zturn开发板网口驱动的注册过程

z-turn网口设备树:

在zynq-7000.dtis文件:

gem0: ethernet@e000b000 {

compatible = "xlnx,ps7-ethernet-1.00.a";

reg = <0xe000b000 0x1000>;

status = "disabled";

interrupts = <0 22 4>;

clocks = <&clkc 13>, <&clkc 30>;

clock-names = "ref_clk", "aper_clk";

local-mac-address = [00 0a 35 00 00 00];

xlnx,has-mdio = <0x1>;

#address-cells = <1>;

#size-cells = <0>;

};

在zynq-zturn.dts将gen0设备修改成:

&gem0 {

compatible = "cdns,gem";

reg = <0xe000b000 0x4000>;

status = "okay";

interrupts = <0 22 4>;

interrupt-parent = <&intc>;

clocks = <&clkc 30>, <&clkc 30>, <&clkc 13>;

clock-names = "pclk", "hclk", "tx_clk";

phy-mode = "rgmii-id";

phy-handle = <&phy0>;

phy0: phy@0 {

compatible = "atheros,ar8035";

device_type = "ethernet-phy";

reg = <0>;

};

};

所以网口使用的是cadence的驱动,驱动源码位于drivers/net/ethernet/cadence/macb.c.

在macb_probe函数中分配net_device设备并初始化,设置mdio的clk:

/* Set MII management clock divider */

config = macb_mdc_clk_div(bp);

config |= macb_dbw(bp);

macb_writel(bp, NCFGR, config);

然后调用macb_mii_init进行phy设备的初始化.

phy设备挂在mdio bus下,所以先调用of_mdiobus_register注册了mdio bus设备,接着调用of_mdiobus_register_phy注册phy设备,

在of_mdiobus_register注册了phy设备之后,调用macb_mii_probe检测phy设备是否已经跟驱动关联,如果没有,调用phy_connect_direct

将phy设备的跟generic phy驱动关联.

函数调用关系:

macb_mii_init phy设备的初始化

-->of_mdiobus_register 注册mdio_bus

-->of_mdiobus_register_phy 注册phy_device,如果相关phy_driver驱动已经注册,测将phy_driver跟phy_device关联

-->macb_mii_probe

如果phy_devide还没有驱动

-->phy_connect_direct 将phy_device跟generic phy驱动关联

所以z-turn开发板的phy芯片驱动是drivers\net\phy\phy_device.c.

内核相关配置:

Device Drivers > Network device support > Ethernet driver support

[*] Cadence devices

<*> Cadence MACB/GEM support

Device Drivers > Network device support

-*- PHY Device support and infrastructure ---> 上面的选上后,该项自动选上,里边的其他驱动不用选