Commit 0da0e316 authored by Thierry Reding's avatar Thierry Reding
Browse files

of: reserved-memory: Support lookup of regions by name 



Add support for looking up memory regions by name. This looks up the
given name in the newly introduced memory-region-names property and
returns the memory region at the corresponding index in the memory-
region(s) property.

Reviewed-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 8f3d9f35

drivers/of/of_reserved_mem.c

+19 −0
Original line number Diff line number Diff line
@@ -357,6 +357,25 @@ int of_reserved_mem_device_init_by_idx(struct device *dev, 
}

EXPORT_SYMBOL_GPL(of_reserved_mem_device_init_by_idx);



/**

 * of_reserved_mem_device_init_by_name() - assign named reserved memory region

 *					   to given device

 * @dev: pointer to the device to configure

 * @np: pointer to the device node with 'memory-region' property

 * @name: name of the selected memory region

 *

 * Returns: 0 on success or a negative error-code on failure.

 */

int of_reserved_mem_device_init_by_name(struct device *dev,

					struct device_node *np,

					const char *name)

{

	int idx = of_property_match_string(np, "memory-region-names", name);



	return of_reserved_mem_device_init_by_idx(dev, np, idx);

}

EXPORT_SYMBOL_GPL(of_reserved_mem_device_init_by_name);



/**

 * of_reserved_mem_device_release() - release reserved memory device structures

 * @dev:	Pointer to the device to deconfigure

include/linux/of_reserved_mem.h

+11 −0
Original line number Diff line number Diff line
@@ -33,6 +33,9 @@ typedef int (*reservedmem_of_init_fn)(struct reserved_mem *rmem); 


int of_reserved_mem_device_init_by_idx(struct device *dev,

				       struct device_node *np, int idx);

int of_reserved_mem_device_init_by_name(struct device *dev,

					struct device_node *np,

					const char *name);

void of_reserved_mem_device_release(struct device *dev);



void fdt_init_reserved_mem(void);
@@ -45,6 +48,14 @@ static inline int of_reserved_mem_device_init_by_idx(struct device *dev, 
{

	return -ENOSYS;

}



static inline int of_reserved_mem_device_init_by_name(struct device *dev,

						      struct device_node *np,

						      const char *name)

{

	return -ENOSYS;

}



static inline void of_reserved_mem_device_release(struct device *pdev) { }



static inline void fdt_init_reserved_mem(void) { }

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