diff options
author | Maxime Ripard <maxime.ripard@free-electrons.com> | 2016-07-05 08:26:39 (GMT) |
---|---|---|
committer | Tom Rini <trini@konsulko.com> | 2016-08-20 15:35:01 (GMT) |
commit | 57c7809ab0452bb9dc29c383fe64b651c911e1d2 (patch) | |
tree | 15dad694f7902a38ac4f1f8fd979acece6f58e86 | |
parent | 67e610d9f0e9262cfa742f8a78c089b3cab9659a (diff) | |
download | u-boot-57c7809ab0452bb9dc29c383fe64b651c911e1d2.tar.xz |
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.h | 13 | ||||
-rw-r--r-- | lib/libfdt/fdt_ro.c | 26 |
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); |