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authorMaxime Ripard <maxime.ripard@free-electrons.com>2016-07-05 10:26:39 +0200
committerTom Rini <trini@konsulko.com>2016-08-20 11:35:01 -0400
commit57c7809ab0452bb9dc29c383fe64b651c911e1d2 (patch)
tree15dad694f7902a38ac4f1f8fd979acece6f58e86
parent67e610d9f0e9262cfa742f8a78c089b3cab9659a (diff)
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libfdt: Add max phandle retrieval function
Add a function to retrieve the highest phandle in a given device tree. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Reviewed-by: Stefan Agner <stefan@agner.ch> Acked-by: Simon Glass <sjg@chromium.org>
-rw-r--r--include/libfdt.h13
-rw-r--r--lib/libfdt/fdt_ro.c26
2 files changed, 39 insertions, 0 deletions
diff --git a/include/libfdt.h b/include/libfdt.h
index fbbe58c..4643be5 100644
--- a/include/libfdt.h
+++ b/include/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 phandle in the given
+ * device tree
+ *
+ * returns:
+ * the highest phandle on success
+ * 0, if an error occurred
+ */
+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
*
diff --git a/lib/libfdt/fdt_ro.c b/lib/libfdt/fdt_ro.c
index 12214c2..503150e 100644
--- a/lib/libfdt/fdt_ro.c
+++ b/lib/libfdt/fdt_ro.c
@@ -47,6 +47,32 @@ static int _fdt_string_eq(const void *fdt, int stroffset,
return (strnlen(p, len + 1) == len) && (memcmp(p, s, len) == 0);
}
+uint32_t fdt_get_max_phandle(const void *fdt)
+{
+ uint32_t max_phandle = 0;
+ int offset;
+
+ for (offset = fdt_next_node(fdt, -1, NULL);;
+ offset = fdt_next_node(fdt, offset, NULL)) {
+ uint32_t phandle;
+
+ if (offset == -FDT_ERR_NOTFOUND)
+ return max_phandle;
+
+ if (offset < 0)
+ return 0;
+
+ phandle = fdt_get_phandle(fdt, offset);
+ if (phandle == (uint32_t)-1)
+ return 0;
+
+ if (phandle > max_phandle)
+ max_phandle = phandle;
+ }
+
+ return 0;
+}
+
int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size)
{
FDT_CHECK_HEADER(fdt);