regulator: core: Parse coupled regulators properties
On Odroid XU3/4 and other Exynos5422 based boards there is a case, that
different devices on the board are supplied by different regulators
with non-fixed voltages. If one of these devices temporarily requires
higher voltage, there might occur a situation that the spread between
devices' voltages is so high, that there is a risk of changing
'high' and 'low' states on the interconnection between devices powered
by those regulators.
Add new structure "coupling_desc" to regulator_dev, which contains
pointers to all coupled regulators including the owner of the structure,
number of coupled regulators and counter of currently resolved
regulators.
Add of_functions to parse all data needed in regulator coupling.
Provide method to check DTS data consistency. Check if each coupled
regulator's max_spread is equal and if their lists of regulators match.
Signed-off-by: Maciej Purski <m.purski@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/include/linux/regulator/machine.h b/include/linux/regulator/machine.h
index 93a0489..3468703 100644
--- a/include/linux/regulator/machine.h
+++ b/include/linux/regulator/machine.h
@@ -103,6 +103,7 @@ struct regulator_state {
* @ilim_uA: Maximum input current.
* @system_load: Load that isn't captured by any consumer requests.
*
+ * @max_spread: Max possible spread between coupled regulators
* @valid_modes_mask: Mask of modes which may be configured by consumers.
* @valid_ops_mask: Operations which may be performed by consumers.
*
@@ -154,6 +155,9 @@ struct regulation_constraints {
int system_load;
+ /* used for coupled regulators */
+ int max_spread;
+
/* valid regulator operating modes for this machine */
unsigned int valid_modes_mask;