drivers/clk/clk-s2mps11.c

Source file repositories/reference/linux-study-clean/drivers/clk/clk-s2mps11.c

File Facts

System
Linux kernel
Corpus path
drivers/clk/clk-s2mps11.c
Extension
.c
Size
7223 bytes
Lines
283
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 s2mps11_clk {
	struct sec_pmic_dev *iodev;
	struct device_node *clk_np;
	struct clk_hw hw;
	struct clk *clk;
	struct clk_lookup *lookup;
	u32 mask;
	unsigned int reg;
};

static struct s2mps11_clk *to_s2mps11_clk(struct clk_hw *hw)
{
	return container_of(hw, struct s2mps11_clk, hw);
}

static int s2mps11_clk_prepare(struct clk_hw *hw)
{
	struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);

	return regmap_update_bits(s2mps11->iodev->regmap_pmic,
				 s2mps11->reg,
				 s2mps11->mask, s2mps11->mask);
}

static void s2mps11_clk_unprepare(struct clk_hw *hw)
{
	struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);

	regmap_update_bits(s2mps11->iodev->regmap_pmic, s2mps11->reg,
			   s2mps11->mask, ~s2mps11->mask);
}

static int s2mps11_clk_is_prepared(struct clk_hw *hw)
{
	int ret;
	u32 val;
	struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);

	ret = regmap_read(s2mps11->iodev->regmap_pmic,
				s2mps11->reg, &val);
	if (ret < 0)
		return -EINVAL;

	return val & s2mps11->mask;
}

static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw,
					     unsigned long parent_rate)
{
	return 32768;
}

static const struct clk_ops s2mps11_clk_ops = {
	.prepare	= s2mps11_clk_prepare,
	.unprepare	= s2mps11_clk_unprepare,
	.is_prepared	= s2mps11_clk_is_prepared,
	.recalc_rate	= s2mps11_clk_recalc_rate,
};

/* This s2mps11_clks_init tructure is common to s2mps11, s2mps13 and s2mps14 */
static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = {
	[S2MPS11_CLK_AP] = {
		.name = "s2mps11_ap",
		.ops = &s2mps11_clk_ops,
	},
	[S2MPS11_CLK_CP] = {
		.name = "s2mps11_cp",
		.ops = &s2mps11_clk_ops,
	},
	[S2MPS11_CLK_BT] = {
		.name = "s2mps11_bt",
		.ops = &s2mps11_clk_ops,
	},
};

static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev,
		struct clk_init_data *clks_init)
{
	struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	struct device_node *clk_np;
	int i;

	if (!iodev->dev->of_node)
		return ERR_PTR(-EINVAL);

	clk_np = of_get_child_by_name(iodev->dev->of_node, "clocks");
	if (!clk_np) {
		dev_err(&pdev->dev, "could not find clock sub-node\n");
		return ERR_PTR(-EINVAL);
	}

Annotation

Implementation Notes