imx: introduce CONFIG_GPT_TIMER

Introduce a new config symbol to select the i.MX
General Purpose Timer (GPT).
Signed-off-by: NStefan Agner <stefan.agner@toradex.com>
Reviewed-by: NFabio Estevam <fabio.estevam@nxp.com>

arch/arm/mach-imx/Kconfig

@@ -10,6 +10,9 @@ config ROM_UNIFIED_SECTIONS
 config SYSCOUNTER_TIMER
 	bool
 
+config GPT_TIMER
+	bool
+
 config IMX_RDC
 	bool "i.MX Resource domain controller driver"
 	depends on ARCH_MX6 || ARCH_MX7

arch/arm/mach-imx/Makefile

@@ -11,7 +11,8 @@ ifeq ($(SOC),$(filter $(SOC),mx25 mx35 mx5 mx6 mx7 vf610))
 obj-y	= iomux-v3.o
 endif
 ifeq ($(SOC),$(filter $(SOC),mx5 mx6))
-obj-y	+= timer.o cpu.o speed.o
+obj-y	+= cpu.o speed.o
+obj-$(CONFIG_GPT_TIMER) += timer.o
 obj-$(CONFIG_SYS_I2C_MXC) += i2c-mxv7.o
 endif
 ifeq ($(SOC),$(filter $(SOC),mx7 mx6 mxs))

arch/arm/mach-imx/mx5/Kconfig

 if ARCH_MX5
 
 config MX5
+	select GPT_TIMER
 	bool
 	default y
 

arch/arm/mach-imx/mx6/Kconfig

@@ -9,6 +9,7 @@ config MX6_SMP
 
 config MX6
 	select ARM_ERRATA_743622 if !MX6UL && !MX6ULL
+	select GPT_TIMER
 	bool
 	default y
 	imply CMD_FUSE