Adds PMU and S2R support for exynos5420

Hi Kukjin,

Quoted 69 lines

Rebased on
1] Kukjin Kim's tree, for-next branch
https://git.kernel.org/cgit/linux/kernel/git/kgene/linux-samsung.git/log/?h=for-next
2] Pankaj Dubey's v9 PMU patchset
http://www.spinics.net/lists/arm-kernel/msg367939.html

changes since v8:
- addressed abhilash's comments to remove the restoring of the CPU0 low power state register, since it will taken care in mcpm s2r patch from abhilash.

changes since v7:
- rebased on pankaj's latest patchset.

changes since v6:
- rebased on 3.17.rc1.

changes since v5:
- Refactored pm.c to use DT based lookup as suggested by Tomasz Figa.

changes since v4:
- Adressed comments from Tomasz figa and rebased on Pankaj Dubey's v5 PMU patchset

changes since v3:
Addressed the following comments from Pankaj Dubey, Bartlomiej Zolnierkiewicz, Tomasz Figa and Alim Akhtar:
- Moved EXYNOS5420_USE_STANDBY_WFI_ALL define to regs-pmu.h.
- Merged exynos5420_set_core_flag function into powerdown_conf.
- Removed XXTI_DURATION3 register setting.
- Updated the commit message and ordered the clock registers in clock patch.
- Removed the code for SYS_DISP1_BLK_CFG handling.
- Modified SoC checks to A9 specific checks in PM code.
- Updated some comments in the code and added macros for register offsets.
- Fixed code which was changing pad retention code for older SoCs.

changes since v2:
- Addressed comments from Tomasz figa
- rebased on Pankaj's V3 patchset https://lkml.org/lkml/2014/5/2/612
- dropped patch "ARM: dts: Add node for GPIO keys on SMDK5420", will be sent separately.

changes since v1:
- Addressed comments from Tomasz figa.
- restructured/consolidated as per Tomasz figa's PM consolidations for exynos

Tested on Kukjin Kim's tree, for-next branch +
1] http://www.spinics.net/lists/linux-samsung-soc/msg33750.html
2] https://www.mail-archive.com/linux-samsung-soc at vger.kernel.org/msg37260.html 3] with the CLK_IGNORE_UNUSED flag for aclk200_disp1 CLK

on Exynos5420 based chromebook (peach-pit board)

Below procedures were followed to test S2R:
Procedure A:
1. make multi_v7_defconfig
2 enable MCPM for 5420
3. enable S3C RTC
5. echo +20 > /sys/class/rtc/rtc0/wakealarm && echo mem > /sys/power/state
Procedure B:
1. make exynos_defconfig
4. echo +20 > /sys/class/rtc/rtc0/wakealarm && echo mem > /sys/power/state

Abhilash Kesavan (1):
ARM: exynos5: Add PMU support for 5420

Vikas Sajjan (1):
ARM: exynos5: Add Suspend-to-RAM support for 5420

Quoted 5 lines

 arch/arm/mach-exynos/pmu.c      |  287 +++++++++++++++++++++++++++++++++++++++
 arch/arm/mach-exynos/regs-pmu.h |  227 +++++++++++++++++++++++++++++++
 arch/arm/mach-exynos/suspend.c  |  151 +++++++++++++++++++-
 3 files changed, 663 insertions(+), 2 deletions(-)

Can you please pick this series.