[PATCH] "RTC-framework" driver for DS1307 and similar RTC chips

This is an "RTC-framework" driver for DS1307 and similar RTC chips,

It should be a full replacement for the existing ds1337.c driver (using the
older RTC glue), giving a net increase in the number of RTC chips that work
out-of-the-box.  There's a whole cluster of RTCs that are very similar, but
the 1337 driver was a bit too picky to work with most of them.

Still no support for RTC alarm IRQs (on chips that support them).

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 875ff5e5792a..9e249650baf0 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -86,6 +86,24 @@ config RTC_DRV_X1205
           This driver can also be built as a module. If so, the module
           will be called rtc-x1205.
 
+config RTC_DRV_DS1307
+        tristate "Dallas/Maxim DS1307 and similar I2C RTC chips"
+        depends on RTC_CLASS && I2C
+        help
+          If you say yes here you get support for various compatible RTC
+          chips (often with battery backup) connected with I2C.  This driver
+          should handle DS1307, DS1337, DS1338, DS1339, DS1340, ST M41T00,
+          and probably other chips.  In some cases the RTC must already
+          have been initialized (by manufacturing or a bootloader).
+
+          The first seven registers on these chips hold an RTC, and other
+          registers may add features such as NVRAM, a trickle charger for
+          the RTC/NVRAM backup power, and alarms.  This driver may not
+          expose all those available chip features.
+
+          This driver can also be built as a module. If so, the module
+          will be called rtc-ds1307.
+
 config RTC_DRV_DS1672
         tristate "Dallas/Maxim DS1672"
         depends on RTC_CLASS && I2C