drivers/mfd/bcm2835-pm.c

Source file repositories/reference/linux-study-clean/drivers/mfd/bcm2835-pm.c

File Facts

System
Linux kernel
Corpus path
drivers/mfd/bcm2835-pm.c
Extension
.c
Size
3346 bytes
Lines
128
Domain
Driver Families
Bucket
drivers/mfd
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

if (res) {
			pm->asb = devm_ioremap_resource(&pdev->dev, res);
			if (IS_ERR(pm->asb))
				pm->asb = NULL;
		}

		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
						    "rpivid_asb");
		if (res) {
			pm->rpivid_asb = devm_ioremap_resource(&pdev->dev, res);
			if (IS_ERR(pm->rpivid_asb))
				pm->rpivid_asb = NULL;
		}

		return 0;
	}

	/* If no 'reg-names' property is found we can assume we're using old DTB. */
	pm->base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(pm->base))
		return PTR_ERR(pm->base);

	pm->asb = devm_platform_ioremap_resource(pdev, 1);
	if (IS_ERR(pm->asb))
		pm->asb = NULL;

	pm->rpivid_asb = devm_platform_ioremap_resource(pdev, 2);
	if (IS_ERR(pm->rpivid_asb))
		pm->rpivid_asb = NULL;

	return 0;
}

static int bcm2835_pm_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct bcm2835_pm *pm;
	int ret;

	pm = devm_kzalloc(dev, sizeof(*pm), GFP_KERNEL);
	if (!pm)
		return -ENOMEM;
	platform_set_drvdata(pdev, pm);

	pm->dev = dev;
	pm->soc = (uintptr_t)device_get_match_data(dev);

	ret = bcm2835_pm_get_pdata(pdev, pm);
	if (ret)
		return ret;

	ret = devm_mfd_add_devices(dev, -1,
				   bcm2835_pm_devs, ARRAY_SIZE(bcm2835_pm_devs),
				   NULL, 0, NULL);
	if (ret)
		return ret;

	/*
	 * We'll use the presence of the AXI ASB regs in the
	 * bcm2835-pm binding as the key for whether we can reference
	 * the full PM register range and support power domains.
	 */
	if (pm->asb || pm->soc == BCM2835_PM_SOC_BCM2712)
		return devm_mfd_add_devices(dev, -1, bcm2835_power_devs,
					    ARRAY_SIZE(bcm2835_power_devs),
					    NULL, 0, NULL);
	return 0;
}

static const struct of_device_id bcm2835_pm_of_match[] = {
	{ .compatible = "brcm,bcm2835-pm-wdt", },
	{ .compatible = "brcm,bcm2835-pm", .data = (void *)BCM2835_PM_SOC_BCM2835 },
	{ .compatible = "brcm,bcm2711-pm", .data = (void *)BCM2835_PM_SOC_BCM2711 },
	{ .compatible = "brcm,bcm2712-pm", .data = (void *)BCM2835_PM_SOC_BCM2712 },
	{},
};
MODULE_DEVICE_TABLE(of, bcm2835_pm_of_match);

static struct platform_driver bcm2835_pm_driver = {
	.probe		= bcm2835_pm_probe,
	.driver = {
		.name =	"bcm2835-pm",
		.of_match_table = bcm2835_pm_of_match,
	},
};
module_platform_driver(bcm2835_pm_driver);

MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM MFD");

Annotation

Implementation Notes