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Linus Torvalds 13c916af3a Not much changed in the clk framework this time except the clk.h consumer API
moved the context saving APIs around to fix a build error in certain
 configurations. There was a change to the core framework for
 CLK_OPS_PARENT_ENABLE behavior during registration, but it wrecked existing
 drivers that didn't expect things to be turned off during clk registration so
 it got reverted.
 
 This cycle is really a large collection of new clk drivers, primarily for
 Qualcomm SoCs but also for Amlogic, SpacemiT, Google, and Aspeed. Another big
 change in here is support for automatic hardware clock gating on Samsung SoCs
 where the clks turn on and off when needed. Ideally more vendors move to this
 method for better power savings. The highlights are in the updates section
 below.
 
 Beyond all the new drivers we have a bunch of cleanups like converting drivers
 from divider_round_rate() to divider_determine_rate() and using scoped for each
 OF child loops. Otherwise it's the usual data fixes and plugging reference
 leaks, etc. that's all pretty ordinary but not critical enough to fix until the
 next release.
 
 New Drivers:
  - Qualcomm Kaanapali global, tcsr, rpmh, display, gpu, camera, and video clk
    controllers
  - Qualcomm SM8750 camera clk controllers
  - Qualcomm MSM8940 and SDM439 global clk controllers
  - Google GS101 Display Process Unit (DPU) clk controllers
  - SpacemiT K3 clk controllers
  - Amlogic t7 clk controllers
  - Aspeed AST2700 clk controllers
 
 Updates:
  - Convert clock dividers from round_rate() to determine_rate()
  - Fix sparse warnings, kernel-doc warnings, and plug leaked OF refs
  - Automatic hardware clk gating on Google GS101 SoCs
  - Amlogic s4 video clks
  - CAN-FD clks and resets on Renesas RZ/T2H, RZ/N2H, RZ/V2H, and RZ/V2N
  - Expanded Serial Peripheral Interface (xSPI) clocks and resets on Renesas
    RZ/T21H and RZ/N2H
  - DMAC, interrupt controller (ICU), SPI, and thermal (TSU) clocks and resets
    on Renesas RZ/V2N
  - More serial (RSCI) clocks and resets on Renesas RZ/V2H and RZ/V2N
  - CPU frequency scaling on T-HEAD TH1520
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Merge tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux

Pull clk updates from Stephen Boyd:
 "Not much changed in the clk framework this time except the clk.h
  consumer API moved the context saving APIs around to fix a build error
  in certain configurations.

  There was a change to the core framework for CLK_OPS_PARENT_ENABLE
  behavior during registration, but it wrecked existing drivers that
  didn't expect things to be turned off during clk registration so it
  got reverted.

  This cycle is really a large collection of new clk drivers, primarily
  for Qualcomm SoCs but also for Amlogic, SpacemiT, Google, and Aspeed.
  Another big change in here is support for automatic hardware clock
  gating on Samsung SoCs where the clks turn on and off when needed.
  Ideally more vendors move to this method for better power savings. The
  highlights are in the updates section below.

  Beyond all the new drivers we have a bunch of cleanups like converting
  drivers from divider_round_rate() to divider_determine_rate() and
  using scoped for each OF child loops. Otherwise it's the usual data
  fixes and plugging reference leaks, etc. that's all pretty ordinary
  but not critical enough to fix until the next release.

  New Drivers:
   - Qualcomm Kaanapali global, tcsr, rpmh, display, gpu, camera, and
     video clk controllers
   - Qualcomm SM8750 camera clk controllers
   - Qualcomm MSM8940 and SDM439 global clk controllers
   - Google GS101 Display Process Unit (DPU) clk controllers
   - SpacemiT K3 clk controllers
   - Amlogic t7 clk controllers
   - Aspeed AST2700 clk controllers

  Updates:
   - Convert clock dividers from round_rate() to determine_rate()
   - Fix sparse warnings, kernel-doc warnings, and plug leaked OF refs
   - Automatic hardware clk gating on Google GS101 SoCs
   - Amlogic s4 video clks
   - CAN-FD clks and resets on Renesas RZ/T2H, RZ/N2H, RZ/V2H, and
     RZ/V2N
   - Expanded Serial Peripheral Interface (xSPI) clocks and resets on
     Renesas RZ/T21H and RZ/N2H
   - DMAC, interrupt controller (ICU), SPI, and thermal (TSU) clocks and
     resets on Renesas RZ/V2N
   - More serial (RSCI) clocks and resets on Renesas RZ/V2H and RZ/V2N
   - CPU frequency scaling on T-HEAD TH1520"

* tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (165 commits)
  clk: aspeed: Add reset for HACE/VIDEO
  dt-bindings: clock: aspeed: Add VIDEO reset definition
  clk: aspeed: add AST2700 clock driver
  MAINTAINERS: Add entry for ASPEED clock drivers.
  clk: aspeed: Move the existing ASPEED clk drivers into aspeed subdirectory.
  Revert "clk: Respect CLK_OPS_PARENT_ENABLE during recalc"
  clk: Disable KUNIT_UML_PCI
  dt-bindings: clk: rs9: Fix DIF pattern match
  clk: rs9: Convert to DEFINE_SIMPLE_DEV_PM_OPS()
  clk: rs9: Reserve 8 struct clk_hw slots for for 9FGV0841
  clk: qcom: sm8750: Constify 'qcom_cc_desc' in SM8750 camcc
  clk: zynqmp: pll: Fix zynqmp_clk_divider_determine_rate kerneldoc
  clk: zynqmp: divider: Fix zynqmp_clk_divider_determine_rate kerneldoc
  clk: mediatek: Fix error handling in runtime PM setup
  clk: mediatek: don't select clk-mt8192 for all ARM64 builds
  clk: mediatek: Add mfg_eb as parent to mt8196 mfgpll clocks
  clk: mediatek: Refactor pllfh registration to pass device
  clk: mediatek: Pass device to clk_hw_register for PLLs
  clk: mediatek: Refactor pll registration to pass device
  clk: Respect CLK_OPS_PARENT_ENABLE during recalc
  ...
2026-02-15 08:18:57 -08:00
arch LoongArch changes for v7.0 2026-02-14 12:47:15 -08:00
block mm.git review status for linus..mm-stable 2026-02-12 11:32:37 -08:00
certs mm.git review status for linus..mm-nonmm-stable 2026-02-12 12:13:01 -08:00
crypto mm.git review status for linus..mm-nonmm-stable 2026-02-12 12:13:01 -08:00
Documentation Not much changed in the clk framework this time except the clk.h consumer API 2026-02-15 08:18:57 -08:00
drivers Not much changed in the clk framework this time except the clk.h consumer API 2026-02-15 08:18:57 -08:00
fs Description for this pull request: 2026-02-14 10:50:31 -08:00
include Not much changed in the clk framework this time except the clk.h consumer API 2026-02-15 08:18:57 -08:00
init mm.git review status for linus..mm-nonmm-stable 2026-02-12 12:13:01 -08:00
io_uring for-7.0/io_uring-zcrx-large-buffers-20260206 2026-02-12 15:07:50 -08:00
ipc mm.git review status for linus..mm-nonmm-stable 2026-02-12 12:13:01 -08:00
kernel printk, vt, fbcon: Remove console_conditional_schedule() 2026-02-14 11:09:47 +01:00
lib Bootconfig for v7.0 2026-02-13 19:33:39 -08:00
LICENSES LICENSES: Add modern form of the LGPL-2.1 tags to the usage guide section 2025-10-22 07:58:19 +02:00
mm memblock: updates for 7.0-rc1 2026-02-14 12:39:34 -08:00
net virtio,vhost,vdpa: features, fixes 2026-02-13 12:02:18 -08:00
rust configfs changes for v7.0 2026-02-12 14:01:38 -08:00
samples configfs changes for v7.0 2026-02-12 14:01:38 -08:00
scripts virtio,vhost,vdpa: features, fixes 2026-02-13 12:02:18 -08:00
security Capabilities update for 7.0 2026-02-14 11:30:05 -08:00
sound mm.git review status for linus..mm-nonmm-stable 2026-02-12 12:13:01 -08:00
tools LoongArch changes for v7.0 2026-02-14 12:47:15 -08:00
usr kbuild: uapi: drop dependency on CC_CAN_LINK 2026-01-16 15:02:11 -07:00
virt Merge tag 'kvm-x86-pmu-6.20' of https://github.com/kvm-x86/linux into HEAD 2026-02-11 12:45:40 -05:00
.clang-format Devicetree updates for v7.0: 2026-02-11 18:27:08 -08:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.cocciconfig
.editorconfig editorconfig: add rst extension 2026-01-26 19:07:09 -08:00
.get_maintainer.ignore MAINTAINERS: remove Alyssa Rosenzweig 2025-09-18 21:17:31 +02:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore rust: kbuild: add proc macro library support 2025-11-24 17:15:36 +01:00
.mailmap Landlock update for v7.0-rc1 2026-02-11 15:57:08 -08:00
.pylintrc docs: Move the python libraries to tools/lib/python 2025-11-18 09:22:40 -07:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS Networking changes for 7.0 2026-02-11 19:31:52 -08:00
Kbuild sched: Make migrate_{en,dis}able() inline 2025-09-25 09:57:16 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS Not much changed in the clk framework this time except the clk.h consumer API 2026-02-15 08:18:57 -08:00
Makefile Devicetree updates for v7.0: 2026-02-11 18:27:08 -08:00
README docs: add AI Coding Assistants documentation 2026-01-06 14:55:06 -07:00

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