The genpd framework allows users to add power-domains via the
pm_genpd_init() function, however, there is no corresponding function
to remove a power-domain. For most devices this may be fine as the power
domains are never removed, however, for devices that wish to populate
the power-domains from within a driver, having the ability to remove a
power domain if the probing of the device fails or the driver is unloaded
is necessary. Therefore, add a function to remove a power-domain. Please
note that the power domain can only be removed if there are no devices
using the power-domain and it is not linked to another domain.
Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx>
---
drivers/base/power/domain.c | 31 +++++++++++++++++++++++++++++++
include/linux/pm_domain.h | 5 +++++
2 files changed, 36 insertions(+)
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 608bc00655ee..22f6e9d738bf 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -1557,6 +1557,37 @@ void pm_genpd_init(struct generic_pm_domain *genpd,
}
EXPORT_SYMBOL_GPL(pm_genpd_init);
+/**
+ * pm_genpd_remove - Remove a generic I/O PM domain object.
+ * @genpd: PM domain object to remove.
+ */
+int pm_genpd_remove(struct generic_pm_domain *genpd)
+{
+ int ret = 0;
+
+ if (IS_ERR_OR_NULL(genpd))
+ return -EINVAL;
+
+ mutex_lock(&gpd_list_lock);
+ mutex_lock(&genpd->lock);
+
+ if (!list_empty(&genpd->master_links)
+ || !list_empty(&genpd->slave_links) || genpd->device_count) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ cancel_work_sync(&genpd->power_off_work);
+ list_del(&genpd->gpd_list_node);
+
+out:
+ mutex_unlock(&genpd->lock);
+ mutex_unlock(&gpd_list_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(pm_genpd_remove);
+
#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
/*
* Device Tree based PM domain providers.
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index b38dd74dea9b..9ae9c42f807f 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -134,6 +134,7 @@ extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
struct generic_pm_domain *target);
extern void pm_genpd_init(struct generic_pm_domain *genpd,
struct dev_power_governor *gov, bool is_off);
+extern int pm_genpd_remove(struct generic_pm_domain *genpd);
extern struct dev_power_governor simple_qos_governor;
extern struct dev_power_governor pm_domain_always_on_gov;
@@ -177,6 +178,10 @@ static inline void pm_genpd_init(struct generic_pm_domain *genpd,
struct dev_power_governor *gov, bool is_off)
{
}
+static inline int pm_genpd_remove(struct generic_pm_domain *genpd)
+{
+ return -ENOTSUPP;
+}
#endif
static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
--
2.1.4
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