> - Do all PHYs support manual setting of the LED level, or are the PHYs > that can only work with HW triggers? There are PHYs with do not have simple on/off. > - Is setting PHY registers always efficiently possible, or should SW > triggers be avoided in certain cases? I'm thinking about setups like > mdio-gpio. I guess this can only become an issue for triggers that > blink. There are uses cases where not using software frequently writing registers would be good. PTP time stamping is one, where the extra jitter can reduce the accuracy of the clock. I also think activity blinking in software is unlikely to be accepted. Nothing extra is allowed in the hot path, when you can be dealing with a million or more packets per second. So i would say limit software fallback to link and speed, and don't assume that is even possible depending on the hardware. Andrew
