--- a/arch/mips/include/asm/mach-ralink/mt7621.h
+++ b/arch/mips/include/asm/mach-ralink/mt7621.h
@@ -17,6 +17,10 @@
 #define SYSC_REG_CHIP_REV		0x0c
 #define SYSC_REG_SYSTEM_CONFIG0		0x10
 #define SYSC_REG_SYSTEM_CONFIG1		0x14
+#define SYSC_REG_CLKCFG0		0x2c
+#define SYSC_REG_CUR_CLK_STS		0x44
+
+#define MEMC_REG_CPU_PLL		0x648
 
 #define CHIP_REV_PKG_MASK		0x1
 #define CHIP_REV_PKG_SHIFT		16
@@ -24,6 +28,22 @@
 #define CHIP_REV_VER_SHIFT		8
 #define CHIP_REV_ECO_MASK		0xf
 
+#define XTAL_MODE_SEL_MASK		0x7
+#define XTAL_MODE_SEL_SHIFT		6
+
+#define CPU_CLK_SEL_MASK		0x3
+#define CPU_CLK_SEL_SHIFT		30
+
+#define CUR_CPU_FDIV_MASK		0x1f
+#define CUR_CPU_FDIV_SHIFT		8
+#define CUR_CPU_FFRAC_MASK		0x1f
+#define CUR_CPU_FFRAC_SHIFT		0
+
+#define CPU_PLL_PREDIV_MASK		0x3
+#define CPU_PLL_PREDIV_SHIFT		12
+#define CPU_PLL_FBDIV_MASK		0x7f
+#define CPU_PLL_FBDIV_SHIFT		4
+
 #define MT7621_DRAM_BASE                0x0
 #define MT7621_DDR2_SIZE_MIN		32
 #define MT7621_DDR2_SIZE_MAX		256
--- a/arch/mips/ralink/mt7621.c
+++ b/arch/mips/ralink/mt7621.c
@@ -10,6 +10,10 @@
 #include <linux/slab.h>
 #include <linux/sys_soc.h>
 #include <linux/jiffies.h>
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <dt-bindings/clock/mt7621-clk.h>
 
 #include <asm/mipsregs.h>
 #include <asm/smp-ops.h>
@@ -18,6 +22,7 @@
 #include <asm/mach-ralink/mt7621.h>
 #include <asm/mips-boards/launch.h>
 #include <asm/delay.h>
+#include <asm/time.h>
 
 #include <pinmux.h>
 
@@ -108,11 +113,89 @@ static struct rt2880_pmx_group mt7621_pi
 	{ 0 }
 };
 
+static struct clk *clks[MT7621_CLK_MAX];
+static struct clk_onecell_data clk_data = {
+	.clks = clks,
+	.clk_num = ARRAY_SIZE(clks),
+};
+
 phys_addr_t mips_cpc_default_phys_base(void)
 {
 	panic("Cannot detect cpc address");
 }
 
+static struct clk *__init mt7621_add_sys_clkdev(
+	const char *id, unsigned long rate)
+{
+	struct clk *clk;
+	int err;
+
+	clk = clk_register_fixed_rate(NULL, id, NULL, 0, rate);
+	if (IS_ERR(clk))
+		panic("failed to allocate %s clock structure", id);
+
+	err = clk_register_clkdev(clk, id, NULL);
+	if (err)
+		panic("unable to register %s clock device", id);
+
+	return clk;
+}
+
+void __init ralink_clk_init(void)
+{
+	u32 syscfg, xtal_sel, clkcfg, clk_sel, curclk, ffiv, ffrac;
+	u32 pll, prediv, fbdiv;
+	u32 xtal_clk, cpu_clk, bus_clk;
+	const static u32 prediv_tbl[] = {0, 1, 2, 2};
+
+	syscfg = rt_sysc_r32(SYSC_REG_SYSTEM_CONFIG0);
+	xtal_sel = (syscfg >> XTAL_MODE_SEL_SHIFT) & XTAL_MODE_SEL_MASK;
+
+	clkcfg = rt_sysc_r32(SYSC_REG_CLKCFG0);
+	clk_sel = (clkcfg >> CPU_CLK_SEL_SHIFT) & CPU_CLK_SEL_MASK;
+
+	curclk = rt_sysc_r32(SYSC_REG_CUR_CLK_STS);
+	ffiv = (curclk >> CUR_CPU_FDIV_SHIFT) & CUR_CPU_FDIV_MASK;
+	ffrac = (curclk >> CUR_CPU_FFRAC_SHIFT) & CUR_CPU_FFRAC_MASK;
+
+	if (xtal_sel <= 2)
+		xtal_clk = 20 * 1000 * 1000;
+	else if (xtal_sel <= 5)
+		xtal_clk = 40 * 1000 * 1000;
+	else
+		xtal_clk = 25 * 1000 * 1000;
+
+	switch (clk_sel) {
+	case 0:
+		cpu_clk = 500 * 1000 * 1000;
+		break;
+	case 1:
+		pll = rt_memc_r32(MEMC_REG_CPU_PLL);
+		fbdiv = (pll >> CPU_PLL_FBDIV_SHIFT) & CPU_PLL_FBDIV_MASK;
+		prediv = (pll >> CPU_PLL_PREDIV_SHIFT) & CPU_PLL_PREDIV_MASK;
+		cpu_clk = ((fbdiv + 1) * xtal_clk) >> prediv_tbl[prediv];
+		break;
+	default:
+		cpu_clk = xtal_clk;
+	}
+
+	cpu_clk = cpu_clk / ffiv * ffrac;
+	bus_clk = cpu_clk / 4;
+
+	clks[MT7621_CLK_CPU] = mt7621_add_sys_clkdev("cpu", cpu_clk);
+	clks[MT7621_CLK_BUS] = mt7621_add_sys_clkdev("bus", bus_clk);
+
+	pr_info("CPU Clock: %dMHz\n", cpu_clk / 1000000);
+	mips_hpt_frequency = cpu_clk / 2;
+}
+
+static void __init mt7621_clocks_init_dt(struct device_node *np)
+{
+	of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
+}
+
+CLK_OF_DECLARE(mt7621, "mediatek,mt7621-pll", mt7621_clocks_init_dt);
+
 void __init ralink_of_remap(void)
 {
 	rt_sysc_membase = plat_of_remap_node("mtk,mt7621-sysc");
--- a/arch/mips/ralink/timer-gic.c
+++ b/arch/mips/ralink/timer-gic.c
@@ -9,14 +9,14 @@
 
 #include <linux/of.h>
 #include <linux/of_clk.h>
-#include <linux/clocksource.h>
+#include <asm/time.h>
 
 #include "common.h"
 
 void __init plat_time_init(void)
 {
 	ralink_of_remap();
-
+	ralink_clk_init();
 	of_clk_init(NULL);
 	timer_probe();
 }
--- /dev/null
+++ b/include/dt-bindings/clock/mt7621-clk.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2018 Weijie Gao <hackpascal@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#ifndef __DT_BINDINGS_MT7621_CLK_H
+#define __DT_BINDINGS_MT7621_CLK_H
+
+#define MT7621_CLK_CPU		0
+#define MT7621_CLK_BUS		1
+
+#define MT7621_CLK_MAX		2
+
+#endif /* __DT_BINDINGS_MT7621_CLK_H */
