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lib: utils/fdt: Add fdt_parse_timebase_frequency() function

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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>
This commit is contained in:
Anup Patel
2021-09-14 21:05:42 +05:30
committed by Anup Patel
parent 51113fe2a5
commit 72154f4708
2 changed files with 23 additions and 0 deletions
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2
include/sbi_utils/fdt/fdt_helper.h
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@@ -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);

21
lib/utils/fdt/fdt_helper.c
View File

@@ -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)
{