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authorMaxime Ripard <maxime.ripard@free-electrons.com>2016-07-27 14:55:55 +0200
committerSebastian Huber <sebastian.huber@embedded-brains.de>2018-07-19 07:01:09 +0200
commit220cde86efc161e342727106125510a0433c492a (patch)
treecfce09c53e6e309e6d16db4ba4c632dfd3cbed80 /cpukit/dtc/libfdt/fdt_ro.c
parentlibfdt: Add iterator over properties (diff)
downloadrtems-220cde86efc161e342727106125510a0433c492a.tar.bz2
libfdt: Add max phandle retrieval function
Add a function to retrieve the highest phandle in a given device tree. Acked-by: Simon Glass <sjg@chromium.org> Reviewed-by: Stefan Agner <stefan@agner.ch> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'cpukit/dtc/libfdt/fdt_ro.c')
-rw-r--r--cpukit/dtc/libfdt/fdt_ro.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/cpukit/dtc/libfdt/fdt_ro.c b/cpukit/dtc/libfdt/fdt_ro.c
index 50cce86428..04590984bd 100644
--- a/cpukit/dtc/libfdt/fdt_ro.c
+++ b/cpukit/dtc/libfdt/fdt_ro.c
@@ -88,6 +88,32 @@ 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;
+ 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 (uint32_t)-1;
+
+ phandle = fdt_get_phandle(fdt, offset);
+ if (phandle == (uint32_t)-1)
+ continue;
+
+ 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);