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authorJon Hunter <jonathanh@nvidia.com>2016-09-12 12:01:05 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-09-13 02:49:32 +0200
commitec69572b3f0daf1f26b3e563d56e487d515a3cd1 (patch)
treed1b3de58420b6e37d3a59c134d41e6928b0592b0 /drivers/base
parent8b0510b52478a4ede8a7537da7faa66242bd0ae4 (diff)
downloadlinux-ec69572b3f0daf1f26b3e563d56e487d515a3cd1.tar.bz2
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>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/domain.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 058c8b6d2871..e12d3a8a29a9 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -1502,6 +1502,52 @@ struct generic_pm_domain *of_genpd_get_from_provider(
EXPORT_SYMBOL_GPL(of_genpd_get_from_provider);
/**
+ * of_genpd_add_device() - Add a device to an I/O PM domain
+ * @genpdspec: OF phandle args to use for look-up PM domain
+ * @dev: Device to be added.
+ *
+ * Looks-up an I/O PM domain based upon phandle args provided and adds
+ * the device to the PM domain. Returns a negative error code on failure.
+ */
+int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev)
+{
+ struct generic_pm_domain *genpd;
+
+ genpd = of_genpd_get_from_provider(genpdspec);
+ if (IS_ERR(genpd))
+ return PTR_ERR(genpd);
+
+ return pm_genpd_add_device(genpd, dev);
+}
+EXPORT_SYMBOL_GPL(of_genpd_add_device);
+
+/**
+ * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
+ * @parent_spec: OF phandle args to use for parent PM domain look-up
+ * @subdomain_spec: OF phandle args to use for subdomain look-up
+ *
+ * Looks-up a parent PM domain and subdomain based upon phandle args
+ * provided and adds the subdomain to the parent PM domain. Returns a
+ * negative error code on failure.
+ */
+int of_genpd_add_subdomain(struct of_phandle_args *parent_spec,
+ struct of_phandle_args *subdomain_spec)
+{
+ struct generic_pm_domain *parent, *subdomain;
+
+ parent = of_genpd_get_from_provider(parent_spec);
+ if (IS_ERR(parent))
+ return PTR_ERR(parent);
+
+ subdomain = of_genpd_get_from_provider(subdomain_spec);
+ if (IS_ERR(subdomain))
+ return PTR_ERR(subdomain);
+
+ return pm_genpd_add_subdomain(parent, subdomain);
+}
+EXPORT_SYMBOL_GPL(of_genpd_add_subdomain);
+
+/**
* genpd_dev_pm_detach - Detach a device from its PM domain.
* @dev: Device to detach.
* @power_off: Currently not used