diff options
| -rw-r--r-- | common/fdt_decode.c | 15 | ||||
| -rw-r--r-- | include/fdt_decode.h | 15 |
2 files changed, 30 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; +} diff --git a/include/fdt_decode.h b/include/fdt_decode.h index 6087c21861..68d31653b5 100644 --- a/include/fdt_decode.h +++ b/include/fdt_decode.h @@ -614,3 +614,18 @@ int fdt_decode_nand(const void *blob, int node, struct fdt_nand *config); */ int fdt_decode_region(const void *blob, int node, const char *prop_name, void **ptrp, size_t *size); + +/** + * Look up the required rate of a particular clock in the FDT. + * + * These are expected to be in a board-clocks compatible node, with a + * property pointing to the phandle of each clock. The clock-frequency + * property in that phandle is returned. + * + * @param blob FDT blob + * @param clock_name Name of clock to look up (must name a phandle) + * @param default_rate Default clock rate to return if property not found + * @return clock rate as found in FDT, or default_rate if not found + */ +int fdt_decode_clock_rate(const void *blob, const char *clock_name, + ulong default_rate); |