[PATCH v2 0/2] Add support for DSP IPC protocol driver

[Daniel Baluta]

Hifi4 DSP can be found on some i.MX8 platforms (e.g i.MX8QXP, i.MX8QM).
This patch series introduces the layer that allows Host CPU to
communicate with DSP.

This layer provides a doorbell and clients can used that to notify DSP
that a message is placed somewhere in the shared memory.

The protocol used is request - reply. Usually, Host/DSP write a message
in a shared memory area and notify the other side. The other side will
also write a reply in a designated shared memory area and then ring
the doorbell to let the counterpart that a message is ready.

Changes since v1: (after Rob's and Oleksij comments)
	- removed imx_dsp_get_handle now drivers wanting to use DSP IPC
          will get a reference to dsp_ipc node in dts.
        - added chip name in compatible string fsl,imx8qxp-dsp
	- avoid memory leaks
	- make dt_binding_check works fine now!

Daniel Baluta (2):
  firmware: imx: Add DSP IPC protocol interface
  dt-bindings: dsp: fsl: Add DSP IPC binding support

 .../devicetree/bindings/dsp/fsl,dsp_ipc.yaml  |  44 ++++++
 drivers/firmware/imx/Kconfig                  |  11 ++
 drivers/firmware/imx/Makefile                 |   1 +
 drivers/firmware/imx/imx-dsp.c                | 142 ++++++++++++++++++
 include/linux/firmware/imx/dsp.h              |  67 +++++++++
 5 files changed, 265 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dsp/fsl,dsp_ipc.yaml
 create mode 100644 drivers/firmware/imx/imx-dsp.c
 create mode 100644 include/linux/firmware/imx/dsp.h

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2.17.1