qcom: Add runtime PM support

The patches add runtime PM support (using PM clocks) for devices in qcom SoCs. Also converts serial/sdhci/i2c and spi drivers to cleanup clock handling and use runtime PM apis instead.

There are a couple [1][2] of other patch series that this one is based off, so I have pushed a branch [3] with all the dependecies if anyone wants to play with this series.
I have been able to test the serial and sdhci driver changes to a fair extent, i2c for a sucessfull probe and could not test anything on spi. So any testing on these drivers is highly appreciated.

[1] https://www.mail-archive.com/linux-arm-msm at vger.kernel.org/msg14157.html
[2] https://www.mail-archive.com/linux-arm-msm at vger.kernel.org/msg14268.html
[3] https://github.com/rrnayak/linux/tree/v4.0/runtime-rfc

Rajendra Nayak (6):
PM / clock_ops: Make pm_clk_notify() do nothing in case DT passes
power-domains
clk: qcom: Add runtime support to handle clocks using PM clocks
serial: msm: convert driver to use runtime PM apis
mmc: sdhci-msm: convert driver to use runtime PM apis
i2c: qup: Get rid of clock handling as its done using runtime
callbacks
spi: qup: Get rid of clock handling as its done using runtime
callbacks

 drivers/base/power/clock_ops.c  |  8 ++++-
 drivers/clk/qcom/gdsc.c         | 20 +++++++++++
 drivers/i2c/busses/i2c-qup.c    | 74 +++++++++--------------------------------
 drivers/mmc/host/sdhci-msm.c    | 46 ++++++-------------------
 drivers/spi/spi-qup.c           | 54 ++++++------------------------
 drivers/tty/serial/msm_serial.c | 33 +++++++++---------
 6 files changed, 80 insertions(+), 155 deletions(-)

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