Hi, This series adds support for the new ARM Message Handling Unit v3 mailbox controller [1]. The ARM MHUv3 can optionally support various extensions, enabling the usage of different transport protocols. Patch [2/2] adds a platform driver which, as of now, provides support only for the Doorbell extension using the combined interrupt. On the other side, bindings in [1/2] are introduced for all the extensions described by the specification, as long as they are of interest to an entity running from Normal world, like Linux: as such, Doorbell, FIFO and FastChannel extensions are documented. In these regards, note that the ARM MHUv3 controller can optionally implement a considerable number of interrupts to express a great deal of events and many of such interrupts are defined as being per-channel: with the total maximum amount of possibly implemented channels across all extensions being 1216 (1024+128+64), it would mean *a lot* of interrupt-names to enumerate in the bindings. For the sake of simplicity the binding as of now only introduces interrupt names for a mere 8-channels in the range (0,7) for each per-channel interrupt type: the idea is to leave open the possibility to add more to this list of numbered items only when (and if) new real HW appears that effectively needs more than 8 channels. (like AMBA, where the maximum number of IRQ was progressively increased when needed, AFAIU). Based on v6.9-rc1, tested on ARM TCS23 [2] (TCS23 reference SW stack is still to be made fully publicly available) Thanks, Cristian [1]: https://developer.arm.com/documentation/aes0072/aa/?lang=en [2]: https://community.arm.com/arm-community-blogs/b/tools-software-ides-blog/posts/total-compute-solutions-platform-software-stack-and-fvp --- v3 -> v4 - avoid magic numbers for regs padding holes - renaming various enums terminators to count_ instead of max_ - using scoped_guards for spinlock_save - dropping FIRST_EXT naming for 0-indexed enum - reduce indentation by using early returns or continue on failure-paths - use dev_err_probe where appropriate - be less noisy with dev_dbg - refactored mhuv3_mbx_comb_interrupt using __free cleanups for .read_data - refactored doorbell lookups with scoped_guards - fail on IRQ request failures: do not carry-on best effort - drop usage of platform_set_drvdata and .remove in favour of devm_add_action_or_reset - review failures handling on extensions initialization - removed name clashes - more comments on regs decorations - decreasing line-lengths definitions - use __ffs instead of __builtin_ctz - dropped used of bitfields in favour of bitmasks - reading implementer/revision/variant/product_id - fixed a few misspellings - DT: using ARM GIC defines in example - DT: defined MHUv3 Extensions types in new file dt-bindings/arm/mhuv3-dt.h v2 -> v3 - fixed spurious tabs/spaces in DT binding v1 -> v2 - clarified DT bindings extension descriptions around configurability and discoverability - removed unused labels from the DT example - using pattern properties to define DT interrupt-names - bumped DT interrupt maxItems to 74 (allowing uo to 8 channels per extension) - fixed checkpatch warnings about side-effects on write/read bitfield macros - fixed sparse errors as reported | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202403290015.tCLXudqC-lkp@xxxxxxxxx/ Cristian Marussi (2): dt-bindings: mailbox: arm,mhuv3: Add bindings mailbox: arm_mhuv3: Add driver .../bindings/mailbox/arm,mhuv3.yaml | 224 ++++ MAINTAINERS | 9 + drivers/mailbox/Kconfig | 11 + drivers/mailbox/Makefile | 2 + drivers/mailbox/arm_mhuv3.c | 1102 +++++++++++++++++ include/dt-bindings/arm/mhuv3-dt.h | 13 + 6 files changed, 1361 insertions(+) create mode 100644 Documentation/devicetree/bindings/mailbox/arm,mhuv3.yaml create mode 100644 drivers/mailbox/arm_mhuv3.c create mode 100644 include/dt-bindings/arm/mhuv3-dt.h -- 2.34.1
