Hello all, This series adds support for the Microchip Inter-Processor Communication (IPC) mailbox driver. Microchip's family of RISC-V SoCs typically has one or more clusters that can be configured to run in Asymmetric Multi-Processing (AMP) mode. The Microchip IPC is used to send messages between processors using an interrupt signaling mechanism. The driver uses the RISC-V Supervisor Binary Interface (SBI) to communicate with software running in machine mode (M-mode) to access the IPC hardware block. Additional details on the Microchip vendor extension and the IPC function IDs described in the driver can be found in the following documentation: https://github.com/linux4microchip/microchip-sbi-ecall-extension The PIC64GX MPU has a Mi-V IHC block, this will be added to the PIC64GX dts after the initial upstreaming [1]. [1] https://patchwork.kernel.org/project/linux-riscv/patch/20240725121609.13101-18-pierre-henry.moussay@xxxxxxxxxxxxx/ Changes in v3: - Fix incorrent formatting around '=' in dt binding examples - Add per compatible descriptions in dt binding - Add '>' in certain dt binding descriptions to keep paragraphs maintained - export __cpuid_to_hartid_map to compile mailbox driver as module - Drop unused enum ipc_irq_type - rename struct mchp_ipc_probe to mchp_ipc_mbox_info - rename struct ipc_chan_info to mchp_ipc_sbi_chan - rename struct microchip_ipc to mchp_ipc_sbi_mbox - use phys_addr_t for __pa() - drop mchp_ipc_get_chan_id function - use num_chans in mbox_controller - Fix buf_base_tx and buf_base_rx sizes using max and kmalloc Changes in v2: - use kmalloc and __pa() instead of DMA API - fix size of buf_base to avoid potential buffer overflow - add kernel doc for exported functions (mchp_ipc_get_chan_id) - use EXPORT_SYMBOL_GPL instead of EXPORT_SYMBOL - drop unnecessary blank line and fix alignment issues - drop of_match_ptr - move MODULE_DEVICE_TABLE next to the definition - reword subject from riscv: asm: vendorid_list to riscv: sbi: vendorid_list - remove the word "driver" from dt-binding commit subject - make interrupt-names a required property for all cases - add dependency on COMPILE_TEST and ARCH_MICROCHIP Regards, Valentina Valentina Fernandez (4): riscv: sbi: vendorid_list: Add Microchip Technology to the vendor list riscv: export __cpuid_to_hartid_map dt-bindings: mailbox: add binding for Microchip IPC mailbox controller mailbox: add Microchip IPC support .../bindings/mailbox/microchip,sbi-ipc.yaml | 117 ++++ arch/riscv/include/asm/vendorid_list.h | 1 + arch/riscv/kernel/smp.c | 1 + drivers/mailbox/Kconfig | 13 + drivers/mailbox/Makefile | 2 + drivers/mailbox/mailbox-mchp-ipc-sbi.c | 504 ++++++++++++++++++ include/linux/mailbox/mchp-ipc.h | 33 ++ 7 files changed, 671 insertions(+) create mode 100644 Documentation/devicetree/bindings/mailbox/microchip,sbi-ipc.yaml create mode 100644 drivers/mailbox/mailbox-mchp-ipc-sbi.c create mode 100644 include/linux/mailbox/mchp-ipc.h -- 2.34.1
