Adds support for beagleplay cc1352 co-processor firmware upgrade using kernel Firmware Upload API. Uses ROM based bootloader present in cc13x2x7 and cc26x2x7 platforms for flashing over UART. Communication with the bootloader can be moved out of gb-beagleplay driver if required, but I am keeping it here since there are no immediate plans to use the on-board cc1352p7 for anything other than greybus (BeagleConnect Technology). Additionally, there do not seem to any other devices using cc1352p7 or its cousins as a co-processor. Bootloader backdoor and reset GPIOs are used to enable cc1352p7 bootloader backdoor for flashing. Flashing is skipped in case we are trying to flash the same image as the one that is currently present. This is determined by CRC32 calculation of the supplied firmware and flash data. We also do a CRC32 check after flashing to ensure that the firmware was flashed properly. Link: https://www.ti.com/lit/ug/swcu192/swcu192.pdf Ti CC1352P7 Technical Specification Changes in v4: - Add acks properly - Fix Kconfig warning by adding select FW_LOADER - Link to v3: https://lore.kernel.org/r/20240825-beagleplay_fw_upgrade-v3-0-8f424a9de9f6@xxxxxxxxxxxxxxx Changes in v3: - Spelling fixes in cover letter - Add Ack by Rob Herring on Patch 1 - Link to v2: https://lore.kernel.org/r/20240801-beagleplay_fw_upgrade-v2-0-e36928b792db@xxxxxxxxxxxxxxx Changes in v2: - Spelling fixes - Rename boot-gpios to bootloader-backdoor-gpios - Add doc comments - Add check to ensure firmware size is 704 KB - Link to v1: https://lore.kernel.org/all/20240719-beagleplay_fw_upgrade-v1-0-8664d4513252@xxxxxxxxxxxxxxx Signed-off-by: Ayush Singh <ayush@xxxxxxxxxxxxxxx> --- Ayush Singh (3): dt-bindings: net: ti,cc1352p7: Add bootloader-backdoor-gpios arm64: dts: ti: k3-am625-beagleplay: Add bootloader-backdoor-gpios to cc1352p7 greybus: gb-beagleplay: Add firmware upload API .../devicetree/bindings/net/ti,cc1352p7.yaml | 7 + arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts | 3 +- drivers/greybus/Kconfig | 2 + drivers/greybus/gb-beagleplay.c | 658 ++++++++++++++++++++- 4 files changed, 656 insertions(+), 14 deletions(-) --- base-commit: f76698bd9a8ca01d3581236082d786e9a6b72bb7 change-id: 20240715-beagleplay_fw_upgrade-43e6cceb0d3d Best regards, -- Ayush Singh <ayush@xxxxxxxxxxxxxxx>
