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 <ga...@kernel.crashing.org>
---
common/fdt_support.c | 16 ++++++++++++++++
include/fdt_support.h | 1 +
2 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/common/fdt_support.c b/common/fdt_support.c
index 718b635..30c662a 100644
--- a/common/fdt_support.c
+++ b/common/fdt_support.c
@@ -1151,4 +1151,20 @@ int fdt_node_offset_by_compat_reg(void *blob, const char
*compat,
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;
+}
diff --git a/include/fdt_support.h b/include/fdt_support.h
index 54af9fe..871ef45 100644
--- a/include/fdt_support.h
+++ b/include/fdt_support.h
@@ -86,6 +86,7 @@ void fdt_del_node_and_alias(void *blob, const char *alias);
u64 fdt_translate_address(void *blob, int node_offset, const u32 *in_addr);
int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
phys_addr_t compat_off);
+int fdt_alloc_phandle(void *blob);
#endif /* ifdef CONFIG_OF_LIBFDT */
#endif /* ifndef __FDT_SUPPORT_H */
--
1.6.0.6
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