Linux/66AK2G02: Is RMII supported on Linux for the 66AK2G02

Hi Ville,

This should be supported, see Documentation/devicetree/bindings/net/ethernet.txt:
- phy-mode: string, operation mode of the PHY interface. This is now a de-facto
standard property; supported values are:
* "mii"
* "gmii"
* "sgmii"
* "qsgmii"
* "tbi"
* "rev-mii"
* "rmii"
* "rgmii" (RX and TX delays are added by the MAC when required)
* "rgmii-id" (RGMII with internal RX and TX delays provided by the PHY, the
MAC should not add the RX or TX delays in this case)
* "rgmii-rxid" (RGMII with internal RX delay provided by the PHY, the MAC
should not add an RX delay in this case)
* "rgmii-txid" (RGMII with internal TX delay provided by the PHY, the MAC
should not add an TX delay in this case)
* "rtbi"
* "smii"
* "xgmii"
* "trgmii"

You should be able to get the rmii mode working.

Best Regards,
Yordan

Hi Yordan,

This doesn't appear to work for me. I've figured out that to enable the RMII clock you need to write 4 to the ETH CLKCTRL register. Also thsee is an ethernet CFG register that needs to be set to 1 (RMII) instead of RGMII (2). The change that you suggested does neither of these... can you double check your suggestion does actually allow the netcp/ethss/etc to start using RMII mode?

Thanks

Ville

Hi VIlle,

Let me check this.

Best Regards,
Yordan