drivers/usb/dwc3/dwc3-exynos.c

Source file repositories/reference/linux-study-clean/drivers/usb/dwc3/dwc3-exynos.c

File Facts

System
Linux kernel
Corpus path
drivers/usb/dwc3/dwc3-exynos.c
Extension
.c
Size
6899 bytes
Lines
286
Domain
Driver Families
Bucket
drivers/usb
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 dwc3_exynos_driverdata {
	const char		*clk_names[DWC3_EXYNOS_MAX_CLOCKS];
	int			num_clks;
	int			suspend_clk_idx;
};

struct dwc3_exynos {
	struct device		*dev;

	const char		**clk_names;
	struct clk		*clks[DWC3_EXYNOS_MAX_CLOCKS];
	int			num_clks;
	int			suspend_clk_idx;

	struct regulator	*vdd33;
	struct regulator	*vdd10;
};

static int dwc3_exynos_probe(struct platform_device *pdev)
{
	struct dwc3_exynos	*exynos;
	struct device		*dev = &pdev->dev;
	struct device_node	*node = dev->of_node;
	const struct dwc3_exynos_driverdata *driver_data;
	int			i, ret;

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

	driver_data = of_device_get_match_data(dev);
	exynos->dev = dev;
	exynos->num_clks = driver_data->num_clks;
	exynos->clk_names = (const char **)driver_data->clk_names;
	exynos->suspend_clk_idx = driver_data->suspend_clk_idx;

	platform_set_drvdata(pdev, exynos);

	for (i = 0; i < exynos->num_clks; i++) {
		exynos->clks[i] = devm_clk_get(dev, exynos->clk_names[i]);
		if (IS_ERR(exynos->clks[i])) {
			dev_err(dev, "failed to get clock: %s\n",
				exynos->clk_names[i]);
			return PTR_ERR(exynos->clks[i]);
		}
	}

	for (i = 0; i < exynos->num_clks; i++) {
		ret = clk_prepare_enable(exynos->clks[i]);
		if (ret) {
			while (i-- > 0)
				clk_disable_unprepare(exynos->clks[i]);
			return ret;
		}
	}

	if (exynos->suspend_clk_idx >= 0)
		clk_prepare_enable(exynos->clks[exynos->suspend_clk_idx]);

	exynos->vdd33 = devm_regulator_get(dev, "vdd33");
	if (IS_ERR(exynos->vdd33)) {
		ret = PTR_ERR(exynos->vdd33);
		goto vdd33_err;
	}
	ret = regulator_enable(exynos->vdd33);
	if (ret) {
		dev_err(dev, "Failed to enable VDD33 supply\n");
		goto vdd33_err;
	}

	exynos->vdd10 = devm_regulator_get(dev, "vdd10");
	if (IS_ERR(exynos->vdd10)) {
		ret = PTR_ERR(exynos->vdd10);
		goto vdd10_err;
	}
	ret = regulator_enable(exynos->vdd10);
	if (ret) {
		dev_err(dev, "Failed to enable VDD10 supply\n");
		goto vdd10_err;
	}

	if (node) {
		ret = of_platform_populate(node, NULL, NULL, dev);
		if (ret) {
			dev_err(dev, "failed to add dwc3 core\n");
			goto populate_err;
		}
	} else {
		dev_err(dev, "no device node, failed to add dwc3 core\n");
		ret = -ENODEV;

Annotation

Implementation Notes