[RFC net-next 00/15] Add support for Silicon Labs CPC

["Damien Riégel" <damien.riegel@silabs.com>]

Hi,


This patchset brings initial support for Silicon Labs CPC protocol,
standing for Co-Processor Communication. This protocol is used by the
EFR32 Series [1]. These devices offer a variety for radio protocols,
such as Bluetooth, Z-Wave, Zigbee [2].

Some of the devices support several protocols in one chipset, and the
main raison d'etre for CPC is to facilicate the co-existence of these
protocols by providing each radio stack a dedicated communication
channel over a shared physical link, such as SPI or SDIO.

These separate communication channels are called endpoints and the
protocol provides:
  - reliability by retransmitting unacknowledged packets. This is not
    part of the current patchset
  - ordered delivery
  - resource management, by avoiding sending packets to the radio
    co-processor if it doesn't have the room for receiving them

The current patchset showcases a full example with Bluetooth over SPI.
In the future, other buses should be supported, as well as other radio
protocols.

For the RFC, I've bundled everything together in a big module to avoid
submitting patches to different subsystems, but I expect to get comments
about that and the final version of these series will probably be split
into two or three modules. Please let me know if it makes sense or not:
  - net/cpc for the core implementation of the protocol
  - drivers/bluetooth/ for the bluetooth endpoint
  - optionally, the SPI driver could be separated from the main module
    and moved to drivers/spi

I've tried to split the patchset in digestible atomic commits but as
we're introducing a new protocol the first 12 commits are all needed to
get it to work. The SPI and Bluetooth driver are more standalone and
illustrates how new bus or radio protocols would be added in the future.

[1] https://www.silabs.com/wireless/gecko-series-2
[2] https://www.silabs.com/wireless

Damien Riégel (15):
  net: cpc: add base skeleton driver
  net: cpc: add endpoint infrastructure
  net: cpc: introduce CPC driver and bus
  net: cpc: add protocol header structure and API
  net: cpc: implement basic transmit path
  net: cpc: implement basic receive path
  net: cpc: implement sequencing and ack
  net: cpc: add support for connecting endpoints
  net: cpc: add support for RST frames
  net: cpc: make disconnect blocking
  net: cpc: add system endpoint
  net: cpc: create system endpoint with a new interface
  dt-bindings: net: cpc: add silabs,cpc-spi.yaml
  net: cpc: add SPI interface driver
  net: cpc: add Bluetooth HCI driver

 .../bindings/net/silabs,cpc-spi.yaml          |  54 ++
 MAINTAINERS                                   |   6 +
 drivers/net/Kconfig                           |   2 +
 drivers/net/Makefile                          |   1 +
 drivers/net/cpc/Kconfig                       |  16 +
 drivers/net/cpc/Makefile                      |   5 +
 drivers/net/cpc/ble.c                         | 147 +++++
 drivers/net/cpc/ble.h                         |  14 +
 drivers/net/cpc/cpc.h                         | 204 +++++++
 drivers/net/cpc/endpoint.c                    | 333 +++++++++++
 drivers/net/cpc/header.c                      | 237 ++++++++
 drivers/net/cpc/header.h                      |  83 +++
 drivers/net/cpc/interface.c                   | 308 ++++++++++
 drivers/net/cpc/interface.h                   | 117 ++++
 drivers/net/cpc/main.c                        | 163 ++++++
 drivers/net/cpc/protocol.c                    | 309 ++++++++++
 drivers/net/cpc/protocol.h                    |  27 +
 drivers/net/cpc/spi.c                         | 550 ++++++++++++++++++
 drivers/net/cpc/spi.h                         |  12 +
 drivers/net/cpc/system.c                      | 432 ++++++++++++++
 drivers/net/cpc/system.h                      |  14 +
 21 files changed, 3034 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/silabs,cpc-spi.yaml
 create mode 100644 drivers/net/cpc/Kconfig
 create mode 100644 drivers/net/cpc/Makefile
 create mode 100644 drivers/net/cpc/ble.c
 create mode 100644 drivers/net/cpc/ble.h
 create mode 100644 drivers/net/cpc/cpc.h
 create mode 100644 drivers/net/cpc/endpoint.c
 create mode 100644 drivers/net/cpc/header.c
 create mode 100644 drivers/net/cpc/header.h
 create mode 100644 drivers/net/cpc/interface.c
 create mode 100644 drivers/net/cpc/interface.h
 create mode 100644 drivers/net/cpc/main.c
 create mode 100644 drivers/net/cpc/protocol.c
 create mode 100644 drivers/net/cpc/protocol.h
 create mode 100644 drivers/net/cpc/spi.c
 create mode 100644 drivers/net/cpc/spi.h
 create mode 100644 drivers/net/cpc/system.c
 create mode 100644 drivers/net/cpc/system.h

-- 
2.49.0