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The AC200 and AC300 contain compatible Fast Ethernet link PHYs, but the link endpoint is inaccessible until package-specific control registers have powered and configured it. Add one PHY driver which binds the link child and joins its parent Ethernet PHY package. Fixed package compatibles select the corresponding backend. The generic ACx00 compatible reads one packed configuration field and selects the backend before touching backend-specific resources. The AC300 path therefore does not resolve or access the candidate AC200 I2C device. Require two returned NVMEM bytes for AC300 and selectable ACx00 packages before selecting the backend. Keep the existing little-endian decoding and one-byte calibration support for fixed AC200 packages. AC200 locates the I2C device referenced by the package and establishes a managed device link. It verifies that the provider is fully bound under the supplier device lock before retrieving the regmap attached to the I2C device. The companion MFD provider enables and exclusively pins the input clock rate while it is bound. The link keeps the supplier bound until the PHY consumer has unbound. Firmware must make the selected AC200 provider path available before the PHY probes. AC300 uses the PHY package helpers to access the control range at base address plus 16. Keeping both backends in the same module lets the common link implementation own the complete PHY without registering artificial control devices. Obtain and manage the selected package supply and calibration, manage the AC300 input clock, validate or program the link address, and apply the required reset, clock, I/O and shutdown sequences. Start in the hardware-default MII mode so the forced PHY device can probe before a MAC attaches, then apply the MAC-provided MII or RMII mode before the normal PHY soft reset. AC200 specifies no additional delay between its EPHY controls; the provider's input-clock startup delay is already complete before its regmap becomes available. Apply the common vendor analog initialization, optional AC300 low-calibration tuning and board-selected receive-clock inversion. Keep MDI/MDI-X in automatic mode. Preserve standard MAC-managed EEE support while disabling the vendor PHY-autonomous Intelligent EEE mode. Restart autonegotiation when restoring the standard EEE advertisement changes it. Serialize package state and the multi-register power sequences across the different phylib callback lock contexts. Power down the package control block and its supply during PHY suspend, then restore them and the vendor configuration during resume. If shutdown fails after resetting the PHY, restore the vendor settings and standard advertisement or forced speed/duplex under the phylib lock before returning the original error. A failed suspend is not followed by a normal resume to restore these settings. Power down again if recovery fails, and unwind package power if reset, resume or configuration fails after power-on. Signed-off-by: James Hilliard <james.hilliard1@gmail.com> Link: https://patch.msgid.link/20260909-submit-acx00-of-dynamic-v1-v11-2-eb45e89ef918@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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Linux kernel ============ The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software. Quick Start ----------- * Report a bug: See Documentation/admin-guide/reporting-issues.rst * Get the latest kernel: https://kernel.org * Build the kernel: See Documentation/admin-guide/quickly-build-trimmed-linux.rst * Join the community: https://lore.kernel.org/ Essential Documentation ----------------------- All users should be familiar with: * Building requirements: Documentation/process/changes.rst * Code of Conduct: Documentation/process/code-of-conduct.rst * License: See COPYING Documentation can be built with make htmldocs or viewed online at: https://www.kernel.org/doc/html/latest/ Who Are You? ============ Find your role below: * New Kernel Developer: Getting started with kernel development * Academic Researcher: Studying kernel internals and architecture * Security Expert: Hardening and vulnerability analysis * Backport/Maintenance Engineer: Maintaining stable kernels * System Administrator: Configuring and troubleshooting * Maintainer: Leading subsystems and reviewing patches * Hardware Vendor: Writing drivers for new hardware * Distribution Maintainer: Packaging kernels for distros * AI Coding Assistant: LLMs and AI-powered development tools For Specific Users ================== New Kernel Developer -------------------- Welcome! Start your kernel development journey here: * Getting Started: Documentation/process/development-process.rst * Your First Patch: Documentation/process/submitting-patches.rst * Coding Style: Documentation/process/coding-style.rst * Build System: Documentation/kbuild/index.rst * Development Tools: Documentation/dev-tools/index.rst * Kernel Hacking Guide: Documentation/kernel-hacking/hacking.rst * Core APIs: Documentation/core-api/index.rst Academic Researcher ------------------- Explore the kernel's architecture and internals: * Researcher Guidelines: Documentation/process/researcher-guidelines.rst * Memory Management: Documentation/mm/index.rst * Scheduler: Documentation/scheduler/index.rst * Networking Stack: Documentation/networking/index.rst * Filesystems: Documentation/filesystems/index.rst * RCU (Read-Copy Update): Documentation/RCU/index.rst * Locking Primitives: Documentation/locking/index.rst * Power Management: Documentation/power/index.rst Security Expert --------------- Security documentation and hardening guides: * Security Documentation: Documentation/security/index.rst * LSM Development: Documentation/security/lsm-development.rst * Self Protection: Documentation/security/self-protection.rst * Reporting Vulnerabilities: Documentation/process/security-bugs.rst * CVE Procedures: Documentation/process/cve.rst * Embargoed Hardware Issues: Documentation/process/embargoed-hardware-issues.rst * Security Features: Documentation/userspace-api/seccomp_filter.rst Backport/Maintenance Engineer ----------------------------- Maintain and stabilize kernel versions: * Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst * Backporting Guide: Documentation/process/backporting.rst * Applying Patches: Documentation/process/applying-patches.rst * Subsystem Profile: Documentation/maintainer/maintainer-entry-profile.rst * Git for Maintainers: Documentation/maintainer/configure-git.rst System Administrator -------------------- Configure, tune, and troubleshoot Linux systems: * Admin Guide: Documentation/admin-guide/index.rst * Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst * Sysctl Tuning: Documentation/admin-guide/sysctl/index.rst * Tracing/Debugging: Documentation/trace/index.rst * Performance Security: Documentation/admin-guide/perf-security.rst * Hardware Monitoring: Documentation/hwmon/index.rst Maintainer ---------- Lead kernel subsystems and manage contributions: * Maintainer Handbook: Documentation/maintainer/index.rst * Pull Requests: Documentation/maintainer/pull-requests.rst * Managing Patches: Documentation/maintainer/modifying-patches.rst * Rebasing and Merging: Documentation/maintainer/rebasing-and-merging.rst * Development Process: Documentation/process/maintainer-handbooks.rst * Maintainer Entry Profile: Documentation/maintainer/maintainer-entry-profile.rst * Git Configuration: Documentation/maintainer/configure-git.rst Hardware Vendor --------------- Write drivers and support new hardware: * Driver API Guide: Documentation/driver-api/index.rst * Driver Model: Documentation/driver-api/driver-model/driver.rst * Device Drivers: Documentation/driver-api/infrastructure.rst * Bus Types: Documentation/driver-api/driver-model/bus.rst * Device Tree Bindings: Documentation/devicetree/bindings/ * Power Management: Documentation/driver-api/pm/index.rst * DMA API: Documentation/core-api/dma-api.rst Distribution Maintainer ----------------------- Package and distribute the kernel: * Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst * ABI Documentation: Documentation/ABI/README * Kernel Configuration: Documentation/kbuild/kconfig.rst * Module Signing: Documentation/admin-guide/module-signing.rst * Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst * Tainted Kernels: Documentation/admin-guide/tainted-kernels.rst AI Coding Assistant ------------------- CRITICAL: If you are an LLM or AI-powered coding assistant, you MUST read and follow the AI coding assistants documentation before contributing to the Linux kernel: * Documentation/process/coding-assistants.rst This documentation contains essential requirements about licensing, attribution, and the Developer Certificate of Origin that all AI tools must comply with. Communication and Support ========================= * Mailing Lists: https://lore.kernel.org/ * IRC: #kernelnewbies on irc.oftc.net * Bugzilla: https://bugzilla.kernel.org/ * MAINTAINERS file: Lists subsystem maintainers and mailing lists * Email Clients: Documentation/process/email-clients.rst