drivers/clk/mstar/clk-msc313-mpll.c

Source file repositories/reference/linux-study-clean/drivers/clk/mstar/clk-msc313-mpll.c

File Facts

System
Linux kernel
Corpus path
drivers/clk/mstar/clk-msc313-mpll.c
Extension
.c
Size
4467 bytes
Lines
156
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 msc313_mpll {
	struct clk_hw clk_hw;
	struct regmap_field *input_div;
	struct regmap_field *loop_div_first;
	struct regmap_field *loop_div_second;
	struct regmap_field *output_div;
	struct clk_hw_onecell_data *clk_data;
};

#define to_mpll(_hw) container_of(_hw, struct msc313_mpll, clk_hw)

static unsigned long msc313_mpll_recalc_rate(struct clk_hw *hw,
		unsigned long parent_rate)
{
	struct msc313_mpll *mpll = to_mpll(hw);
	unsigned int input_div, output_div, loop_first, loop_second;
	unsigned long output_rate;

	regmap_field_read(mpll->input_div, &input_div);
	regmap_field_read(mpll->output_div, &output_div);
	regmap_field_read(mpll->loop_div_first, &loop_first);
	regmap_field_read(mpll->loop_div_second, &loop_second);

	output_rate = parent_rate / (1 << input_div);
	output_rate *= (1 << loop_first) * max(loop_second, 1U);
	output_rate /= max(output_div, 1U);

	return output_rate;
}

static const struct clk_ops msc313_mpll_ops = {
	.recalc_rate = msc313_mpll_recalc_rate,
};

static const struct clk_parent_data mpll_parent = {
	.index	= 0,
};

static int msc313_mpll_probe(struct platform_device *pdev)
{
	void __iomem *base;
	struct msc313_mpll *mpll;
	struct clk_init_data clk_init = { };
	struct device *dev = &pdev->dev;
	struct regmap *regmap;
	char *outputname;
	struct clk_hw *divhw;
	int ret, i;

	mpll = devm_kzalloc(dev, sizeof(*mpll), GFP_KERNEL);
	if (!mpll)
		return -ENOMEM;

	base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(base))
		return PTR_ERR(base);

	regmap = devm_regmap_init_mmio(dev, base, &msc313_mpll_regmap_config);
	if (IS_ERR(regmap))
		return PTR_ERR(regmap);

	mpll->input_div = devm_regmap_field_alloc(dev, regmap, config1_input_div_first);
	if (IS_ERR(mpll->input_div))
		return PTR_ERR(mpll->input_div);
	mpll->output_div = devm_regmap_field_alloc(dev, regmap, config2_output_div_first);
	if (IS_ERR(mpll->output_div))
		return PTR_ERR(mpll->output_div);
	mpll->loop_div_first = devm_regmap_field_alloc(dev, regmap, config1_loop_div_first);
	if (IS_ERR(mpll->loop_div_first))
		return PTR_ERR(mpll->loop_div_first);
	mpll->loop_div_second = devm_regmap_field_alloc(dev, regmap, config2_loop_div_second);
	if (IS_ERR(mpll->loop_div_second))
		return PTR_ERR(mpll->loop_div_second);

	mpll->clk_data = devm_kzalloc(dev, struct_size(mpll->clk_data, hws,
			ARRAY_SIZE(output_dividers)), GFP_KERNEL);
	if (!mpll->clk_data)
		return -ENOMEM;

	clk_init.name = dev_name(dev);
	clk_init.ops = &msc313_mpll_ops;
	clk_init.parent_data = &mpll_parent;
	clk_init.num_parents = 1;
	mpll->clk_hw.init = &clk_init;

	ret = devm_clk_hw_register(dev, &mpll->clk_hw);
	if (ret)
		return ret;

	mpll->clk_data->num = NUMOUTPUTS;

Annotation

Implementation Notes