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

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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 <[email protected]>
Signed-off-by: Shannon Zhao <[email protected]>
Acked-by: Stefano Stabellini <[email protected]>
Acked-by: Rob Herring <[email protected]>
Tested-by: Julien Grall <[email protected]>
This commit is contained in:
Shannon Zhao 2016-04-07 20:03:33 +08:00 • committed by David Vrabel
commit 9c6098685a
2 changed files with 15 additions and 0 deletions
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13
drivers/of/fdt.c
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@ -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
*/