[PATCH v5 3/7] MIPS: Loongson64: Add support for the Loongson-2K1000 to get cpu_clock_freq

Qing Zhang
2021-03-15T07:51:11Z

Get the fixed-clock from the CPU0 node of the device tree.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Tested-by: Ming Wang <wangming01@loongson.cn>
---

v4-v5:
- Delete clk initializer

arch/mips/loongson64/time.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)

diff --git a/arch/mips/loongson64/time.c b/arch/mips/loongson64/time.c
index 91e842b58365..f6d2c1e30570 100644
--- a/arch/mips/loongson64/time.c
+++ b/arch/mips/loongson64/time.c
@@ -11,9 +11,33 @@
#include <asm/hpet.h>

#include <loongson.h>
+#include <linux/clk.h>
+#include <linux/of_clk.h>

void __init plat_time_init(void)
{
+ struct clk *clk;
+ struct device_node *np;
+
+ if (loongson_sysconf.fw_interface == LOONGSON_DTB) {
+ of_clk_init(NULL);
+
+ np = of_get_cpu_node(0, NULL);
+ if (!np) {
+ pr_err("Failed to get CPU node\n");
+ return;
+ }
+
+ clk = of_clk_get(np, 0);
+ if (IS_ERR(clk)) {
+ pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
+ return;
+ }
+
+ cpu_clock_freq = clk_get_rate(clk);
+ clk_put(clk);
+ }
+
/* setup mips r4k timer */
mips_hpt_frequency = cpu_clock_freq / 2;

--
2.20.1