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authorMark Brown <broonie@opensource.wolfsonmicro.com>2011-05-09 01:13:37 +0400
committerLiam Girdwood <lrg@slimlogic.co.uk>2011-05-27 13:34:37 +0400
commitbf5892a8167e4aa5a9a6d72f803fde850e0c5753 (patch)
tree41670ff93a8441ce155ba99cbfb684e5c52df4e7 /include/linux/regulator/machine.h
parent492c826b9facefa84995f4dea917e301b5ee0884 (diff)
downloadlinux-bf5892a8167e4aa5a9a6d72f803fde850e0c5753.tar.xz
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>
Diffstat (limited to 'include/linux/regulator/machine.h')
-rw-r--r--include/linux/regulator/machine.h4
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;