Linux/AM4376: Ethernet PHY modes in device tree

Jupon zhu

Part Number: AM4376

Tool/software: Linux

Hi,

Could someone tell me the differences between the phy-modes rgmii and rgmii-txid in DTS file about the ethernet? and if there is the phy-mode rmii-txid?

over 7 years ago

0 Pavel Botev over 7 years ago

TI__Guru**** 170625 points

Hi Jupon,

"rgmii - RX and TX delays are added by the MAC when required
"rgmii-txid" - RGMII with internal TX delay provided by the PHY, the MAC should not add an TX delay in this case

There is NO "rmii-txid" mode.

For example, AM335x TI EVM PHY needs TX internal delay, thus AM335x DTS file is using "rgmii-txid" PHY mode.

Refer to the below pointers for more info:

linux-kernel/Documentation/devicetree/bindings/net/ethernet.txt
downloads.ti.com/.../Foundational_Components_Kernel_Drivers.html

Regards,
Pavel

0 Jupon zhu over 7 years ago in reply to Pavel Botev

Prodigy 40 points

Hi Pavel,
Thanks a lot, you just did me a big help.

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Linux/AM4376: Ethernet PHY modes in device tree