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-rw-r--r--drivers/of/fdt.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index f41d739aa2f..b17a9086cbf 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -99,3 +99,46 @@ unsigned long __init of_get_flat_dt_root(void)
return _ALIGN(p + strlen((char *)p) + 1, 4);
}
+/**
+ * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr
+ *
+ * This function can be used within scan_flattened_dt callback to get
+ * access to properties
+ */
+void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
+ unsigned long *size)
+{
+ unsigned long p = node;
+
+ do {
+ u32 tag = *((u32 *)p);
+ u32 sz, noff;
+ const char *nstr;
+
+ p += 4;
+ if (tag == OF_DT_NOP)
+ continue;
+ if (tag != OF_DT_PROP)
+ return NULL;
+
+ sz = *((u32 *)p);
+ noff = *((u32 *)(p + 4));
+ p += 8;
+ if (initial_boot_params->version < 0x10)
+ p = _ALIGN(p, sz >= 8 ? 8 : 4);
+
+ nstr = find_flat_dt_string(noff);
+ if (nstr == NULL) {
+ pr_warning("Can't find property index name !\n");
+ return NULL;
+ }
+ if (strcmp(name, nstr) == 0) {
+ if (size)
+ *size = sz;
+ return (void *)p;
+ }
+ p += sz;
+ p = _ALIGN(p, 4);
+ } while (1);
+}
+