From f4fcfdda2fd8834c62dcb9bfddcf1f89d190b70e Mon Sep 17 00:00:00 2001 From: "Rob Herring (Arm)" Date: Wed, 23 Apr 2025 14:42:13 -0500 Subject: of: reserved_mem: Add functions to parse "memory-region" Drivers with "memory-region" properties currently have to do their own parsing of "memory-region" properties. The result is all the drivers have similar patterns of a call to parse "memory-region" and then get the region's address and size. As this is a standard property, it should have common functions for drivers to use. Add new functions to count the number of regions and retrieve the region's address as a resource. Reviewed-by: Daniel Baluta Acked-by: Arnaud Pouliquen Link: https://lore.kernel.org/r/20250423-dt-memory-region-v2-v2-1-2fbd6ebd3c88@kernel.org Signed-off-by: Rob Herring (Arm) --- include/linux/of_reserved_mem.h | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) (limited to 'include/linux') diff --git a/include/linux/of_reserved_mem.h b/include/linux/of_reserved_mem.h index e338282da652..f573423359f4 100644 --- a/include/linux/of_reserved_mem.h +++ b/include/linux/of_reserved_mem.h @@ -7,6 +7,7 @@ struct of_phandle_args; struct reserved_mem_ops; +struct resource; struct reserved_mem { const char *name; @@ -39,6 +40,12 @@ int of_reserved_mem_device_init_by_name(struct device *dev, void of_reserved_mem_device_release(struct device *dev); struct reserved_mem *of_reserved_mem_lookup(struct device_node *np); +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, + const char *name, struct resource *res); +int of_reserved_mem_region_count(const struct device_node *np); + #else #define RESERVEDMEM_OF_DECLARE(name, compat, init) \ @@ -63,6 +70,25 @@ static inline struct reserved_mem *of_reserved_mem_lookup(struct device_node *np { return NULL; } + +static inline int of_reserved_mem_region_to_resource(const struct device_node *np, + unsigned int idx, + struct resource *res) +{ + return -ENOSYS; +} + +static inline int of_reserved_mem_region_to_resource_byname(const struct device_node *np, + const char *name, + struct resource *res) +{ + return -ENOSYS; +} + +static inline int of_reserved_mem_region_count(const struct device_node *np) +{ + return 0; +} #endif /** -- cgit v1.2.3