Add a function to retrieve the highest phandle in a given device tree.
Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
---
libfdt/fdt_ro.c | 15 +++++++++++++++
libfdt/libfdt.h | 13 +++++++++++++
2 files changed, 28 insertions(+)
diff --git a/libfdt/fdt_ro.c b/libfdt/fdt_ro.c
index 50cce864283c..d5a14178190f 100644
--- a/libfdt/fdt_ro.c
+++ b/libfdt/fdt_ro.c
@@ -88,6 +88,21 @@ static int _fdt_string_eq(const void *fdt, int stroffset,
return (strlen(p) == len) && (memcmp(p, s, len) == 0);
}
+uint32_t fdt_get_max_phandle(const void *fdt)
+{
+ uint32_t max_phandle = 0, phandle;
+ int offset;
+
+ for (offset = fdt_next_node(fdt, -1, NULL); offset >= 0;
+ offset = fdt_next_node(fdt, offset, NULL)) {
+ phandle = fdt_get_phandle(fdt, offset);
+ if (phandle > max_phandle)
+ max_phandle = phandle;
+ }
+
+ return max_phandle;
+}
+
int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size)
{
FDT_CHECK_HEADER(fdt);
diff --git a/libfdt/libfdt.h b/libfdt/libfdt.h
index 6589e08db7ab..7156b264b1e9 100644
--- a/libfdt/libfdt.h
+++ b/libfdt/libfdt.h
@@ -284,6 +284,19 @@ int fdt_move(const void *fdt, void *buf, int bufsize);
const char *fdt_string(const void *fdt, int stroffset);
/**
+ * fdt_get_max_phandle - retrieves the highest phandle in a tree
+ * @fdt: pointer to the device tree blob
+ *
+ * fdt_get_max_phandle retrieves the highest phandlle in the given
+ * device tree
+ *
+ * returns:
+ * the highest phandle on success
+ * 0, if an error occured
+ */
+uint32_t fdt_get_max_phandle(const void *fdt);
+
+/**
* fdt_num_mem_rsv - retrieve the number of memory reserve map entries
* @fdt: pointer to the device tree blob
*
--
2.8.2
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