ARM: imx: Add cpu frequency scaling support

Re-using iMX6Q driver for cpu frequency scaling.
Signed-off-by: NJohn Tobias <john.tobias.ph@gmail.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

arch/arm/mach-imx/mach-imx6sl.c

@@ -34,6 +34,13 @@ static void __init imx6sl_fec_init(void)
 	}
 }
 
+static void __init imx6sl_init_late(void)
+{
+	/* imx6sl reuses imx6q cpufreq driver */
+	if (IS_ENABLED(CONFIG_ARM_IMX6Q_CPUFREQ))
+		platform_device_register_simple("imx6q-cpufreq", -1, NULL, 0);
+}
+
 static void __init imx6sl_init_machine(void)
 {
 	struct device *parent;
@@ -70,6 +77,7 @@ DT_MACHINE_START(IMX6SL, "Freescale i.MX6 SoloLite (Device Tree)")
 	.map_io		= debug_ll_io_init,
 	.init_irq	= imx6sl_init_irq,
 	.init_machine	= imx6sl_init_machine,
+	.init_late      = imx6sl_init_late,
 	.dt_compat	= imx6sl_dt_compat,
 	.restart	= mxc_restart,
 MACHINE_END