This adds of_reserved_mem_lookup_by_name() helper to get a reserved-memory region based on the DT node name.
Signed-off-by: Viresh Kumar viresh.kumar@linaro.org --- drivers/of/of_reserved_mem.c | 27 +++++++++++++++++++++++++++ include/linux/of_reserved_mem.h | 6 ++++++ 2 files changed, 33 insertions(+)
diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c index e0a86c3fa656..b94c3b1d14b6 100644 --- a/drivers/of/of_reserved_mem.c +++ b/drivers/of/of_reserved_mem.c @@ -758,6 +758,33 @@ struct reserved_mem *of_reserved_mem_lookup(struct device_node *np) } EXPORT_SYMBOL_GPL(of_reserved_mem_lookup);
+/** + * of_reserved_mem_lookup_by_name() - acquire reserved_mem from node name + * @name: node name + * + * This function allows drivers to acquire a reference to the reserved_mem + * struct based on a reserved-memory node name. + * + * Returns a reserved_mem reference, or NULL on error. + */ +struct reserved_mem *of_reserved_mem_lookup_by_name(const char *name) +{ + struct device_node *np __free(device_node) = + of_find_node_by_path("/reserved-memory"); + struct device_node *child __free(device_node) = NULL; + + if (!np) + return ERR_PTR(-ENODEV); + + for_each_child_of_node(np, child) { + if (of_node_name_eq(child, name)) + return of_reserved_mem_lookup(child); + } + + return ERR_PTR(-ENODEV); +} +EXPORT_SYMBOL_GPL(of_reserved_mem_lookup_by_name); + /** * of_reserved_mem_region_to_resource() - Get a reserved memory region as a resource * @np: node containing 'memory-region' property diff --git a/include/linux/of_reserved_mem.h b/include/linux/of_reserved_mem.h index 3933f1d39e9a..d6d187597b7f 100644 --- a/include/linux/of_reserved_mem.h +++ b/include/linux/of_reserved_mem.h @@ -41,6 +41,7 @@ int reserved_mem_device_init(struct device *dev, struct reserved_mem *rmem); void of_reserved_mem_device_release(struct device *dev);
struct reserved_mem *of_reserved_mem_lookup(struct device_node *np); +struct reserved_mem *of_reserved_mem_lookup_by_name(const char *name); int of_reserved_mem_region_to_resource(const struct device_node *np, unsigned int idx, struct resource *res); int of_reserved_mem_region_to_resource_byname(const struct device_node *np, @@ -78,6 +79,11 @@ static inline struct reserved_mem *of_reserved_mem_lookup(struct device_node *np return NULL; }
+static inline struct reserved_mem *of_reserved_mem_lookup_by_name(const char *name) +{ + return NULL; +} + static inline int of_reserved_mem_region_to_resource(const struct device_node *np, unsigned int idx, struct resource *res)