How to support scc-enet on MPC8247 in Linux 2.6.32.6

[Peter Pan]

There is an MDIO used by FCC, but the SCC is connected with LXT905,
which is Ethernet Interface Adapter. So I think the SCC should be
fixed-link. But how can I set the fixed-link property? I searched
through the Document directory, there is nothing about the fixed-link
property.

2010/4/23 Scott Wood <scottwood at freescale.com>:
> Peter Pan wrote:
>>
>> I'm porting Linux 2.6.32.6 to our MPC8247 based board. We use SCC3 and
>> SCC4 as ethernet port. These two ports are connect with LXT905 PHY
>> chip.
>> I'm now using fs_enet driver, how should I config the scc port in dtc
>> file. I copied from mgcoge.dts file, and my dtc file of scc enet is
>> follows:
>>
>>            eth2: ethernet at 11a40 {
>>                device_type = "network";
>>                compatible = "fsl,mpc8247-scc-enet",
>>                             "fsl,cpm2-scc-enet";
>>                reg = <0x11a40 0x20 0x8200 0x100 0x11390 0x1>;
>>                local-mac-address = [ 00 00 00 00 00 00 ]; /* filled
>> by U-Boot */
>>                interrupts = <42 8>;
>>                interrupt-parent = <&PIC>;
>>                linux,network-index = <0x2>;
>>                fsl,cpm-command = <0x8c00000>;
>>                fixed-link = < 0 0 10 0 0 >;
>>            };
>> But i does not working. Linux says that PHY 0:00 is not found. I dive
>> into the code, and that's according to the fixed-link property.
>> I'm wondering how to support scc-enet in my situation.
>
> Do you really want fixed-link, or does the board have a working MDIO
> interface?  If the latter, you need a phy-handle property instead, pointing
> to a PHY node under an MDIO bus node that represents how MDIO is wired on
> your board.
>
> -Scott
>