diff options
| author | Maxime Ripard <maxime.ripard@free-electrons.com> | 2016-07-27 14:55:55 +0200 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-07-19 07:01:09 +0200 |
| commit | 220cde86efc161e342727106125510a0433c492a (patch) | |
| tree | cfce09c53e6e309e6d16db4ba4c632dfd3cbed80 /cpukit/dtc/libfdt | |
| parent | libfdt: Add iterator over properties (diff) | |
| download | rtems-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')
| -rw-r--r-- | cpukit/dtc/libfdt/fdt_ro.c | 26 |
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); |