ARM: at91: rework main and slow clk implementation

Hello,

This series introduce the real clock model (as described in atmel datasheets) for slow and main clocks.

The modifications introduced by this series break the DT compat, but, as the at91 CCF based implementation is pretty new (introduced in 3.14 only for sama5 eval boards) I think it won't impact a lot of users.

Nicolas, Mike, if this series is accepted, I'd like to get it merged as soon as possible to prevent other developpers from using a deprecated DT binding. Moreover, I think this series should go through the same path for both clk and DT changes (whatever path is chosen: either at91 or clk tree) because the changes are tightly coupled.

Best Regards,

Boris

Changes since v1:
- fix sam9rl main clk definition

Boris BREZILLON (11):
clk: at91: rework main clk implementation
clk: at91: update main clk documentation
clk: at91: add slow clks driver
clk: at91: add slow clk documentation
ARM: at91/dt: move sama5d3 SoC to the new main/slow clk model
ARM: at91/dt: add xtal frequencies to sama5d3xcm boards
ARM: at91/dt: add xtal frequencies to sama5d3 xplained board
ARM: at91/dt: move at91sam9261 SoC to the new main clock model
ARM: at91/dt: define main xtal frequency of the at91sam9261ek board
ARM: at91/dt: move at91sam9rl SoC to the new slow/main clock models
ARM: at91/dt: define sam9rlek crystal frequencies

 .../devicetree/bindings/clock/at91-clock.txt       |  128 ++++-
 arch/arm/boot/dts/at91-sama5d3_xplained.dts        |   10 +
 arch/arm/boot/dts/at91sam9261.dtsi                 |   10 +-
 arch/arm/boot/dts/at91sam9261ek.dts                |    4 +
 arch/arm/boot/dts/at91sam9rl.dtsi                  |   47 +-
 arch/arm/boot/dts/at91sam9rlek.dts                 |    8 +
 arch/arm/boot/dts/sama5d3.dtsi                     |   61 +-
 arch/arm/boot/dts/sama5d3xcm.dtsi                  |   10 +
 drivers/clk/at91/Makefile                          |    4 +-
 drivers/clk/at91/clk-main.c                        |  581 +++++++++++++++++---
 drivers/clk/at91/clk-slow.c                        |  467 ++++++++++++++++
 drivers/clk/at91/pmc.c                             |   12 +
 drivers/clk/at91/pmc.h                             |    9 +
 drivers/clk/at91/sckc.c                            |   57 ++
 drivers/clk/at91/sckc.h                            |   22 +
 include/linux/clk/at91_pmc.h                       |    1 +
 16 files changed, 1343 insertions(+), 88 deletions(-)
 create mode 100644 drivers/clk/at91/clk-slow.c
 create mode 100644 drivers/clk/at91/sckc.c
 create mode 100644 drivers/clk/at91/sckc.h

1.7.9.5