diff options
Diffstat (limited to 'drivers/of/fdt.c')
| -rw-r--r-- | drivers/of/fdt.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index a0972219ccfc..43bd69dceabf 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -507,6 +507,9 @@ void *__unflatten_device_tree(const void *blob, /* Allocate memory for the expanded device tree */ mem = dt_alloc(size + 4, __alignof__(struct device_node)); + if (!mem) + return NULL; + memset(mem, 0, size); *(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef); @@ -756,6 +759,36 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node, } /** + * of_scan_flat_dt_subnodes - scan sub-nodes of a node call callback on each. + * @it: callback function + * @data: context data pointer + * + * This function is used to scan sub-nodes of a node. + */ +int __init of_scan_flat_dt_subnodes(unsigned long parent, + int (*it)(unsigned long node, + const char *uname, + void *data), + void *data) +{ + const void *blob = initial_boot_params; + int node; + + fdt_for_each_subnode(node, blob, parent) { + const char *pathp; + int rc; + + pathp = fdt_get_name(blob, node, NULL); + if (*pathp == '/') + pathp = kbasename(pathp); + rc = it(node, pathp, data); + if (rc) + return rc; + } + return 0; +} + +/** * of_get_flat_dt_subnode_by_name - get the subnode by given name * * @node: the parent node @@ -814,6 +847,14 @@ int __init of_flat_dt_match(unsigned long node, const char *const *compat) return of_fdt_match(initial_boot_params, node, compat); } +/** + * of_get_flat_dt_prop - Given a node in the flat blob, return the phandle + */ +uint32_t __init of_get_flat_dt_phandle(unsigned long node) +{ + return fdt_get_phandle(initial_boot_params, node); +} + struct fdt_scan_status { const char *name; int namelen; |