The allows the OPP core to request/free the regulator resource, attached to a device OPP. The regulator device is fetched using device node and name of the device.
For example, a cpu0 device node needs to look like this: cpu0: cpu@900 { device_type = "cpu"; compatible = "arm,cortex-a9"; reg = <0x900>; cpu0-supply = <&varm>; ... };
This will work for both OPP-v1 and v2 bindings.
This is a preliminary step in moving the OPP switching logic into the OPP core.
Signed-off-by: Viresh Kumar viresh.kumar@linaro.org --- drivers/base/power/opp/core.c | 8 ++++++++ drivers/base/power/opp/opp.h | 4 ++++ 2 files changed, 12 insertions(+)
diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c index cd230c63aee6..2e49f5e9daa3 100644 --- a/drivers/base/power/opp/core.c +++ b/drivers/base/power/opp/core.c @@ -505,6 +505,7 @@ static struct device_opp *_add_device_opp(struct device *dev) { struct device_opp *dev_opp; struct device_list_opp *list_dev; + const char *name = dev_name(dev);
/* Check for existing list for 'dev' first */ dev_opp = _find_device_opp(dev); @@ -527,6 +528,11 @@ static struct device_opp *_add_device_opp(struct device *dev) return NULL; }
+ dev_opp->regulator = regulator_get_optional(dev, name); + if (IS_ERR(dev_opp->regulator)) + dev_info(dev, "%s: no regulator (%s) found: %ld\n", __func__, + name, PTR_ERR(dev_opp->regulator)); + srcu_init_notifier_head(&dev_opp->srcu_head); INIT_LIST_HEAD(&dev_opp->opp_list);
@@ -565,6 +571,8 @@ static void _remove_device_opp(struct device_opp *dev_opp) if (dev_opp->prop_name) return;
+ regulator_put(dev_opp->regulator); + list_dev = list_first_entry(&dev_opp->dev_list, struct device_list_opp, node);
diff --git a/drivers/base/power/opp/opp.h b/drivers/base/power/opp/opp.h index 690638ef36ee..c4a03ad34100 100644 --- a/drivers/base/power/opp/opp.h +++ b/drivers/base/power/opp/opp.h @@ -18,6 +18,7 @@ #include <linux/kernel.h> #include <linux/list.h> #include <linux/limits.h> +#include <linux/regulator/consumer.h> #include <linux/pm_opp.h> #include <linux/rculist.h> #include <linux/rcupdate.h> @@ -132,6 +133,8 @@ struct device_list_opp { * @supported_hw: Array of version number to support. * @supported_hw_count: Number of elements in supported_hw array. * @prop_name: A name to postfix to many DT properties, while parsing them. + * @regulator: Supply Regulator + * * @dentry: debugfs dentry pointer of the real device directory (not links). * @dentry_name: Name of the real dentry. * @@ -159,6 +162,7 @@ struct device_opp { unsigned int *supported_hw; unsigned int supported_hw_count; const char *prop_name; + struct regulator *regulator;
#ifdef CONFIG_DEBUG_FS struct dentry *dentry;