drivers/bus/tegra-aconnect.c

Source file repositories/reference/linux-study-clean/drivers/bus/tegra-aconnect.c

File Facts

System
Linux kernel
Corpus path
drivers/bus/tegra-aconnect.c
Extension
.c
Size
3008 bytes
Lines
117
Domain
Driver Families
Bucket
drivers/bus
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 tegra_aconnect {
	struct clk	*ape_clk;
	struct clk	*apb2ape_clk;
};

static int tegra_aconnect_probe(struct platform_device *pdev)
{
	struct tegra_aconnect *aconnect;

	if (!pdev->dev.of_node)
		return -EINVAL;

	aconnect = devm_kzalloc(&pdev->dev, sizeof(struct tegra_aconnect),
				GFP_KERNEL);
	if (!aconnect)
		return -ENOMEM;

	aconnect->ape_clk = devm_clk_get(&pdev->dev, "ape");
	if (IS_ERR(aconnect->ape_clk))
		return dev_err_probe(&pdev->dev, PTR_ERR(aconnect->ape_clk),
				     "can't retrieve ape clock\n");

	aconnect->apb2ape_clk = devm_clk_get(&pdev->dev, "apb2ape");
	if (IS_ERR(aconnect->apb2ape_clk))
		return dev_err_probe(&pdev->dev, PTR_ERR(aconnect->apb2ape_clk),
				     "can't retrieve apb2ape clock\n");

	dev_set_drvdata(&pdev->dev, aconnect);
	pm_runtime_enable(&pdev->dev);

	of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);

	dev_info(&pdev->dev, "Tegra ACONNECT bus registered\n");

	return 0;
}

static void tegra_aconnect_remove(struct platform_device *pdev)
{
	pm_runtime_disable(&pdev->dev);
}

static int tegra_aconnect_runtime_resume(struct device *dev)
{
	struct tegra_aconnect *aconnect = dev_get_drvdata(dev);
	int ret;

	ret = clk_prepare_enable(aconnect->ape_clk);
	if (ret) {
		dev_err(dev, "ape clk_enable failed: %d\n", ret);
		return ret;
	}

	ret = clk_prepare_enable(aconnect->apb2ape_clk);
	if (ret) {
		clk_disable_unprepare(aconnect->ape_clk);
		dev_err(dev, "apb2ape clk_enable failed: %d\n", ret);
		return ret;
	}

	return 0;
}

static int tegra_aconnect_runtime_suspend(struct device *dev)
{
	struct tegra_aconnect *aconnect = dev_get_drvdata(dev);

	clk_disable_unprepare(aconnect->ape_clk);
	clk_disable_unprepare(aconnect->apb2ape_clk);

	return 0;
}

static const struct dev_pm_ops tegra_aconnect_pm_ops = {
	SET_RUNTIME_PM_OPS(tegra_aconnect_runtime_suspend,
			   tegra_aconnect_runtime_resume, NULL)
	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
				      pm_runtime_force_resume)
};

static const struct of_device_id tegra_aconnect_of_match[] = {
	{ .compatible = "nvidia,tegra210-aconnect", },
	{ }
};
MODULE_DEVICE_TABLE(of, tegra_aconnect_of_match);

static struct platform_driver tegra_aconnect_driver = {
	.probe = tegra_aconnect_probe,
	.remove = tegra_aconnect_remove,
	.driver = {

Annotation

Implementation Notes