drivers/rtc/rtc-twl4030.c

This is a driver for the RTC in the TWL4030 family chips.

POSTED AS A TWL4030 MFD EXAMPLE -- NOT YET FOR MERGING.

As an example ... since it seems closest of the various sub-chip drivers to being ready for mainline. Why not yet for merging?

- This includes a cleanup patch that's not yet been merged into its primary copy (in the OMAP tree), removing needless headers that prevent building on non-OMAP systems.

- The <linux/i2c/...> header file should probably be removed ... nothing in it should be needed outside of the RTC driver.

- IRQ handling issues:

* This depends on the TWL4030 MFD core, which isn't merged
yet (and which may well need discussion first, now that it's been posted).

* It also depends on TWL4030 "power" interrupt handling,
which hasn't yet been submitted.

* I'm suspecting the IRQ handling is incorrect. Rather than
reading REG_PWR_ISR1 again (acking IRQs from other devices!) maybe it can just trigger on one (!) edge.

Other than those issues, I think this driver should pretty much be ready for mainline merge. It passes "rtctest" and seems fairly clean.

But as always, review is appreciated. We all have blind spots; many-eyes-helps, and all that. :)

---
 drivers/rtc/Kconfig             |   10 
 drivers/rtc/Makefile            |    1 
 drivers/rtc/rtc-twl4030.c       |  529 ++++++++++++++++++++++++++++++++++++++
 include/linux/i2c/twl4030-rtc.h |  172 ++++++++++++
 4 files changed, 712 insertions(+)

@@ -246,6 +246,16 @@ config RTC_DRV_TWL92330
 	  platforms.  The support is integrated with the rest of
 	  the Menelaus driver; it's not separate module.
 
+config RTC_DRV_TWL4030
+	tristate "TWL4030/TPS659x0 Real Time Clock"
+	depends on RTC_CLASS && TWL4030_CORE
+	help
+	  If you say yes here you get support for internal Real-Time
+	  Clock of TWL4030/TPS650x0 family chips.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called rtc-twl4030.
+
 config RTC_DRV_S35390A
 	tristate "Seiko Instruments S-35390A"
 	select BITREVERSE

@@ -56,6 +56,7 @@ obj-$(CONFIG_RTC_DRV_SA1100)	+= rtc-sa11
 obj-$(CONFIG_RTC_DRV_SH)	+= rtc-sh.o
 obj-$(CONFIG_RTC_DRV_STK17TA8)	+= rtc-stk17ta8.o
 obj-$(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_X1205)	+= rtc-x1205.o