[PATCH v3] rtc/tpo: Driver to support rtc and wakeup on PowerNV platform

[Neelesh Gupta]

On 10/14/2014 02:08 PM, Neelesh Gupta wrote:
> 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.

Hi Alessandro,

Awaiting Ack from your side, so that we can take this through the 
powerpc tree.

Regards,
Neelesh

>
> Test results:
> -------------
> Host:
> [root at tul169p1 ~]# ls -l /sys/class/rtc/
> total 0
> lrwxrwxrwx 1 root root 0 Oct 14 03:07 rtc0 -> ../../devices/opal-rtc/rtc/rtc0
> [root at tul169p1 ~]# cat /sys/devices/opal-rtc/rtc/rtc0/time
> 08:10:07
> [root at tul169p1 ~]# echo `date '+%s' -d '+ 2 minutes'` > /sys/class/rtc/rtc0/wakealarm
> [root at tul169p1 ~]# cat /sys/class/rtc/rtc0/wakealarm
> 1413274345
> [root at tul169p1 ~]#
>
> FSP:
> $ smgr mfgState
> standby
> $ rtim timeofday
>
> System time is valid: 2014/10/14 08:12:04.225115
>
> $ smgr mfgState
> ipling
> $
>
> Signed-off-by: Neelesh Gupta <neelegup at linux.vnet.ibm.com>
> ---
>
> Changes in v3
> =============
> - Rebased to the latest tree.
>
> Changes in v2
> =============
> - Added Documentation/devicetree/bindings/rtc/rtc-opal.txt
> - Explicitly turn off RTC_UIE mode by setting 'rtc->uie_unsupported'
>
>   Documentation/devicetree/bindings/rtc/rtc-opal.txt |   16 +
>   arch/powerpc/include/asm/opal.h                    |    7 -
>   arch/powerpc/kernel/time.c                         |    1
>   arch/powerpc/platforms/powernv/opal-async.c        |    3
>   arch/powerpc/platforms/powernv/opal-rtc.c          |   65 +----
>   arch/powerpc/platforms/powernv/opal-wrappers.S     |    2
>   arch/powerpc/platforms/powernv/opal.c              |    6
>   arch/powerpc/platforms/powernv/setup.c             |    2
>   drivers/rtc/Kconfig                                |   11 +
>   drivers/rtc/Makefile                               |    1
>   drivers/rtc/rtc-opal.c                             |  261 ++++++++++++++++++++
>   11 files changed, 325 insertions(+), 50 deletions(-)
>   create mode 100644 Documentation/devicetree/bindings/rtc/rtc-opal.txt
>   create mode 100644 drivers/rtc/rtc-opal.c
>