[PATCH 3/6] MIPS: Loongson64: Add support for the 2K1000 to get cpu_clock_freq

[Qing Zhang]

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

Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
Signed-off-by: Qing Zhang <zhangqing@xxxxxxxxxxx>
Signed-off-by: Xingxing Su <suxingxing@xxxxxxxxxxx>
---
 arch/mips/loongson64/time.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/mips/loongson64/time.c b/arch/mips/loongson64/time.c
index 91e842b58365..45698b18f4ae 100644
--- a/arch/mips/loongson64/time.c
+++ b/arch/mips/loongson64/time.c
@@ -11,9 +11,23 @@
 #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 = NULL;
+	struct device_node *np;
+
+	of_clk_init(NULL);
+
+	np = of_get_cpu_node(0, NULL);
+	clk = of_clk_get(np, 0);
+	if (clk) {
+		cpu_clock_freq = clk_get_rate(clk);
+		clk_put(clk);
+	}
+
 	/* setup mips r4k timer */
 	mips_hpt_frequency = cpu_clock_freq / 2;
 
-- 
2.20.1