[PATCH 3/4] libfdt: Add max phandle retrieval function
From: Maxime Ripard <hidden>
Date: 2016-05-27 08:28:48
Subsystem:
the rest · Maintainer:
Linus Torvalds
Possibly related (same subject, not in this thread)
- 2016-05-31 · Re: [PATCH 3/4] libfdt: Add max phandle retrieval function · David Gibson <hidden>
Add a function to retrieve the highest phandle in a given device tree. Signed-off-by: Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org> --- 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 *
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2.8.2