慢慢欣赏linux phy驱动初始化2_phy驱动的probe函数-优快云博客

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/

收录于