ARM: imx: enable cpufreq for imx6q

It enables cpufreq support for imx6q with generic cpufreq-cpu0 driver.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx6q.dtsi

@@ -36,6 +36,14 @@
 			compatible = "arm,cortex-a9";
 			reg = <0>;
 			next-level-cache = <&L2>;
+			operating-points = <
+				/* kHz    uV */
+				792000  1100000
+				396000  950000
+				198000  850000
+			>;
+			clock-latency = <61036>; /* two CLK32 periods */
+			cpu0-supply = <&reg_cpu>;
 		};
 
 		cpu@1 {
@@ -447,7 +455,7 @@
 					anatop-max-voltage = <2750000>;
 				};
 
-				regulator-vddcore@140 {
+				reg_cpu: regulator-vddcore@140 {
 					compatible = "fsl,anatop-regulator";
 					regulator-name = "cpu";
 					regulator-min-microvolt = <725000>;

arch/arm/mach-imx/Kconfig

@@ -829,6 +829,8 @@ config	SOC_IMX53
 
 config SOC_IMX6Q
 	bool "i.MX6 Quad support"
+	select ARCH_HAS_CPUFREQ
+	select ARCH_HAS_OPP
 	select ARM_CPU_SUSPEND if PM
 	select ARM_GIC
 	select COMMON_CLK
@@ -841,6 +843,7 @@ config SOC_IMX6Q
 	select MFD_SYSCON
 	select PINCTRL
 	select PINCTRL_IMX6Q
+	select PM_OPP if PM
 
 	help
 	  This enables support for Freescale i.MX6 Quad processor.

arch/arm/mach-imx/clk-imx6q.c

@@ -406,6 +406,7 @@ int __init mx6q_clocks_init(void)
 	clk_register_clkdev(clk[cko1_sel], "cko1_sel", NULL);
 	clk_register_clkdev(clk[ahb], "ahb", NULL);
 	clk_register_clkdev(clk[cko1], "cko1", NULL);
+	clk_register_clkdev(clk[arm], NULL, "cpu0");
 
 	/*
 	 * The gpmi needs 100MHz frequency in the EDO/Sync mode,