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慢慢欣赏linux phy驱动初始化2
mii_bus相当于phy_device控制器,很遗憾的是,它没有注册在mdio_bus总线上,这跟I2C总线不同。 内核如何获取PHY设备呢? 答案是只能从设备树获取。 fsl_pq_mdio_probe 函数从设备树解析platform_device获取phy_device信息fsl_pq_mdio_probe 会注册mii_bus控制器,包括控制器的phy的读写方法
int fsl_pq_mdio_probe(struct platform_device *ofdev){ struct mii_bus *new_bus = mdiobus_alloc(); // 申请总线控制器空间 new_bus->name = "Freescale PowerQUICC MII Bus", // 填充控制器域成员, 包括下面的PHY的读写方法 new_bus->read = &fsl_pq_mdio_read, new_bus->write = &fsl_pq_mdio_write, new_bus->reset = &fsl_pq_mdio_reset, new_bus->priv = priv; fsl_pq_mdio_bus_name(new_bus->id, np); err = of_mdiobus_register(new_bus, np); // 注册控制器并且扫描下面的PHY生成phy_device并注册}
对比fixed_phy的控制器以及注册
int __init fixed_mdio_bus_init(void){ struct fixed_mdio_bus *fmb = &platform_fmb; pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0); fmb->mii_bus = mdiobus_alloc(); snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "0"); fmb->mii_bus->name = "Fixed MDIO Bus"; fmb->mii_bus->priv = fmb; fmb->mii_bus->parent = &pdev->dev; fmb->mii_bus->read = &fixed_mdio_read; fmb->mii_bus->write = &fixed_mdio_write; fmb->mii_bus->irq = fmb->irqs; ret = mdiobus_register(fmb->mii_bus);}Marvell交换芯片88E6321/88E6320驱动总结-寄存器篇 http://ifreehub.com/archives/22/
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