drivers/rtc: add support for Qualcomm PMIC8xxx RTC

Add support for PMIC8xxx based RTC.  PMIC8xxx is Qualcomm's power
management IC that internally houses an RTC module.  This driver
communicates with the PMIC module over SSBI bus.

[akpm@linux-foundation.org: cosmetic tweaks]
Acked-by: Wan ZongShun <mcuos.com@gmail.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Wan ZongShun <mcuos.com@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/Kconfig

@@ -1034,6 +1034,16 @@ config RTC_DRV_LPC32XX
 	  This driver can also be buillt as a module. If so, the module
 	  will be called rtc-lpc32xx.
 
+config RTC_DRV_PM8XXX
+	tristate "Qualcomm PMIC8XXX RTC"
+	depends on MFD_PM8XXX
+	help
+	  If you say yes here you get support for the
+	  Qualcomm PMIC8XXX RTC.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called rtc-pm8xxx.
+
 config RTC_DRV_TEGRA
 	tristate "NVIDIA Tegra Internal RTC driver"
 	depends on RTC_CLASS && ARCH_TEGRA

drivers/rtc/Makefile

@@ -77,6 +77,7 @@ obj-$(CONFIG_RTC_DRV_PCF2123)	+= rtc-pcf2123.o
 obj-$(CONFIG_RTC_DRV_PCF50633)	+= rtc-pcf50633.o
 obj-$(CONFIG_RTC_DRV_PL030)	+= rtc-pl030.o
 obj-$(CONFIG_RTC_DRV_PL031)	+= rtc-pl031.o
+obj-$(CONFIG_RTC_DRV_PM8XXX)	+= rtc-pm8xxx.o
 obj-$(CONFIG_RTC_DRV_PS3)	+= rtc-ps3.o
 obj-$(CONFIG_RTC_DRV_PUV3)	+= rtc-puv3.o
 obj-$(CONFIG_RTC_DRV_PXA)	+= rtc-pxa.o