求助：Micrel KSZ8041FTL 光口PHY芯片在Linux下的驱动调试

heat.huang 2019-04-05 01:26:35

（一）开发环境：
平台：SAMA5D27-SOM1-EK
处理器：ARM Cortex A5
Linux系统版本：4.14.88
PHY芯片：Micrel KSZ8041FTL （Fiber-Mode）

（二）问题描述：
在设备树 macb 节点下添加 phy子节点，并添加compatible属性包含了phy的ID，用于phy驱动的匹配。

			macb0: ethernet@f8008000 {

				pinctrl-names = "default";

				pinctrl-0 = <&pinctrl_macb0_default>;

				phy-mode = "rmii";

				

				/* 光 PHY  */

				ethernet-phy@1 { 	

					compatible = "ethernet-phy-id0022.1510", "ethernet-phy-ieee802.3-c22";

					reg = <0x1>;  /*The default PHY Address is 00001 */

					interrupt-parent = <&pioA>;

					interrupts = <PIN_PD31 IRQ_TYPE_LEVEL_LOW>;

					pinctrl-names = "default";

					pinctrl-0 = <&pinctrl_macb0_phy_irq>;

					// reset-gpios = <&pioD 19 1>;

					// micrel,rmii-reference-clock-select-25-mhz;

				

					micrel,fiber-mode; /*光纤模式*/



				};



				

			};

KSZ8041FTL 驱动： \drivers\net\phy\micrel.c ，内核中已支持。
目前系统跑起来后，加载了phy的驱动，启动信息如下。但初试化网卡时提示网卡没有被激活，udhcpc也没有办法分配IP地址。应该从哪些地方去排查问题呢？
【启动信息如下，有些信息是我自己添加的打印日志】

CAN device driver interface

m_can fc050000.can: m_can device registered (irq=47, version=31)

 ========== macb_probe =========

macb f8008000.ethernet: invalid hw address, using random

   ========> macb_mii_init =======

 -- of_mdiobus_register --

       =============> Enter mdiobus_register =========

libphy: MACB_mii_bus: probed

== bus->name: MACB_mii_bus== 

 === End mdiobus_register ===

=== of_mdio_parse_addr: addr = 1  ===

==== enter: of_mdiobus_register_phy =====

is_c45 = 0 

 ret = 0 

 value = 1 

==== enter: phy_device_create =====

 == phy_device init ok ==

==== kszphy_probe ok. =====

=== Limit supported and advertised modes in fiber mode ===

Micrel KSZ8041 f8008000.ethernet-ffffffff:01: attached PHY driver [Micrel KSZ8041] (mi

macb f8008000.ethernet eth0: Cadence GEM rev 0x00020203 at 0xf8008000 irq 28 (46:2e:5

分配地址：

Starting network: IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready

=== Skip auto-negotiation in fiber mode ===

== phydev->speed : 100 ==

== phydev->duplex : 1 ==

== phydev->phy_id : 221510 ==

== phydev->autoneg : 0 ==

udhcpc: started, v1.26.2

udhcpc: sending discover

udhcpc: sending discover

udhcpc: sending discover

udhcpc: no lease, failing

FAIL

进入系统后，ifconfig查看网卡状态

# ifconfig

eth0      Link encap:Ethernet  HWaddr 46:2E:53:1D:E1:E4  

          UP BROADCAST MULTICAST  MTU:1500  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

          Interrupt:28 Base address:0x8000 



lo        Link encap:Local Loopback  

          inet addr:127.0.0.1  Mask:255.0.0.0

          inet6 addr: ::1/128 Scope:Host

          UP LOOPBACK RUNNING  MTU:65536  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)



# 

# ethtool eth0

Settings for eth0:

	Supported ports: [ ]

	Supported link modes:   100baseT/Half 100baseT/Full 

	Supported pause frame use: No

	Supports auto-negotiation: No

	Advertised link modes:  100baseT/Half 100baseT/Full 

	Advertised pause frame use: No

	Advertised auto-negotiation: No

	Speed: 100Mb/s

	Duplex: Full

	Port: MII

	PHYAD: 1

	Transceiver: external

	Auto-negotiation: off

	Link detected: no