April 2026 monthly summary for nxp-upstream/zephyr focusing on power management and shell responsiveness improvements. Key features delivered and bugs fixed, with emphasis on business value and reliability. Commit reference 923d70987fba37e68b4e8071e12ee35600231168.

March 2026 monthly summary for nxp-upstream/zephyr. Focused on stabilizing power management RAM retention by aligning RAM sizing to API requirements, improving memory power-down behavior, and ensuring platform reliability for SiLabs Siwx91x integration.

December 2025 achievements in the nrfconnect/sdk-zephyr repository focused on SIWx platforms, delivering clock/timing accuracy, expanded test coverage, and streamlined power management. Key work includes hardware clock initialization via device tree, centralized system clock tick handling for sleeptimer, and correct timing cycle conversions to improve CPU tick benchmarking; fixes for missing ACMP clock definitions on xg21 to resolve compilation issues; extensive board overlays and peripheral configuration to enable testing across multiple SIWx boards (SPI loopback, I2S, PSRAM, ADC bindings, and PINCTRL/dtb improvements); and simplifications to power management including removal of an unused power profile property and ensuring Bluetooth TX power is set before power-saving requests. These changes reduce CI/build friction, improve reliability, and deliver measurable performance and power-management gains for SIWx workflows.

November 2025 monthly summary for nrfconnect/sdk-zephyr (SiWx91x SoCs): Delivered significant power management and runtime resource improvements across DMA, SPI, and I2S, including default clock control, preventing deep sleep during active peripherals, proper error handling, and asynchronous releases. Implemented zero-latency interrupt support and robust DMA interrupt handling to prevent missed interrupts. Refactored firmware version checks to remove sscanf, enabling compatibility with minimal C++ standard library and structured versioning. Fixed development-time issues: DT_SPI_DEV_HAS_CS_GPIOS macro corrected to restore proper cs-gpio validation; and updated DMA/power-domain test suite to validate suspend/restore semantics. Enabled clock control by default across SiWx91x SoCs, improving reliability and power efficiency. These changes collectively improve runtime reliability, reduce power consumption, enhance test stability, and simplify maintenance for the SiWx91x codepath.

Summary for 2025-10: This month focused on core reliability, cross-board maintainability, and energy-aware optimization for the Silabs SIWX91x platform in zephyr. Key features delivered include Network Co-Processor (NWP) integration with firmware version checks, a dedicated NWP driver, boot verification, and readiness checks, along with wake/sleep optimization through adjusted stack size and power behavior. Additional feature work modernized the Silabs ADC driver and broadened board support, unifying ADC Kconfig and removing the old IADC driver for maintainability. Major bug fixes addressed UART/DMA race conditions and DMA status reporting at high baud rates, improving reliability of serial paths and TX behavior. A PM-enabled DMA driver was added to support suspend/resume, aligning the DMA path with the project’s power management goals. Commits across these areas include, for example, the NWP-focused updates such as soc: silabs: siwx91x: Add firmware version check of NWP and the driver integration work, the Silabs ADC modernization commits, UART/DMA ISR ordering fixes, and the DMA PM enablement. Overall this work increases system reliability, cross-board consistency, and energy efficiency, enabling more robust wake/sleep cycles, easier maintenance, and improved UART throughput and DMA reliability in production scenarios.

September 2025 monthly summary for zephyrproject-rtos/zephyr: Highlights include new DHT sensor support on xg29_rb4412a, ADC sequence improvements with 64-bit millivolt conversions and oversampling, UART stability fixes to improve robustness when DMA is absent, and expanded test coverage for the xg29_rb4412a board in uart_elementary and SPI loopback tests. These changes improve hardware compatibility, measurement accuracy, and overall system reliability while reducing regression risk. Technologies demonstrated include device-tree aliasing and regulator usage, 64-bit arithmetic for conversions, oversampling configurations, differential mode handling, DMA-safe ISR, blocking poll semantics, and test overlays for board-specific tests.

August 2025: Delivered the Silabs IADC Series 2 driver across Zephyr boards with DMA support, delivering cross-board compatibility, binding updates, and DMA-enabled ADC operation. This work included pin allocation fixes, expanded board/test coverage, and new samples/overlays to simplify adoption and testing. The changes reduce configuration friction, improve data throughput, and enable efficient ADC usage across Silabs boards, accelerating integration for customers and internal teams.

July 2025 performance highlights across the nrfconnect/sdk-zephyr, zephyrproject-rtos/zephyr, and Zephyr4Microchip/zephyr repositories. Delivered high-impact features, stability improvements, and expanded hardware support that collectively reduce onboarding time, accelerate testing, and improve real-time performance for embedded projects. Focused on auto-detection workflows for flashing, board availability, DMA reliability, RAM-based ISR handling, and build stability.

June 2025: Focused on stabilizing core hardware driver behavior and improving device-tree clock configurations. Delivered a robust fix for the ns16550 Serial Driver clock subsystem when multiple UARTs share the driver, reducing initialization issues and inaccuracies in clock selection.

May 2025 monthly summary focused on delivering core platform capabilities, stabilizing memory and boot paths, and expanding hardware support across SiWx family. The work enhances value for WiseConnect-based deployments and Zephyr Silabs/Ambiq Zephyr integrations by enabling robust RTC/calendar, UART, and NWP-aware memory layouts, with improved testing coverage.

April 2025 monthly summary for AmbiqMicro/ambiqzephyr: Focused on configuration hygiene for the adi/max32 SOC by removing an unused Kconfig symbol (SRAM_VECTOR_TABLE). This cleanup clarifies the configuration space and prevents confusion with future definitions, while preserving existing functionality. The change is low risk and lays groundwork for clearer symbol management in future SOC variants.

February 2025 – Focused on elevating DMA reliability, performance, and cross-repo maintainability for Silabs across Zephyr and HAL. Delivered key LDMA enhancements in telink-semi/zephyr (P2M/M2P transfers with DTS signal bindings, dynamic block append, channel filtering/release, and a robust block-append test suite), plus build and HAL integration improvements (EMDRV/dmadrv, GECKO LDMA conditional builds). Addressed quality by silencing DMA warnings when asserts are disabled and enabling Zero Latency IRQ by default on silabs_s2. In hal_silabs, introduced DMADRV Allocate Channel By ID API and integrated DMADRV HAL via Simplicity SDK to standardize DMA usage and reduce integration risk. Overall impact: higher data throughput, safer DMA resource management, lower maintenance burden, and faster feature delivery for real-time peripherals.

January 2025: Delivered cross-series Silabs USART support and stability improvements in telink-semi/zephyr. Implemented a dedicated Series 2 and Series 0/1 USART driver path with per-series pin-ctrl and clock-ctrl, updated device-tree bindings, and build/config adjustments to accommodate the new driver. Fixed build-time dependency issues in the Silabs USART driver and restored proper power-management behavior for Gecko/USART, ensuring transmit FIFO is flushed before suspend. The work enhances hardware compatibility, reliability, and maintainability on Silabs-based platforms while improving build reliability and suspend/resume correctness.

December 2024 monthly summary: Delivered Silabs LDMA DMA support in Zephyr for Silicon Labs SoCs, establishing a complete DMA integration path from HAL configuration to device tree bindings, board overlays, and tests. The work enables reliable, high-throughput DMA transfers on Silabs platforms, reduces CPU load for data-intensive workloads, and provides a solid foundation for future DMA features across Silabs boards.