In order to support Mailbox links for the Amlogic GXBB SoC, add a generic
platform MHU driver based on arm_mhu.c.

This patchset follows a RFC thread along the GXBB SCPI support at :
http://lkml.kernel.org/r/1466503374-28841-1-git-send-email-narmstrong at baylibre.com
And specific MHU discussions at :
http://lkml.kernel.org/r/CABb+yY3HqJG2+GMWCWF9PomxobrwWGZ=TZe5NvXPcHMDdLhkcQ at mail.gmail.com

Changes since v1 at http://lkml.kernel.org/r/1470732737-18391-1-git-send-email-narmstrong at baylibre.com :
 - Fix irq to signed to detect platform_get_irq() failures
 - Introduced back the secure channel
 - Fixed indexes

Changes since RFC v2 :
 - Rename to platform_mhu
 - Sync all link functions with arm_mhu

Neil Armstrong (3):
  mailbox: Add Platform Message-Handling-Unit variant driver
  dt-bindings: mailbox: Add Amlogic Meson MHU Bindings
  ARM64: dts: meson-gxbb: Add Meson MHU Node

 .../devicetree/bindings/mailbox/meson-mhu.txt      |  34 ++++
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi        |   9 +
 drivers/mailbox/Kconfig                            |  10 +
 drivers/mailbox/Makefile                           |   2 +
 drivers/mailbox/platform_mhu.c                     | 205 +++++++++++++++++++++
 5 files changed, 260 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mailbox/meson-mhu.txt
 create mode 100644 drivers/mailbox/platform_mhu.c

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1.9.1