;
+        max_uV += rdev->constraints->uV_offset;
+
         if (rdev->desc->ops->set_voltage) {
                 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
                                                    &selector);
@@ -1865,18 +1872,20 @@ EXPORT_SYMBOL_GPL(regulator_sync_voltage);
 
 static int _regulator_get_voltage(struct regulator_dev *rdev)
 {
-        int sel;
+        int sel, ret;
 
         if (rdev->desc->ops->get_voltage_sel) {
                 sel = rdev->desc->ops->get_voltage_sel(rdev);
                 if (sel < 0)
                         return sel;
-                return rdev->desc->ops->list_voltage(rdev, sel);
+                ret = rdev->desc->ops->list_voltage(rdev, sel);
         }
         if (rdev->desc->ops->get_voltage)
-                return rdev->desc->ops->get_voltage(rdev);
+                ret = rdev->desc->ops->get_voltage(rdev);
         else
                 return -EINVAL;
+
+        return ret - rdev->constraints->uV_offset;
 }
 
 /**