linux-kernel - [PATCH 3/6] MIPS: Loongson64: Add support for the 2K1000 to get cpu_clock

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Message-Id: <20210209093224.7085-4-zhangqing@loongson.cn>
Date:   Tue,  9 Feb 2021 17:32:21 +0800
From:   Qing Zhang <zhangqing@...ngson.cn>
To:     Rob Herring <robh+dt@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Huacai Chen <chenhuacai@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Xingxing Su <suxingxing@...ngson.cn>
Subject: [PATCH 3/6] MIPS: Loongson64: Add support for the 2K1000 to get cpu_clock_freq

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

Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
Signed-off-by: Qing Zhang <zhangqing@...ngson.cn>
Signed-off-by: Xingxing Su <suxingxing@...ngson.cn>
---
 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