[PATCH v2 2/6] regulator: Add system_load constraint

Stephen Boyd
2015-06-12T00:31:26Z

Some regulators have a fixed load that isn't captured by
consumers that the kernel knows about. Add a constraint to
support this.

Cc: <devicetree@vger.kernel.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---
Documentation/devicetree/bindings/regulator/regulator.txt | 2 ++
drivers/regulator/core.c | 2 ++
drivers/regulator/of_regulator.c | 3 +++
include/linux/regulator/machine.h | 3 +++
4 files changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/regulator/regulator.txt b/Documentation/devicetree/bindings/regulator/regulator.txt
index abb26b58c83e..553d2d0fe6d9 100644
--- a/Documentation/devicetree/bindings/regulator/regulator.txt
+++ b/Documentation/devicetree/bindings/regulator/regulator.txt
@@ -37,6 +37,8 @@ Optional properties:
- regulator-initial-mode: initial operating mode. The set of possible operating
modes depends on the capabilities of every hardware so each device binding
documentation explains which values the regulator supports.
+- regulator-system-load: Load in uA present on regulator that is not captured by
+ any consumer request.

Deprecated properties:
- regulator-compatible: If a regulator chip contains multiple
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 9dba0a3d4526..ab383dfe5386 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -678,6 +678,8 @@ static int drms_uA_update(struct regulator_dev *rdev)
list_for_each_entry(sibling, &rdev->consumer_list, list)
current_uA += sibling->uA_load;

+ current_uA += rdev->constraints->system_load;
+
if (rdev->desc->ops->set_load) {
/* set the optimum mode for our new total regulator load */
err = rdev->desc->ops->set_load(rdev, current_uA);
diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
index 856c17d69b7e..b44da860ac22 100644
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c
@@ -95,6 +95,9 @@ static void of_get_regulation_constraints(struct device_node *np,
}
}

+ if (!of_property_read_u32(np, "regulator-system-load", &pval))
+ constraints->system_load = pval;
+
for (i = 0; i < ARRAY_SIZE(regulator_states); i++) {
switch (i) {
case PM_SUSPEND_MEM:
diff --git a/include/linux/regulator/machine.h b/include/linux/regulator/machine.h
index b07562e082c4..01526559c8c3 100644
--- a/include/linux/regulator/machine.h
+++ b/include/linux/regulator/machine.h
@@ -75,6 +75,7 @@ struct regulator_state {
*
* @min_uA: Smallest current consumers may set.
* @max_uA: Largest current consumers may set.
+ * @system_load: Load that isn't captured by any consumer requests.
*
* @valid_modes_mask: Mask of modes which may be configured by consumers.
* @valid_ops_mask: Operations which may be performed by consumers.
@@ -112,6 +113,8 @@ struct regulation_constraints {
int min_uA;
int max_uA;

+ int system_load;
+
/* valid regulator operating modes for this machine */
unsigned int valid_modes_mask;