From 220cde86efc161e342727106125510a0433c492a Mon Sep 17 00:00:00 2001 From: Maxime Ripard Date: Wed, 27 Jul 2016 14:55:55 +0200 Subject: libfdt: Add max phandle retrieval function Add a function to retrieve the highest phandle in a given device tree. Acked-by: Simon Glass Reviewed-by: Stefan Agner Reviewed-by: David Gibson Signed-off-by: Maxime Ripard Signed-off-by: David Gibson --- cpukit/dtc/libfdt/fdt_ro.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) (limited to 'cpukit/dtc') 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); -- cgit v1.2.3