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regulator: Add over current protection (OCP) support

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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>
This commit is contained in:
Stephen Boyd 2015-07-17 14:41:54 -07:00 committed by Mark Brown
parent bc0195aad0
commit 3a003baeec
5 changed files with 15 additions and 0 deletions
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1
Documentation/devicetree/bindings/regulator/regulator.txt
View File

@ -42,6 +42,7 @@ Optional properties:
- 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

9
drivers/regulator/core.c
View File

@ -1081,6 +1081,15 @@ static int set_machine_constraints(struct regulator_dev *rdev,
}
}
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:

3
drivers/regulator/of_regulator.c
View File

@ -107,6 +107,9 @@ static void of_get_regulation_constraints(struct device_node *np,
if (!of_property_read_u32(np, "regulator-system-load", &pval))
constraints->system_load = pval;
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:

1
include/linux/regulator/driver.h
View File

@ -148,6 +148,7 @@ struct regulator_ops {
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 *);

1
include/linux/regulator/machine.h
View File

@ -147,6 +147,7 @@ struct regulation_constraints {
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 */
};
/**