[RFC,0/8] Linux SBI MPXY and RPMI drivers

Message

Anup Patel Dec. 16, 2024, 8:48 a.m. UTC

The SBI v3.0 MPXY extension [1] and RPMI v1.0 [2] specifications are
in stable state and under ARC review at the RISC-V International so
as part of the RVI process we would like to receive an early feedback
on the device tree bindings and mailbox drivers hence this series.

Currently, most of the RPMI and MPXY drivers are in OpenSBI whereas
for Linux only has SBI MPXY mailbox controller driver and RPMI clock
driver. This series will be expanded in the future to include some
more RPMI drivers and ACPI support.

These patches can be found in the riscv_sbi_mpxy_mailbox_v1 branch at:
https://github.com/avpatel/linux.git

To test these patches, boot Linux on "virt,rpmi=on" machine with
latest OpenSBI and QEMU from the dev-upstream QEMU branch at:
https://github.com/ventanamicro/qemu.git

[1] https://github.com/riscv-non-isa/riscv-sbi-doc/releases
[2] https://github.com/riscv-non-isa/riscv-rpmi/releases

Anup Patel (7):
  riscv: Add new error codes defined by SBI v3.0
  dt-bindings: mailbox: Add bindings for RPMI shared memory transport
  dt-bindings: mailbox: Add bindings for RISC-V SBI MPXY extension
  RISC-V: Add defines for the SBI message proxy extension
  mailbox: Add common header for RPMI messages sent via mailbox
  mailbox: Add RISC-V SBI message proxy (MPXY) based mailbox driver
  dt-bindings: clock: Add bindings for RISC-V RPMI clock service group

Rahul Pathak (1):
  clk: Add clock driver for the RISC-V RPMI clock service group

 .../bindings/clock/riscv,rpmi-clock.yaml      |  78 ++
 .../mailbox/riscv,rpmi-shmem-mbox.yaml        | 135 +++
 .../bindings/mailbox/riscv,sbi-mpxy-mbox.yaml |  54 +
 arch/riscv/include/asm/sbi.h                  |  69 ++
 drivers/clk/Kconfig                           |   8 +
 drivers/clk/Makefile                          |   1 +
 drivers/clk/clk-rpmi.c                        | 588 +++++++++++
 drivers/mailbox/Kconfig                       |  11 +
 drivers/mailbox/Makefile                      |   2 +
 drivers/mailbox/riscv-sbi-mpxy-mbox.c         | 979 ++++++++++++++++++
 include/linux/mailbox/riscv-rpmi-message.h    | 218 ++++
 11 files changed, 2143 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/riscv,rpmi-clock.yaml
 create mode 100644 Documentation/devicetree/bindings/mailbox/riscv,rpmi-shmem-mbox.yaml
 create mode 100644 Documentation/devicetree/bindings/mailbox/riscv,sbi-mpxy-mbox.yaml
 create mode 100644 drivers/clk/clk-rpmi.c
 create mode 100644 drivers/mailbox/riscv-sbi-mpxy-mbox.c
 create mode 100644 include/linux/mailbox/riscv-rpmi-message.h