diff options
| author | Simon Glass <sjg@chromium.org> | 2011-11-29 16:27:17 -0800 |
|---|---|---|
| committer | Gerrit <chrome-bot@google.com> | 2011-11-30 13:01:47 -0800 |
| commit | e48f5d4d14f2e84593d262063b05797bc328dc83 (patch) | |
| tree | bd83fa56dd618e920c9d6164d9e9783cee754821 /common | |
| parent | 4a466bf48a887e3a2eba3e971a3a459b5cbc80be (diff) | |
fdt: Add function to read a clock rate from fdt
This reads the frequency of a named clock from the fdt.
BUG=chromium-os:23496
TEST=build and boot on Seaboard, T33, Kaen
Change-Id: Ib35bf7ef749f51862644218b1015057ca4e25203
Reviewed-on: https://gerrit.chromium.org/gerrit/12243
Reviewed-by: Che-Liang Chiou <clchiou@chromium.org>
Commit-Ready: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'common')
| -rw-r--r-- | common/fdt_decode.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/common/fdt_decode.c b/common/fdt_decode.c index 96807c47c9..3d956c3c16 100644 --- a/common/fdt_decode.c +++ b/common/fdt_decode.c @@ -718,3 +718,18 @@ int fdt_decode_region(const void *blob, int node, debug("%s: size=%zx\n", __func__, *size); return 0; } + +int fdt_decode_clock_rate(const void *blob, const char *clock_name, + ulong default_rate) +{ + int node; + + node = fdt_node_offset_by_compatible(blob, 0, "board-clocks"); + if (node >= 0) { + node = lookup_phandle(blob, node, clock_name); + if (node >= 0) + return get_int(blob, node, "clock-frequency", + default_rate); + } + return default_rate; +} |