[PATCH v3 0/4] Obtain SMBIOS and ACPI entry from FFI

[Yunhui Cui]

Here's version 3 of patch series.

V1: The FFI (FDT FIRMWARE INTERFACE) scheme has reached a
consensus with the Maintainers.
Please refer to:
https://patches.linaro.org/project/linux-acpi/patch/20230426034001.16-1-cuiyunhui@bytedance.com/

Changes v1->v2:
Adjusted the code structure, put the ACPI part under the RISC-V architecture,
and put the general part of obtaining SMBIOS entry through FFI
under driver/firmware/.
Please refer to:
https://lore.kernel.org/lkml/20230703-71f67eb66a037f5c0fb825c6@orel/T/

Changes v2->v3: 
According to the suggestions of maintainers, the code has been modified as follows:
1. Modified the commit log.
2. Added description of "ffitbl" subnod in dt-bindings.
3. Add stub function to the function
4. arch/riscv/ and driver/firmware/ use CONFIG_FDT_FW_INTERFACE to control
5. Modified the ffi_smbios_root_pointer() function logic and printing
etc.

Yunhui Cui (4):
  riscv: obtain ACPI RSDP from devicetree
  firmware: introduce FFI for SMBIOS entry
  riscv: obtain SMBIOS entry from FFI
  dt-bindings: firmware: Document ffitbl binding

 .../devicetree/bindings/firmware/ffitbl.txt   | 27 ++++++
 MAINTAINERS                                   | 13 +++
 arch/riscv/include/asm/acpi.h                 |  9 ++
 arch/riscv/include/asm/ffi.h                  | 14 +++
 arch/riscv/kernel/Makefile                    |  1 +
 arch/riscv/kernel/ffi.c                       | 40 ++++++++
 arch/riscv/kernel/setup.c                     |  2 +
 drivers/firmware/Kconfig                      | 11 +++
 drivers/firmware/Makefile                     |  1 +
 drivers/firmware/dmi_scan.c                   | 97 +++++++++++--------
 drivers/firmware/ffi.c                        | 42 ++++++++
 include/linux/ffi.h                           | 29 ++++++
 12 files changed, 246 insertions(+), 40 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/firmware/ffitbl.txt
 create mode 100644 arch/riscv/include/asm/ffi.h
 create mode 100644 arch/riscv/kernel/ffi.c
 create mode 100644 drivers/firmware/ffi.c
 create mode 100644 include/linux/ffi.h

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2.20.1