drivers/base/power/clock_ops.c

File Facts

System

Linux kernel

Corpus path

drivers/base/power/clock_ops.c

Extension

.c

Size

18011 bytes

Lines

733

Domain

Driver Families

Bucket

drivers/base

Inferred role

Driver Families: operation-table or driver-model contract

Status

pattern implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

• Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
• Defines an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/kernel.h
• linux/device.h
• linux/io.h
• linux/pm.h
• linux/pm_clock.h
• linux/clk.h
• linux/clkdev.h
• linux/of_clk.h
• linux/slab.h
• linux/err.h
• linux/pm_domain.h
• linux/pm_runtime.h

Detected Declarations

• struct pm_clock_entry
• enum pce_status
• function pm_clk_suspend
• function pm_clk_list_lock
• function pm_clk_op_lock
• function __pm_clk_enable
• function pm_clk_acquire
• function __pm_clk_add
• function pm_clk_add
• function clk_put
• function of_pm_clk_add_clks
• function __pm_clk_remove
• function pm_clk_remove_clk
• function list_for_each_entry
• function pm_clk_init
• function pm_clk_create
• function pm_clk_destroy
• function list_for_each_entry_safe_reverse
• function pm_clk_destroy_action
• function devm_pm_clk_create
• function pm_clk_suspend
• function list_for_each_entry_reverse
• function pm_clk_resume
• function pm_clk_notify
• function pm_clk_runtime_suspend
• function pm_clk_runtime_resume
• function enable_clock
• function disable_clock
• function pm_clk_notify
• function pm_clk_notify
• export pm_clk_add
• export pm_clk_add_clk
• export of_pm_clk_add_clks
• export pm_clk_remove_clk
• export pm_clk_init
• export pm_clk_create
• export pm_clk_destroy
• export devm_pm_clk_create
• export pm_clk_suspend
• export pm_clk_resume
• export pm_clk_runtime_suspend
• export pm_clk_runtime_resume
• export pm_clk_add_notifier

Annotated Snippet

void pm_clk_add_notifier(const struct bus_type *bus,
				 struct pm_clk_notifier_block *clknb)
{
	if (!bus || !clknb)
		return;

	clknb->nb.notifier_call = pm_clk_notify;
	bus_register_notifier(bus, &clknb->nb);
}
EXPORT_SYMBOL_GPL(pm_clk_add_notifier);

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/device.h`, `linux/io.h`, `linux/pm.h`, `linux/pm_clock.h`, `linux/clk.h`, `linux/clkdev.h`, `linux/of_clk.h`.
• Detected declarations: `struct pm_clock_entry`, `enum pce_status`, `function pm_clk_suspend`, `function pm_clk_list_lock`, `function pm_clk_op_lock`, `function __pm_clk_enable`, `function pm_clk_acquire`, `function __pm_clk_add`, `function pm_clk_add`, `function clk_put`.
• Atlas domain: Driver Families / drivers/base.
• Implementation status: pattern implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.