drivers/clk/zynq/clkc.c

File Facts

System

Linux kernel

Corpus path

drivers/clk/zynq/clkc.c

Extension

.c

Size

21433 bytes

Lines

615

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.
• 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/zynq.h
• linux/clk.h
• linux/clk-provider.h
• linux/of.h
• linux/of_address.h
• linux/slab.h
• linux/string.h
• linux/io.h

Detected Declarations

• enum zynq_clk
• function zynq_clk_register_fclk
• function zynq_clk_register_periph_clk
• function zynq_clk_setup
• function zynq_clock_init

Annotated Snippet

if (IS_ERR(clks[i])) {
			pr_err("Zynq clk %d: register failed with %ld\n",
			       i, PTR_ERR(clks[i]));
			BUG();
		}
	}

	clk_data.clks = clks;
	clk_data.clk_num = ARRAY_SIZE(clks);
	of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
}

CLK_OF_DECLARE(zynq_clkc, "xlnx,ps7-clkc", zynq_clk_setup);

void __init zynq_clock_init(void)
{
	struct device_node *np;
	struct device_node *slcr;
	struct resource res;

	np = of_find_compatible_node(NULL, NULL, "xlnx,ps7-clkc");
	if (!np) {
		pr_err("%s: clkc node not found\n", __func__);
		goto np_err;
	}

	if (of_address_to_resource(np, 0, &res)) {
		pr_err("%pOFn: failed to get resource\n", np);
		goto np_err;
	}

	slcr = of_get_parent(np);

	if (slcr->data) {
		zynq_clkc_base = (__force void __iomem *)slcr->data + res.start;
	} else {
		pr_err("%pOFn: Unable to get I/O memory\n", np);
		of_node_put(slcr);
		goto np_err;
	}

	pr_info("%s: clkc starts at %p\n", __func__, zynq_clkc_base);

	of_node_put(slcr);
	of_node_put(np);

	return;

np_err:
	of_node_put(np);
	BUG();
}

Annotation

• Immediate include surface: `linux/clk/zynq.h`, `linux/clk.h`, `linux/clk-provider.h`, `linux/of.h`, `linux/of_address.h`, `linux/slab.h`, `linux/string.h`, `linux/io.h`.
• Detected declarations: `enum zynq_clk`, `function zynq_clk_register_fclk`, `function zynq_clk_register_periph_clk`, `function zynq_clk_setup`, `function zynq_clock_init`.
• Atlas domain: Driver Families / drivers/clk.
• Implementation status: source 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.