drivers/clk/renesas/rcar-cpg-lib.c

Source file repositories/reference/linux-study-clean/drivers/clk/renesas/rcar-cpg-lib.c

File Facts

System
Linux kernel
Corpus path
drivers/clk/renesas/rcar-cpg-lib.c
Extension
.c
Size
4847 bytes
Lines
209
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.

Dependency Surface

Detected Declarations

Annotated Snippet

struct rpc_clock {
	struct clk_divider div;
	struct clk_gate gate;
	/*
	 * One notifier covers both RPC and RPCD2 clocks as they are both
	 * controlled by the same RPCCKCR register...
	 */
	struct cpg_simple_notifier csn;
};

static const struct clk_div_table cpg_rpc_div_table[] = {
	{ 1, 2 }, { 3, 4 }, { 5, 6 }, { 7, 8 }, { 0, 0 },
};

struct clk * __init cpg_rpc_clk_register(const char *name,
	void __iomem *rpcckcr, const char *parent_name,
	struct raw_notifier_head *notifiers)
{
	struct rpc_clock *rpc;
	struct clk *clk;

	rpc = kzalloc_obj(*rpc);
	if (!rpc)
		return ERR_PTR(-ENOMEM);

	rpc->div.reg = rpcckcr;
	rpc->div.width = 3;
	rpc->div.table = cpg_rpc_div_table;
	rpc->div.lock = &cpg_lock;

	rpc->gate.reg = rpcckcr;
	rpc->gate.bit_idx = 8;
	rpc->gate.flags = CLK_GATE_SET_TO_DISABLE;
	rpc->gate.lock = &cpg_lock;

	rpc->csn.reg = rpcckcr;

	clk = clk_register_composite(NULL, name, &parent_name, 1, NULL, NULL,
				     &rpc->div.hw,  &clk_divider_ops,
				     &rpc->gate.hw, &clk_gate_ops,
				     CLK_SET_RATE_PARENT);
	if (IS_ERR(clk)) {
		kfree(rpc);
		return clk;
	}

	cpg_simple_notifier_register(notifiers, &rpc->csn);
	return clk;
}

struct rpcd2_clock {
	struct clk_fixed_factor fixed;
	struct clk_gate gate;
};

struct clk * __init cpg_rpcd2_clk_register(const char *name,
					   void __iomem *rpcckcr,
					   const char *parent_name)
{
	struct rpcd2_clock *rpcd2;
	struct clk *clk;

	rpcd2 = kzalloc_obj(*rpcd2);
	if (!rpcd2)
		return ERR_PTR(-ENOMEM);

	rpcd2->fixed.mult = 1;
	rpcd2->fixed.div = 2;

	rpcd2->gate.reg = rpcckcr;
	rpcd2->gate.bit_idx = 9;
	rpcd2->gate.flags = CLK_GATE_SET_TO_DISABLE;
	rpcd2->gate.lock = &cpg_lock;

	clk = clk_register_composite(NULL, name, &parent_name, 1, NULL, NULL,
				     &rpcd2->fixed.hw, &clk_fixed_factor_ops,
				     &rpcd2->gate.hw, &clk_gate_ops,
				     CLK_SET_RATE_PARENT);
	if (IS_ERR(clk))
		kfree(rpcd2);

	return clk;
}

Annotation

Implementation Notes