[PATCH v3 0/5] clk: hisilicon: support stub clock

[Leo Yan]

This series adds support for hisilicon stub clock driver. On hi6220,
the bootloader needs load the firmware image and set info for OPPs;
after run into kernel, the stub clock driver is used to communicate
w/t firmware for cpu dynamic frequency scaling.

In patch series v1/v2, the stub clock driver simply writes request in
sram and send ipc to firmware; For patch series v3, the firmware has
been upgraded to use mailbox, so stub clock driver will call standard
mailbox APIs to request mailbox channel and send message to firmware.

These patches have been tested on 96board hikey and is used by cpufreq
driver.

Changes from v2:
* Use platform_device's probe for clock's initialization
* Use mailbox channel for clock frequency change

Changes from v1:
* Refine parameter checking for init flow
* Remove unnecessary debugging info
* Modify to check spinlock pointer when register clocks


Leo Yan (5):
  clk: hisi: refine parameter checking for init
  dt-bindings: arm: Hi6220: add doc for SRAM controller
  dt-bindings: clk: Hi6220: Document stub clock driver
  clk: Hi6220: add stub clock driver
  arm64: dts: add Hi6220's stub clock node

 .../bindings/arm/hisilicon/hisilicon.txt           |  18 ++
 .../devicetree/bindings/clock/hi6220-clock.txt     |  19 +-
 arch/arm64/boot/dts/hisilicon/hi6220.dtsi          |  23 ++
 drivers/clk/hisilicon/Kconfig                      |   2 +-
 drivers/clk/hisilicon/Makefile                     |   2 +-
 drivers/clk/hisilicon/clk-hi6220-stub.c            | 279 +++++++++++++++++++++
 drivers/clk/hisilicon/clk.c                        |  11 +-
 7 files changed, 343 insertions(+), 11 deletions(-)
 create mode 100644 drivers/clk/hisilicon/clk-hi6220-stub.c

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1.9.1