diff options
| author | Shannon Zhao <shannon.zhao@linaro.org> | 2016-04-07 20:03:33 +0800 |
|---|---|---|
| committer | David Vrabel <david.vrabel@citrix.com> | 2016-07-06 10:34:46 +0100 |
| commit | 9c6098685a1d5df72da61ff7838ebb1524796869 (patch) | |
| tree | 4e24b0c39329c6de73c6394387f3ec3e9af8adea | |
| parent | be1aaf4e4026118e4191117a48f8a8078d1c0ed4 (diff) | |
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>
| -rw-r--r-- | drivers/of/fdt.c | 13 | ||||
| -rw-r--r-- | include/linux/of_fdt.h | 2 |
2 files changed, 15 insertions, 0 deletions
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 33daffc4392c..0e02947a8a7a 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -744,6 +744,19 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node, } /** + * 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 */ unsigned long __init of_get_flat_dt_root(void) diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h index 901ec01c9fba..26c3302ae58f 100644 --- a/include/linux/of_fdt.h +++ b/include/linux/of_fdt.h @@ -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); |