[PATCH v9 0/7] Add support for mt8183 SCP.

[Pi-Hsun Shih <pihsun@chromium.org>]

Add support for controlling and communicating with mt8183's system
control processor (SCP), using the remoteproc & rpmsg framework.
And also add a cros_ec driver for CrOS EC host command over rpmsg.

The overall structure of the series is:
* remoteproc/mtk_scp.c: Control the start / stop of SCP (Patch 2, 3).
* remoteproc/mtk_scp_ipi.c: Communicates to SCP using inter-processor
  interrupt (IPI) and shared memory (Patch 2, 3).
* rpmsg/mtk_rpmsg.c: Wrapper to wrap the IPI communication into a rpmsg
  device. Supports name service for SCP firmware to
  announce channels (Patch 4).
* platform/chrome/cros_ec_rpmsg.c: Communicates with the SCP over the
  rpmsg framework (like what platform/chrome/cros_ec_{i2c,spi}.c does)
  (Patch 5, 6).
* add scp dts node to mt8183 platform (Patch 7).

This series (In particular, Patch 7) is based on
https://patchwork.kernel.org/cover/10962385/.

Changes from v8:
 - Rebased onto https://patchwork.kernel.org/cover/10962385/.
 - Drop merged cros_ec_rpmsg patch, and add scp dts node patch.
 - Add more reserved memory region.

Changes from v7:
 - Rebase onto https://lore.kernel.org/patchwork/patch/1059196/.
 - Fix clock enable/disable timing for SCP driver.
 - Add more SCP IPI ID.

Changes from v6:
 - Decouple mtk_rpmsg from mtk_scp.
 - Change data of EC response to be aligned to 4 bytes.

Changes from v5:
 - Add device tree binding document for cros_ec_rpmsg.
 - Better document in comments for cros_ec_rpmsg.
 - Remove dependency on CONFIG_ in binding tree document.

Changes from v4:
 - Merge patch 6 (Load ELF firmware) into patch 2, so the driver loads
   ELF firmware by default, and no longer accept plain binary.
 - rpmsg_device listed in device tree (as a child of the SCP node) would
   have it's device tree node mapped to the rpmsg_device, so the rpmsg
   driver can use the properties on device tree.

Changes from v3:
 - Make writing to SCP SRAM aligned.
 - Add a new patch (Patch 6) to load ELF instead of bin firmware.
 - Add host event support for EC driver.
 - Fix some bugs found in testing (missing spin_lock_init,
   rproc_subdev_unprepare to rproc_subdev_stop).
 - Fix some coding style issue found by checkpatch.pl.

Changes from v2:
 - Fold patch 3 into patch 2 in v2.
 - Move IPI id around to support cross-testing for old and new firmware.
 - Finish more TODO items.

Changes from v1:
 - Extract functions and rename variables in mtk_scp.c.
 - Do cleanup properly in mtk_rpmsg.c, which also removes the problem of
   short-lived work items.
 - Code format fix based on feedback for cros_ec_rpmsg.c.
 - Extract feature detection for SCP into separate patch (Patch 6).

Eddie Huang (1):
  arm64: dts: mt8183: add scp node

Erin Lo (3):
  dt-bindings: Add a binding for Mediatek SCP
  remoteproc/mediatek: add SCP support for mt8183
  remoteproc: mt8183: add reserved memory manager API

Pi-Hsun Shih (3):
  rpmsg: add rpmsg support for mt8183 SCP.
  dt-bindings: Add binding for cros-ec-rpmsg.
  mfd: cros_ec: differentiate SCP from EC by feature bit.

 .../devicetree/bindings/mfd/cros-ec.txt       |   5 +-
 .../bindings/remoteproc/mtk,scp.txt           |  36 +
 arch/arm64/boot/dts/mediatek/mt8183-evb.dts   |  18 +
 arch/arm64/boot/dts/mediatek/mt8183.dtsi      |  12 +
 drivers/mfd/cros_ec_dev.c                     |  10 +
 drivers/remoteproc/Kconfig                    |  10 +
 drivers/remoteproc/Makefile                   |   1 +
 drivers/remoteproc/mtk_common.h               |  77 ++
 drivers/remoteproc/mtk_scp.c                  | 678 ++++++++++++++++++
 drivers/remoteproc/mtk_scp_ipi.c              | 163 +++++
 drivers/rpmsg/Kconfig                         |   9 +
 drivers/rpmsg/Makefile                        |   1 +
 drivers/rpmsg/mtk_rpmsg.c                     | 396 ++++++++++
 include/linux/mfd/cros_ec.h                   |   1 +
 include/linux/mfd/cros_ec_commands.h          |   2 +-
 include/linux/platform_data/mtk_scp.h         | 167 +++++
 include/linux/rpmsg/mtk_rpmsg.h               |  30 +
 17 files changed, 1614 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/remoteproc/mtk,scp.txt
 create mode 100644 drivers/remoteproc/mtk_common.h
 create mode 100644 drivers/remoteproc/mtk_scp.c
 create mode 100644 drivers/remoteproc/mtk_scp_ipi.c
 create mode 100644 drivers/rpmsg/mtk_rpmsg.c
 create mode 100644 include/linux/platform_data/mtk_scp.h
 create mode 100644 include/linux/rpmsg/mtk_rpmsg.h

-- 
2.22.0.rc1.257.g3120a18244-goog