drivers/net/ethernet/qualcomm/emac/emac-phy.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/qualcomm/emac/emac-phy.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/qualcomm/emac/emac-phy.c
Extension
.c
Size
5082 bytes
Lines
157
Domain
Driver Families
Bucket
drivers/net
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 (ret) {
			dev_err(&pdev->dev, "could not register mdio bus\n");
			return ret;
		}
		ret = device_property_read_u32(&pdev->dev, "phy-channel",
					       &phy_addr);
		if (ret)
			/* If we can't read a valid phy address, then assume
			 * that there is only one phy on this mdio bus.
			 */
			adpt->phydev = phy_find_first(mii_bus);
		else
			adpt->phydev = mdiobus_get_phy(mii_bus, phy_addr);

		/* of_phy_find_device() claims a reference to the phydev,
		 * so we do that here manually as well. When the driver
		 * later unloads, it can unilaterally drop the reference
		 * without worrying about ACPI vs DT.
		 */
		if (adpt->phydev)
			get_device(&adpt->phydev->mdio.dev);
	} else {
		struct device_node *phy_np;

		ret = of_mdiobus_register(mii_bus, np);
		if (ret) {
			dev_err(&pdev->dev, "could not register mdio bus\n");
			return ret;
		}

		phy_np = of_parse_phandle(np, "phy-handle", 0);
		adpt->phydev = of_phy_find_device(phy_np);
		of_node_put(phy_np);
	}

	if (!adpt->phydev) {
		dev_err(&pdev->dev, "could not find external phy\n");
		mdiobus_unregister(mii_bus);
		return -ENODEV;
	}

	return 0;
}

Annotation

Implementation Notes