RK3588平台开发系列讲解（以太网篇）MDIO底层驱动

RK3588平台开发系列讲解（以太网篇）MDIO底层驱动在RK3588平台上，以太网控制器的MDIO（MII Management Interface）是用来管理PHY（Physical Layer）设备的接口。在本文中，我们将讲解如何编写MDIO底层驱动，以便在RK3588平台上使用以太网控制器。

首先，我们需要在设备树中定义MDIO节点，如下所示：

cmdio {
 compatible = "snps,dwmac-mdio";
 #address-cells = <1>;
 #size-cells = <0>;
 phy0: ethernet-phy@0 {
 reg = <0>;
 device_type = "ethernet-phy";
 /* PHY specific properties */
 };
};

c#include 
#include 
#include 
#include 
#include 

static int mdio_probe(struct platform_device *pdev)
{
 struct device_node *np = pdev->dev.of_node;
 struct mdio_device *mdio;
 struct mdio_device_id *id;
 int ret;

 mdio = devm_kzalloc(&pdev->dev, sizeof(*mdio), GFP_KERNEL);
 if (!mdio)
 return -ENOMEM;

 mdio->bus = of_mdio_find_bus(np);
 if (!mdio->bus)
 return -ENODEV;

 id = of_match_device(mdio_match, &pdev->dev);
 if (!id)
 return -ENODEV;

 mdio->dev = &pdev->dev;
 mdio->id = id;

 ret = mdio_register(mdio);
 if (ret)
 return ret;

 platform_set_drvdata(pdev, mdio);

 return0;
}

static int mdio_remove(struct platform_device *pdev)
{
 struct mdio_device *mdio = platform_get_drvdata(pdev);

 mdio_unregister(mdio);

 return0;
}

static const struct of_device_id mdio_match[] = {
 { .compatible = "snps,dwmac-mdio" },
 { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mdio_match);

static struct platform_driver mdio_driver = {
 .probe = mdio_probe,
 .remove = mdio_remove,
 .driver = {
 .name = "rk3588-mdio",
 .of_match_table = of_match_ptr(mdio_match),
 },
};
module_platform_driver(mdio_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("MDIO driver for RK3588 platform");