x86 platform clock controllers for Intel Atom, AMD FCH, and MaxLinear Lightning Mountain
A small collection of clock controller drivers for x86 system-on-chip platforms: Intel's Bay Trail and Cherry Trail Atom chips from roughly 2013 to 2016 (used in budget tablets, netbooks, and embedded boards), AMD's Fusion Controller Hub southbridge, and MaxLinear's Lightning Mountain (formerly Intel) AnyWAN gateway processors used in DSL and fiber home networking equipment.
recommendation
Worth keeping but documenting its mixed nature, because while the Bay Trail and Cherry Trail pieces target hardware Intel itself lists as former products, the Lightning Mountain portion is still under active development (a 2026 P-state enablement series is in flight) and MaxLinear continues to ship new AnyWAN gateway SoCs that depend on it. Both the AMD FCH and Lightning Mountain files received real maintenance work in 2023, so the directory is not abandoned even if much of it serves legacy systems.
repository signals
sources
- lore.kernel.org
`clk-lgm.c` received a real functional fix for MaxLinear/Lightning Mountain clocks that was backported to stable in 2023, indicating maintained upstream interest rather than abandonment.
- lore.kernel.org
`clk-fch.c` was still being touched in 2023 during clock-framework API churn, so the directory is not completely inert.
- spinics.net
A March 6, 2026 patch series adds P-state support for Intel/MaxLinear Lightning Mountain, which is evidence that at least one SoC family covered by this directory remains in active enablement.
- maxlinear.com
MaxLinear still markets active x86-based AnyWAN gateway SoCs in 2026, supporting the view that this class of embedded x86 networking hardware is still sold in niche new deployments.
- intel.com
Bay Trail is explicitly listed by Intel as a former product family with launches in 2013-2016, showing that part of this directory targets legacy hardware.
- intel.com
Cherry Trail is also explicitly a former Intel family, reinforcing that some drivers here serve older tablet/embedded Atom platforms rather than current mainstream systems.
codex reasoning notes (technical)
Local `rg`/`sed` inspection showed this directory is a real mixed hardware-driver bucket: `clk-lgm.c` (MaxLinear/Lightning Mountain), `clk-pmc-atom.c`/`clk-lpss-atom.c` (Bay/Cherry Trail era Intel Atom), and `clk-fch.c` (AMD FCH). `lore_activity` on `clk-lgm.c` produced the cited 2023 stable fix URL; `lore_activity` on `clk-fch.c` produced the cited 2023 linux-clk API-conversion URL. Web search produced the Spinics Lightning Mountain 2026 enablement thread and the MaxLinear/Intel product pages. Net: no solid removal evidence, one supported subfamily still appears alive, but deployments are niche and much of the directory is legacy, so keep it with annotation rather than deprecate/remove.