rtc: add MAX8907 RTC driver

The MAX8907 is an I2C-based power-management IC containing voltage
regulators, a reset controller, a real-time clock, and a touch-screen
controller.

The driver is based on an original by or fixed by:
* Tom Cherry
* Prashant Gaikwad
* Joseph Yoon

During upstreaming, I (swarren):
* Converted to regmap.
* Fixed handling of RTC_HOUR register containing 12.
* Fixed handling of RTC_WEEKDAY register.
* General cleanup.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Cc: Tom Cherry <tcherry@nvidia.com>
Cc: Prashant Gaikwad <pgaikwad@nvidia.com>
Cc: Joseph Yoon <tyoon@nvidia.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>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 6309df4e2654..499fb9984abe 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -205,6 +205,16 @@ config RTC_DRV_MAX6900
           This driver can also be built as a module. If so, the module
           will be called rtc-max6900.
 
+config RTC_DRV_MAX8907
+        tristate "Maxim MAX8907"
+        depends on MFD_MAX8907
+        help
+          If you say yes here you will get support for the
+          RTC of Maxim MAX8907 PMIC.
+
+          This driver can also be built as a module. If so, the module
+          will be called rtc-max8907.
+
 config RTC_DRV_MAX8925
         tristate "Maxim MAX8925"
         depends on MFD_MAX8925