drivers/video/fbdev/via/via_clock.h

File Facts

System

Linux kernel

Corpus path

drivers/video/fbdev/via/via_clock.h

Extension

.h

Size

1525 bytes

Lines

62

Domain

Driver Families

Bucket

drivers/video

Inferred role

Driver Families: implementation source

Status

source 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 or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/types.h

Detected Declarations

• struct via_pll_config
• struct via_clock
• enum via_clksrc
• function get_pll_internal_frequency
• function get_pll_output_frequency

Annotated Snippet

struct via_pll_config {
	u16 multiplier;
	u8 divisor;
	u8 rshift;
};

struct via_clock {
	void (*set_primary_clock_state)(u8 state);
	void (*set_primary_clock_source)(enum via_clksrc src, bool use_pll);
	void (*set_primary_pll_state)(u8 state);
	void (*set_primary_pll)(struct via_pll_config config);

	void (*set_secondary_clock_state)(u8 state);
	void (*set_secondary_clock_source)(enum via_clksrc src, bool use_pll);
	void (*set_secondary_pll_state)(u8 state);
	void (*set_secondary_pll)(struct via_pll_config config);

	void (*set_engine_pll_state)(u8 state);
	void (*set_engine_pll)(struct via_pll_config config);
};


static inline u32 get_pll_internal_frequency(u32 ref_freq,
	struct via_pll_config pll)
{
	return ref_freq / pll.divisor * pll.multiplier;
}

static inline u32 get_pll_output_frequency(u32 ref_freq,
	struct via_pll_config pll)
{
	return get_pll_internal_frequency(ref_freq, pll) >> pll.rshift;
}

void via_clock_init(struct via_clock *clock, int gfx_chip);

#endif /* __VIA_CLOCK_H__ */

Annotation

• Immediate include surface: `linux/types.h`.
• Detected declarations: `struct via_pll_config`, `struct via_clock`, `enum via_clksrc`, `function get_pll_internal_frequency`, `function get_pll_output_frequency`.
• Atlas domain: Driver Families / drivers/video.
• Implementation status: source implementation candidate.

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.