Hello all, This series adds support for the Microchip Inter-Processor Communication (IPC) mailbox driver. I am submitting this v2 with the IPC mailbox patches and without the IPC remoteproc drivers, as suggested in v1 [1]. 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 [2]. [1] https://patchwork.kernel.org/project/linux-remoteproc/cover/20240912170025.455167-1-valentina.fernandezalanis@xxxxxxxxxxxxx/ [2] https://patchwork.kernel.org/project/linux-riscv/patch/20240725121609.13101-18-pierre-henry.moussay@xxxxxxxxxxxxx/ changes since v1: - 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 (3): riscv: sbi: vendorid_list: Add Microchip Technology to the vendor list dt-bindings: mailbox: add binding for Microchip IPC mailbox controller mailbox: add Microchip IPC support .../bindings/mailbox/microchip,sbi-ipc.yaml | 108 ++++ arch/riscv/include/asm/vendorid_list.h | 1 + drivers/mailbox/Kconfig | 13 + drivers/mailbox/Makefile | 2 + drivers/mailbox/mailbox-mchp-ipc-sbi.c | 537 ++++++++++++++++++ include/linux/mailbox/mchp-ipc.h | 23 + 6 files changed, 684 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
