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

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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: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2020-04-03 19:44:52 +02:00
parent 8f3d9f3542
commit 0da0e31600
2 changed files with 30 additions and 0 deletions
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19
drivers/of/of_reserved_mem.c
View file

@ -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

11
include/linux/of_reserved_mem.h
View file

@ -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) { }