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Subject[RFC PATCH 3/4] PM / Domains: Add OF helpers for getting PM domains
Date
Add helper functions for getting PM domains via device-tree that are to
be controlled explicitly via the pm_genpd_poweron/off() APIs. PM domains
can be retrieved by either index or name. Retrieving a PM domain by name
requires that the 'power-domain-names' property is present for the
consumer.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
---
drivers/base/power/domain.c | 72 +++++++++++++++++++++++++++++++++++++++++++++
include/linux/pm_domain.h | 17 +++++++++++
2 files changed, 89 insertions(+)

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 4980ec157750..77516b2b3e58 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -2285,6 +2285,78 @@ int of_genpd_parse_idle_states(struct device_node *dn,
return 0;
}
EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states);
+
+static struct generic_pm_domain *genpd_get(struct device_node *np, int index)
+{
+ struct of_phandle_args genpdspec;
+ struct generic_pm_domain *genpd;
+ int ret;
+
+ if (index < 0)
+ return ERR_PTR(-EINVAL);
+
+ ret = of_parse_phandle_with_args(np, "power-domains",
+ "#power-domain-cells", index,
+ &genpdspec);
+ if (ret)
+ return ERR_PTR(ret);
+
+ mutex_lock(&gpd_list_lock);
+
+ genpd = genpd_get_from_provider(&genpdspec);
+ of_node_put(genpdspec.np);
+
+ if (!IS_ERR(genpd)) {
+ genpd_lock(genpd);
+ genpd->device_count++;
+ genpd->suspended_count++;
+ genpd_unlock(genpd);
+ }
+
+ mutex_unlock(&gpd_list_lock);
+
+ return genpd;
+}
+
+/**
+ * of_genpd_get() - Get a PM domain by index using a device node
+ * @np: pointer to PM domain consumer node
+ * @index: index reference for a PM domain in the consumer node
+ *
+ * This function parses the 'power-domains' property using the index
+ * provided to look up a PM domain from the registered list of PM domain
+ * providers.
+ */
+struct generic_pm_domain *of_genpd_get(struct device_node *np, int index)
+{
+ return genpd_get(np, index);
+}
+EXPORT_SYMBOL(of_genpd_get);
+
+/**
+ * of_genpd_get_by_name() - Get a PM domain by name using a device node
+ * @np: pointer to PM domain consumer node
+ * @name: name reference for a PM domain in the consumer node
+ *
+ * This function parses the 'power-domains' and 'power-domain-names'
+ * properties, and uses them to look up a PM domain from the registered
+ * list of PM domain providers.
+ */
+struct generic_pm_domain *of_genpd_get_by_name(struct device_node *np,
+ const char *name)
+{
+ int index;
+
+ if (!np || !name)
+ return ERR_PTR(-EINVAL);
+
+ index = of_property_match_string(np, "power-domain-names", name);
+ if (index < 0)
+ return ERR_PTR(index);
+
+ return genpd_get(np, index);
+}
+EXPORT_SYMBOL(of_genpd_get_by_name);
#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */


diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index b3aa1f237d96..d0183d96a1b3 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -240,6 +240,10 @@ extern int of_genpd_add_subdomain(struct of_phandle_args *parent,
extern struct generic_pm_domain *of_genpd_remove_last(struct device_node *np);
extern int of_genpd_parse_idle_states(struct device_node *dn,
struct genpd_power_state **states, int *n);
+extern struct generic_pm_domain *of_genpd_get(struct device_node *np,
+ int index);
+extern struct generic_pm_domain *of_genpd_get_by_name(struct device_node *np,
+ const char *name);

int genpd_dev_pm_attach(struct device *dev);
#else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
@@ -285,6 +289,19 @@ struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
{
return ERR_PTR(-ENOTSUPP);
}
+
+static inline
+struct generic_pm_domain *of_genpd_get(struct device_node *np, int index)
+{
+ return ERR_PTR(-ENOTSUPP);
+}
+
+static inline
+struct generic_pm_domain *of_genpd_get_by_name(struct device_node *np,
+ const char *name)
+{
+ return ERR_PTR(-ENOTSUPP);
+}
#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */

#ifdef CONFIG_PM
--
2.7.4
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