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FDT: Add a helper to get the subnode by given name 

Sometimes it needs to check if there is a subnode of given node in FDT
by given name. Introduce this helper to get the subnode if it exists.

CC: Rob Herring <robh@kernel.org>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Rob Herring <robh@kernel.org>
Tested-by: Julien Grall <julien.grall@arm.com>
This commit is contained in:
Shannon Zhao 2016-04-07 20:03:33 +08:00 committed by David Vrabel
parent be1aaf4e40
commit 9c6098685a
2 changed files with 15 additions and 0 deletions
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13
drivers/of/fdt.c
View File

@ -743,6 +743,19 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node,
return rc;
}
/**
* of_get_flat_dt_subnode_by_name - get the subnode by given name
*
* @node: the parent node
* @uname: the name of subnode
* @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none
*/
int of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname)
{
return fdt_subnode_offset(initial_boot_params, node, uname);
}
/**
* of_get_flat_dt_root - find the root node in the flat blob
*/

2
include/linux/of_fdt.h
View File

@ -53,6 +53,8 @@ extern char __dtb_end[];
extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,
int depth, void *data),
void *data);
extern int of_get_flat_dt_subnode_by_name(unsigned long node,
const char *uname);
extern const void *of_get_flat_dt_prop(unsigned long node, const char *name,
int *size);
extern int of_flat_dt_is_compatible(unsigned long node, const char *name);