PM / Domains: Add new helper functions for device-tree
Ideally, if we are returning a reference to a PM domain via a call to
of_genpd_get_from_provider(), then we should keep track of such
references via a reference count. The reference count could then be used
to determine if a PM domain can be safely removed. Alternatively, it is
possible to avoid such external references by providing APIs to access
the PM domain and hence, eliminate any calls to
of_genpd_get_from_provider().
Add new helper functions for adding a device and a subdomain to a PM
domain when using device-tree, so that external calls to
of_genpd_get_from_provider() can be removed.
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 31fec85..e1964a2 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -208,6 +208,10 @@
struct generic_pm_domain *__of_genpd_xlate_onecell(
struct of_phandle_args *genpdspec,
void *data);
+extern int of_genpd_add_device(struct of_phandle_args *args,
+ struct device *dev);
+extern int of_genpd_add_subdomain(struct of_phandle_args *parent,
+ struct of_phandle_args *new_subdomain);
int genpd_dev_pm_attach(struct device *dev);
#else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
@@ -227,6 +231,18 @@
#define __of_genpd_xlate_simple NULL
#define __of_genpd_xlate_onecell NULL
+static inline int of_genpd_add_device(struct of_phandle_args *args,
+ struct device *dev)
+{
+ return -ENODEV;
+}
+
+static inline int of_genpd_add_subdomain(struct of_phandle_args *parent,
+ struct of_phandle_args *new_subdomain)
+{
+ return -ENODEV;
+}
+
static inline int genpd_dev_pm_attach(struct device *dev)
{
return -ENODEV;