rtc: mxc_rtc: remove cpu_is_xxx by using platform_device_id

It changes the driver to use platform_device_id rather than cpu_is_xxx
to determine the controller type, and updates the platform code
accordingly.

As the result, mach/hardware.h inclusion gets removed from the driver.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: rtc-linux@googlegroups.com
diff --git a/arch/arm/mach-imx/devices/devices-common.h b/arch/arm/mach-imx/devices/devices-common.h
index 30a842f..1472f0f 100644
--- a/arch/arm/mach-imx/devices/devices-common.h
+++ b/arch/arm/mach-imx/devices/devices-common.h
@@ -292,6 +292,7 @@
 
 /* mxc_rtc */
 struct imx_mxc_rtc_data {
+	const char *devid;
 	resource_size_t iobase;
 	resource_size_t irq;
 };
diff --git a/arch/arm/mach-imx/devices/platform-mxc_rtc.c b/arch/arm/mach-imx/devices/platform-mxc_rtc.c
index daaf979..f35f848 100644
--- a/arch/arm/mach-imx/devices/platform-mxc_rtc.c
+++ b/arch/arm/mach-imx/devices/platform-mxc_rtc.c
@@ -9,20 +9,21 @@
 #include <mach/hardware.h>
 #include "devices-common.h"
 
-#define imx_mxc_rtc_data_entry_single(soc)				\
+#define imx_mxc_rtc_data_entry_single(soc, _devid)			\
 	{								\
+		.devid = _devid,					\
 		.iobase = soc ## _RTC_BASE_ADDR,			\
 		.irq = soc ## _INT_RTC,					\
 	}
 
 #ifdef CONFIG_SOC_IMX31
 const struct imx_mxc_rtc_data imx31_mxc_rtc_data __initconst =
-	imx_mxc_rtc_data_entry_single(MX31);
+	imx_mxc_rtc_data_entry_single(MX31, "imx21-rtc");
 #endif /* ifdef CONFIG_SOC_IMX31 */
 
 #ifdef CONFIG_SOC_IMX35
 const struct imx_mxc_rtc_data imx35_mxc_rtc_data __initconst =
-	imx_mxc_rtc_data_entry_single(MX35);
+	imx_mxc_rtc_data_entry_single(MX35, "imx21-rtc");
 #endif /* ifdef CONFIG_SOC_IMX35 */
 
 struct platform_device *__init imx_add_mxc_rtc(
@@ -40,6 +41,6 @@
 		},
 	};
 
-	return imx_add_platform_device("mxc_rtc", -1,
+	return imx_add_platform_device(data->devid, -1,
 			res, ARRAY_SIZE(res), NULL, 0);
 }