rtc: rtc-wm8350: add support for WM8350 RTC

This adds support for the RTC provided by the Wolfson Microelectronics
WM8350.

This driver was originally written by Graeme Gregory and Liam Girdwood,
though it has been modified since then to update it to current mainline
coding standards and for API completeness.

[akpm@linux-foundation.org: s/schedule_timeout_interruptible/schedule_timeout_uninterruptible/ to prevent bogus timeout when signal_pending()]
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: David Brownell <david-b@pacbell.net>
Cc: Liam Girdwood <linux@wolfsonmicro.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/Kconfig

@@ -468,6 +468,16 @@ config RTC_DRV_V3020
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-v3020.
 
+config RTC_DRV_WM8350
+	tristate "Wolfson Microelectronics WM8350 RTC"
+	depends on MFD_WM8350
+	help
+	  If you say yes here you will get support for the RTC subsystem
+	  of the Wolfson Microelectronics WM8350.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called "rtc-wm8350".
+
 comment "on-CPU RTC drivers"
 
 config RTC_DRV_OMAP

drivers/rtc/Makefile

@@ -66,4 +66,5 @@ obj-$(CONFIG_RTC_DRV_TEST)	+= rtc-test.o
 obj-$(CONFIG_RTC_DRV_TWL4030)	+= rtc-twl4030.o
 obj-$(CONFIG_RTC_DRV_V3020)	+= rtc-v3020.o
 obj-$(CONFIG_RTC_DRV_VR41XX)	+= rtc-vr41xx.o
+obj-$(CONFIG_RTC_DRV_WM8350)	+= rtc-wm8350.o
 obj-$(CONFIG_RTC_DRV_X1205)	+= rtc-x1205.o

include/linux/mfd/wm8350/rtc.h

@@ -261,6 +261,8 @@
 
 struct wm8350_rtc {
 	struct platform_device *pdev;
+	struct rtc_device *rtc;
+	int alarm_enabled;      /* used over suspend/resume */
 };
 
 #endif