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| author | Anup Patel <anup.patel@wdc.com> | 2021-09-14 18:35:42 +0300 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2021-09-26 17:22:07 +0300 |
| commit | 72154f4708de79816f0178b16223afa352b20e30 (patch) | |
| tree | a1800b08659ab8da4fa9dc0da63aaca26d806259 | |
| parent | 51113fe2a5ac6b5a712f2e5393347bf24194c09b (diff) | |
| download | opensbi-72154f4708de79816f0178b16223afa352b20e30.tar.xz | |
lib: utils/fdt: Add fdt_parse_timebase_frequency() function
We add fdt_parse_timebase_frequency() function which can be used
by ACLINT mtimer driver and platform code to get timebase frequency.
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Xiang W <wxjstz@126.com>
| -rw-r--r-- | include/sbi_utils/fdt/fdt_helper.h | 2 | ||||
| -rw-r--r-- | lib/utils/fdt/fdt_helper.c | 21 |
2 files changed, 23 insertions, 0 deletions
diff --git a/include/sbi_utils/fdt/fdt_helper.h b/include/sbi_utils/fdt/fdt_helper.h index 2246254..5cb7340 100644 --- a/include/sbi_utils/fdt/fdt_helper.h +++ b/include/sbi_utils/fdt/fdt_helper.h @@ -50,6 +50,8 @@ int fdt_parse_hart_id(void *fdt, int cpu_offset, u32 *hartid); int fdt_parse_max_hart_id(void *fdt, u32 *max_hartid); +int fdt_parse_timebase_frequency(void *fdt, unsigned long *freq); + int fdt_parse_gaisler_uart_node(void *fdt, int nodeoffset, struct platform_uart_data *uart); diff --git a/lib/utils/fdt/fdt_helper.c b/lib/utils/fdt/fdt_helper.c index 5628337..5bf4021 100644 --- a/lib/utils/fdt/fdt_helper.c +++ b/lib/utils/fdt/fdt_helper.c @@ -269,6 +269,27 @@ int fdt_parse_max_hart_id(void *fdt, u32 *max_hartid) return 0; } +int fdt_parse_timebase_frequency(void *fdt, unsigned long *freq) +{ + const fdt32_t *val; + int len, cpus_offset; + + if (!fdt || !freq) + return SBI_EINVAL; + + cpus_offset = fdt_path_offset(fdt, "/cpus"); + if (cpus_offset < 0) + return cpus_offset; + + val = fdt_getprop(fdt, cpus_offset, "timebase-frequency", &len); + if (len > 0 && val) + *freq = fdt32_to_cpu(*val); + else + return SBI_ENOENT; + + return 0; +} + int fdt_parse_gaisler_uart_node(void *fdt, int nodeoffset, struct platform_uart_data *uart) { |