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, 4 insertions, 0 deletions

diff --git a/include/linux/regulator/machine.h b/include/linux/regulator/machine.h
index 8f1a55d99494..ce3127a75c88 100644
--- a/include/linux/regulator/machine.h
+++ b/include/linux/regulator/machine.h
@@ -68,6 +68,8 @@ struct regulator_state {
  *
  * @min_uV: Smallest voltage consumers may set.
  * @max_uV: Largest voltage consumers may set.
+ * @uV_offset: Offset applied to voltages from consumer to compensate for
+ *             voltage drops.
  *
  * @min_uA: Smallest consumers consumers may set.
  * @max_uA: Largest current consumers may set.
@@ -99,6 +101,8 @@ struct regulation_constraints {
 	int min_uV;
 	int max_uV;
 
+	int uV_offset;
+
 	/* current output range (inclusive) - for current control */
 	int min_uA;
 	int max_uA;