regulator: Add over current protection (OCP) support
Some regulators can automatically shut down when they detect an
over current event. Add an op (set_over_current_protection) and a
DT property + constraint to support this capability.
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/Documentation/devicetree/bindings/regulator/regulator.txt b/Documentation/devicetree/bindings/regulator/regulator.txt
index db88feb..24bd422 100644
--- a/Documentation/devicetree/bindings/regulator/regulator.txt
+++ b/Documentation/devicetree/bindings/regulator/regulator.txt
@@ -42,6 +42,7 @@
- regulator-system-load: Load in uA present on regulator that is not captured by
any consumer request.
- regulator-pull-down: Enable pull down resistor when the regulator is disabled.
+- regulator-over-current-protection: Enable over current protection.
Deprecated properties:
- regulator-compatible: If a regulator chip contains multiple
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index c9f7201..520413e 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1081,6 +1081,15 @@
}
}
+ if (rdev->constraints->over_current_protection
+ && ops->set_over_current_protection) {
+ ret = ops->set_over_current_protection(rdev);
+ if (ret < 0) {
+ rdev_err(rdev, "failed to set over current protection\n");
+ goto out;
+ }
+ }
+
print_constraints(rdev);
return 0;
out:
diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
index b1c485b..250700c 100644
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c
@@ -107,6 +107,9 @@
if (!of_property_read_u32(np, "regulator-system-load", &pval))
constraints->system_load = pval;
+ constraints->over_current_protection = of_property_read_bool(np,
+ "regulator-over-current-protection");
+
for (i = 0; i < ARRAY_SIZE(regulator_states); i++) {
switch (i) {
case PM_SUSPEND_MEM:
diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index 4db9fbe..4593222 100644
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -148,6 +148,7 @@
int (*get_current_limit) (struct regulator_dev *);
int (*set_input_current_limit) (struct regulator_dev *, int lim_uA);
+ int (*set_over_current_protection) (struct regulator_dev *);
/* enable/disable regulator */
int (*enable) (struct regulator_dev *);
diff --git a/include/linux/regulator/machine.h b/include/linux/regulator/machine.h
index b11be12..a1067d0 100644
--- a/include/linux/regulator/machine.h
+++ b/include/linux/regulator/machine.h
@@ -147,6 +147,7 @@
unsigned ramp_disable:1; /* disable ramp delay */
unsigned soft_start:1; /* ramp voltage slowly */
unsigned pull_down:1; /* pull down resistor when regulator off */
+ unsigned over_current_protection:1; /* auto disable on over current */
};
/**