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ofnode: add {ofnode, dev}_read_resource_byname()

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Linux supports platform_get_resource_byname() to look up a resource
by name.

We want a similar helper.  It is useful when a device node has named
register regions.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Masahiro Yamada 2017-08-26 01:12:30 +09:00
parent 8b3cec7da1
commit 7b8b47bd29
4 changed files with 39 additions and 1 deletions
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12
drivers/core/ofnode.c
View file

@ -627,3 +627,15 @@ int ofnode_read_resource(ofnode node, uint index, struct resource *res)
return 0;
}
}
int ofnode_read_resource_byname(ofnode node, const char *name,
struct resource *res)
{
int index;
index = ofnode_stringlist_search(node, "reg-names", name);
if (index < 0)
return index;
return ofnode_read_resource(node, index, res);
}

6
drivers/core/read.c
View file

@ -164,3 +164,9 @@ int dev_read_resource(struct udevice *dev, uint index, struct resource *res)
{
return ofnode_read_resource(dev_ofnode(dev), index, res);
}
int dev_read_resource_byname(struct udevice *dev, const char *name,
struct resource *res)
{
return ofnode_read_resource_byname(dev_ofnode(dev), name, res);
}

2
include/dm/ofnode.h
View file

@ -625,5 +625,7 @@ int ofnode_read_simple_size_cells(ofnode node);
bool ofnode_pre_reloc(ofnode node);
int ofnode_read_resource(ofnode node, uint index, struct resource *res);
int ofnode_read_resource_byname(ofnode node, const char *name,
struct resource *res);
#endif

20
include/dm/read.h
View file

@ -359,13 +359,24 @@ int dev_read_enabled(struct udevice *dev);
/**
* dev_read_resource() - obtain an indexed resource from a device.
*
* @dev: devuce to examine
* @dev: device to examine
* @index index of the resource to retrieve (0 = first)
* @res returns the resource
* @return 0 if ok, negative on error
*/
int dev_read_resource(struct udevice *dev, uint index, struct resource *res);
/**
* dev_read_resource_byname() - obtain a named resource from a device.
*
* @dev: device to examine
* @name: name of the resource to retrieve
* @res: returns the resource
* @return 0 if ok, negative on error
*/
int dev_read_resource_byname(struct udevice *dev, const char *name,
struct resource *res);
#else /* CONFIG_DM_DEV_READ_INLINE is enabled */
static inline int dev_read_u32_default(struct udevice *dev,
@ -513,6 +524,13 @@ static inline int dev_read_resource(struct udevice *dev, uint index,
return ofnode_read_resource(dev_ofnode(dev), index, res);
}
static inline int dev_read_resource_byname(struct udevice *dev,
const char *name,
struct resource *res)
{
return ofnode_read_resource_byname(dev_ofnode(dev), name, res);
}
#endif /* CONFIG_DM_DEV_READ_INLINE */
/**