[PATCH v2 1/5] lib: utils/fdt: Add fdt_parse_timebase_frequency() function
From: Anup Patel <hidden>
Date: 2021-09-24 03:26:38
Subsystem:
library code, the rest · Maintainers:
Andrew Morton, Linus Torvalds
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 <redacted> Reviewed-by: Bin Meng <redacted> --- include/sbi_utils/fdt/fdt_helper.h | 2 ++ lib/utils/fdt/fdt_helper.c | 21 +++++++++++++++++++++ 2 files changed, 23 insertions(+)
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) {
--
2.25.1