drivers/clk/ti/dpll44xx.c

File Facts

System

Linux kernel

Corpus path

drivers/clk/ti/dpll44xx.c

Extension

.c

Size

5375 bytes

Lines

200

Domain

Driver Families

Bucket

drivers/clk

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/kernel.h
• linux/errno.h
• linux/clk.h
• linux/io.h
• linux/bitops.h
• linux/clk/ti.h
• clock.h

Detected Declarations

• function Copyright
• function omap4_dpllmx_deny_gatectrl
• function omap4_dpll_lpmode_recalc
• function omap4_dpll_regm4xen_recalc
• function omap4_dpll_regm4xen_determine_rate

Annotated Snippet

if (r < 0) {
			/*
			 * If we did not find a valid DPLL configuration, try again, but
			 * this time see if using the 4X multiplier can help. Enabling the
			 * 4X multiplier is equivalent to dividing the target rate by 4.
			 */
			tmp_req.rate /= OMAP4430_REGM4XEN_MULT;
			r = omap2_dpll_determine_rate(hw, &tmp_req);
			if (r < 0)
				return r;

			dd->last_rounded_rate *= OMAP4430_REGM4XEN_MULT;
			dd->last_rounded_m4xen = 1;
		}

		omap4_dpll_lpmode_recalc(dd);

		req->rate = dd->last_rounded_rate;
		req->best_parent_hw = dd->clk_ref;
	}

	req->best_parent_rate = req->rate;

	return 0;
}

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/errno.h`, `linux/clk.h`, `linux/io.h`, `linux/bitops.h`, `linux/clk/ti.h`, `clock.h`.
• Detected declarations: `function Copyright`, `function omap4_dpllmx_deny_gatectrl`, `function omap4_dpll_lpmode_recalc`, `function omap4_dpll_regm4xen_recalc`, `function omap4_dpll_regm4xen_determine_rate`.
• Atlas domain: Driver Families / drivers/clk.
• 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.