Add support for AmLogic GXBB clock controller

This series is based on the AmLogic Meson8b rewrite/cleanup[0]. The AmLogic GXBB is an ARMv8-based SoC, fed by a 24MHZ xtal, and it provides several PLLs, muxes dividers and gates to drive CPUs and peripherals.

While based on the Meson8b clock controller driver, this series adds supports for Multi-phase Locked Loops (mpll) and support for PLLs with fractional rates.

This series introduces the clock controller driver for the gxbb, including the DT binding description and accompanying change in the gxbb dtsi. Only three clocks are exposed via the headers in the dt-bindings include-chroot. More can be added later, but since these values represent an ABI I wanted to start small. I'm not sure about the names for the gate clocks, so I especially tried to avoid putting those in the binding (with the exception of the Ethernet gate, which Kevin has needed for a while).

Notably missing from this driver are the branch clocks (e.g. the mess of muxes and dividers that come after the PLLs and MPLLs). I could have guessed how things were wired up from the resources available to me, but I'm hoping to get some improved documentation soon and then I'll go back and fill them in.

[0] http://lkml.kernel.org/g/1465518467-23939-1-git-send-email-mturquette at baylibre.com

Michael Turquette (7):
clk: meson: add peripheral gate macro
clk: meson: add mpll support
clk: meson: fractional pll support
clk: gxbb: Document bindings for the GXBB clock controller
clk: gxbb: add AmLogic GXBB clk controller driver
arm64: amlogic: select gxbb clk driver
arm64: dts: gxbb clock controller

 .../bindings/clock/amlogic,gxbb-clkc.txt           |  36 +
 arch/arm64/Kconfig.platforms                       |   2 +
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi        |   7 +
 drivers/clk/meson/Kconfig                          |   7 +
 drivers/clk/meson/Makefile                         |   3 +-
 drivers/clk/meson/clk-mpll.c                       |  94 ++
 drivers/clk/meson/clk-pll.c                        |  32 +-
 drivers/clk/meson/clkc.h                           |  39 +
 drivers/clk/meson/gxbb.c                           | 954 +++++++++++++++++++++

 drivers/clk/meson/gxbb.h                           | 271 ++++++
 include/dt-bindings/clock/gxbb-clkc.h              |  12 +
 11 files changed, 1454 insertions(+), 3 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/clock/amlogic,gxbb-clkc.txt
 create mode 100644 drivers/clk/meson/clk-mpll.c
 create mode 100644 drivers/clk/meson/gxbb.c
 create mode 100644 drivers/clk/meson/gxbb.h
 create mode 100644 include/dt-bindings/clock/gxbb-clkc.h