1 files changed, 24 insertions, 1 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 09660e2ab051..4bbca500d3d2 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1,4 +1,4 @@
-\#
+#
 # RTC class/drivers configuration
 #
 
@@ -95,6 +95,29 @@ config RTC_INTF_DEV_UIE_EMUL
 comment "RTC drivers"
         depends on RTC_CLASS
 
+# this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>
+# requires <asm/mc146818rtc.h> defining CMOS_READ/CMOS_WRITE, and a
+# global rtc_lock ... it's not yet just another platform_device.
+
+config RTC_DRV_CMOS
+        tristate "PC-style 'CMOS' real time clock"
+        depends on RTC_CLASS && (X86_PC || ALPHA || ARM26 || ARM \
+                || M32R || ATARI || POWERPC)
+        help
+          Say "yes" here to get direct support for the real time clock
+          found in every PC or ACPI-based system, and some other boards.
+          Specifically the original MC146818, compatibles like those in
+          PC south bridges, the DS12887 or M48T86, some multifunction
+          or LPC bus chips, and so on.
+
+          Your system will need to define the platform device used by
+          this driver, otherwise it won't be accessible.  This means
+          you can safely enable this driver if you don't know whether
+          or not your board has this kind of hardware.
+
+          This driver can also be built as a module. If so, the module
+          will be called rtc-cmos.
+
 config RTC_DRV_X1205
         tristate "Xicor/Intersil X1205"
         depends on RTC_CLASS && I2C