[PATCH v2 1/5] lib: utils/fdt: Add fdt_parse_timebase_frequency() function

[Anup Patel]

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 at wdc.com>
Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
---
 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