Month: 2025-10 Concise monthly summary focusing on key accomplishments for Zephyr SPI work on Renesas platforms.

September 2025 highlights across Zephyr Renesas work. Key features delivered include GTM Interrupt Interface Standardization, cross-platform DMA support, and enabling Zephyr MMU management where appropriate. In the halRenesas and Zephyr core, the focus was on unifying driver interfaces, extending DMA capabilities across Renesas RZ platforms, and ensuring memory protection and alignment with Zephyr MMU expectations. This work reduces platform divergence, accelerates onboarding of Renesas boards, and improves system performance and reliability. Key achievements include: - GTM Interrupt Interface Standardization: Standardize the GTM ISR prototype across Renesas RZ families to match the RZA-FSP, enabling a unified GTM FSP driver interface and generic Zephyr Counter/System Timer drivers. - DMA support across Renesas RZ platforms: Add DMA support for RZ/V, RZ/A, RZ/T, and RZ/N series with DMAC driver/HAL integration, plus a build cast safety fix in the DMAC FSP. - Enable Zephyr MMU management on RZ/A3UL: Disable BSP_FEATURE_BSP_HAS_MMU_SUPPORT to let Zephyr manage the MMU and update related docs. - Renesas DMA Controller support across RZ series in Zephyr: Unified DMA controller support across RZ/V2L, A3UL, T2M, N2L with core driver changes, device tree bindings, YAML board configurations, and test overlays.

August 2025 performance summary: Delivered cross-Renesas counter support and strengthened testing for Zephyr real-time OS. Key accomplishments include enabling the Renesas Counter Driver across RZ/V2L and RZ/A3UL (ISR improvements, overlays, and board configurations) and introducing GTM Counter support via device tree to recognize and enable hardware counter capabilities. Also hardened counter tests to handle very short timer ticks to improve reliability and prevent zero tick_us issues. In zephyr-testing, added Renesas RZ CMTW counter driver support for RZ/T2M and RZ/N2L with device-tree bindings, board configurations to enable the counter peripheral, and comprehensive testing overlays/samples to validate the counter driver across Renesas platforms. These efforts collectively improve reliability, testability, and deployment readiness of counter peripherals, enabling faster integration on target products and more accurate performance measurements across platforms.

July 2025: Zephyr HAL for Renesas – key refinements and platform enablement. Delivered clarity improvements in the Renesas RZG-FSP driver by renaming GPT capture ISRs for capture compare events, and added initial PWM support for the RZ/A series via MTU FSP HAL, enabling broader real-time control on this platform. These changes enhance maintainability, readability, and platform readiness, establishing groundwork for ongoing hardware peripheral support and future features.

June 2025 monthly summary focusing on PWM support for RZ/V on Zephyr HAL Renesas. Delivered a platform feature with potential to unlock PWM-based applications (motor control, signal generation) on RZ/V devices; staged for broad engineering and customer adoption.

May 2025 monthly summary: Focused on expanding Renesas RZ/V2N support across AmbiqZephyr and HAL, enabling developers to begin software work on new hardware and reducing time-to-prototype. The work delivered this month spans new SoC support, device trees, minimal board configuration, and HAL scaffolding, aligning with business goals of broader hardware coverage and faster time-to-value for new platforms. Key features delivered: - AmbiqZephyr: Renesas RZ/V2N SoC support established with configuration files, build system integration, and basic system initialization. - AmbiqZephyr: RZ/V2N device tree support added to recognize and configure CPU, memory, and serial interfaces. - AmbiqZephyr: Minimal RZ/V2N-EVK board support added (configs, device tree, and docs). - zephyrproject-rtos/hal_renesas: Initial HAL support scaffolding for Renesas RZ/V2N (peripheral headers and configuration groundwork).

Concise monthly summary for 2025-02 focusing on HAL Renesas work in zephyrproject-rtos/hal_renesas. Delivered foundational features across UART, ICU, PINCTRL/GPIO, and platform-wide RZ/T2L support, setting the stage for driver-level implementations and broader Renesas support.

December 2024 monthly summary for zephyrproject-rtos/hal_renesas: Delivered initial groundwork for Renesas RZ/T MCU Family hardware support, laying the foundation for peripheral usage across GPT, SCI, SPI, CANFD, CMT, WDT, IIC, DOC, ADC121, TSU, POEG1, ICU, GMAC, and PORT. This work enables downstream peripheral drivers, tests, and integration next sprint. The commit 2f4749787ad2d9e428bfb94e64ea2d1ee226d4b6 ("hal: renesas: rz: Add initial support for RZ/T") anchors the milestone and aligns with roadmap to broaden platform coverage and accelerate time-to-market for Renesas-based devices.