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
