drivers/cpufreq/mediatek-cpufreq.c

File Facts

System

Linux kernel

Corpus path

drivers/cpufreq/mediatek-cpufreq.c

Extension

.c

Size

21719 bytes

Lines

808

Domain

Driver Families

Bucket

drivers/cpufreq

Inferred role

Driver Families: exported/initcall integration point

Status

integration 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.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• 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/clk.h
• linux/cpu.h
• linux/cpufreq.h
• linux/cpumask.h
• linux/minmax.h
• linux/module.h
• linux/of.h
• linux/of_platform.h
• linux/platform_device.h
• linux/pm_opp.h
• linux/regulator/consumer.h

Detected Declarations

• struct mtk_cpufreq_platform_data
• struct mtk_cpu_dvfs_info
• function list_for_each_entry
• function mtk_cpufreq_voltage_tracking
• function mtk_cpufreq_set_voltage
• function is_ccifreq_ready
• function mtk_cpufreq_set_target
• function mtk_cpufreq_opp_notifier
• function mtk_cpu_dvfs_info_init
• function mtk_cpu_dvfs_info_release
• function mtk_cpufreq_init
• function mtk_cpufreq_exit
• function mtk_cpufreq_probe
• function for_each_present_cpu
• function mtk_cpufreq_driver_init
• function mtk_cpufreq_driver_exit
• module init mtk_cpufreq_driver_init

Annotated Snippet

module_init(mtk_cpufreq_driver_init)

static void __exit mtk_cpufreq_driver_exit(void)
{
	platform_device_unregister(cpufreq_pdev);
	platform_driver_unregister(&mtk_cpufreq_platdrv);
}
module_exit(mtk_cpufreq_driver_exit)

MODULE_DESCRIPTION("MediaTek CPUFreq driver");
MODULE_AUTHOR("Pi-Cheng Chen <pi-cheng.chen@linaro.org>");
MODULE_LICENSE("GPL v2");

Annotation

• Immediate include surface: `linux/clk.h`, `linux/cpu.h`, `linux/cpufreq.h`, `linux/cpumask.h`, `linux/minmax.h`, `linux/module.h`, `linux/of.h`, `linux/of_platform.h`.
• Detected declarations: `struct mtk_cpufreq_platform_data`, `struct mtk_cpu_dvfs_info`, `function list_for_each_entry`, `function mtk_cpufreq_voltage_tracking`, `function mtk_cpufreq_set_voltage`, `function is_ccifreq_ready`, `function mtk_cpufreq_set_target`, `function mtk_cpufreq_opp_notifier`, `function mtk_cpu_dvfs_info_init`, `function mtk_cpu_dvfs_info_release`.
• Atlas domain: Driver Families / drivers/cpufreq.
• Implementation status: integration 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.