rtc/tpo: Driver to support rtc and wakeup on PowerNV platform
The patch implements the OPAL rtc driver that binds with the rtc
driver subsystem. The driver uses the platform device infrastructure
to probe the rtc device and register it to rtc class framework. The
'wakeup' is supported depending upon the property 'has-tpo' present
in the OF node. It provides a way to load the generic rtc driver in
in the absence of an OPAL driver.
The patch also moves the existing OPAL rtc get/set time interfaces to the
new driver and exposes the necessary OPAL calls using EXPORT_SYMBOL_GPL.
Test results:
-------------
Host:
[root@tul169p1 ~]# ls -l /sys/class/rtc/
total 0
lrwxrwxrwx 1 root root 0 Oct 14 03:07 rtc0 -> ../../devices/opal-rtc/rtc/rtc0
[root@tul169p1 ~]# cat /sys/devices/opal-rtc/rtc/rtc0/time
08:10:07
[root@tul169p1 ~]# echo `date '+%s' -d '+ 2 minutes'` > /sys/class/rtc/rtc0/wakealarm
[root@tul169p1 ~]# cat /sys/class/rtc/rtc0/wakealarm
1413274345
[root@tul169p1 ~]#
FSP:
$ smgr mfgState
standby
$ rtim timeofday
System time is valid: 2014/10/14 08:12:04.225115
$ smgr mfgState
ipling
$
CC: devicetree@vger.kernel.org
CC: tglx@linutronix.de
CC: rtc-linux@googlegroups.com
CC: a.zummo@towertech.it
Signed-off-by: Neelesh Gupta <neelegup@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 6dd12dd..c8f0ec7 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -979,6 +979,17 @@
If you say yes here you get support for the RTC subsystem of the
NUC910/NUC920 used in embedded systems.
+config RTC_DRV_OPAL
+ tristate "IBM OPAL RTC driver"
+ depends on PPC_POWERNV
+ default y
+ help
+ If you say yes here you get support for the PowerNV platform RTC
+ driver based on OPAL interfaces.
+
+ This driver can also be built as a module. If so, the module
+ will be called rtc-opal.
+
comment "on-CPU RTC drivers"
config RTC_DRV_DAVINCI