fdt: Add function to alloc phandle values
If we are creating reference (handles) to nodes in a device tree we need
to first create a new phandle in node and this needs a new phandle
value. So we search through the whole dtb to find the max phandle value
and return the next greater value for a new phandle allocation.
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Gerald Van Baren <vanbaren@cideas.com>
diff --git a/common/fdt_support.c b/common/fdt_support.c
index 718b635..166f5e1 100644
--- a/common/fdt_support.c
+++ b/common/fdt_support.c
@@ -1151,4 +1151,22 @@
return -FDT_ERR_NOTFOUND;
}
+/**
+ * fdt_alloc_phandle: Return next free phandle value
+ *
+ * @blob: ptr to device tree
+ */
+int fdt_alloc_phandle(void *blob)
+{
+ int offset, len, phandle = 0;
+ const u32 *val;
+ for (offset = fdt_next_node(blob, -1, NULL); offset >= 0;
+ offset = fdt_next_node(blob, offset, NULL)) {
+ val = fdt_getprop(blob, offset, "linux,phandle", &len);
+ if (val)
+ phandle = max(*val, phandle);
+ }
+
+ return phandle + 1;
+}