Debugging EcoNet's MT7530 PHYs

Tue Jan 27 03:05:59 PST 2026

I was approached about this topic on November 2025. I have nothing new to
add but to quote my private response to George-Alexandru Popa, minus the
rants. So please stop copying me on this thread. Ask the netdev mailing
list instead; there are qualified people such as Vladimir, Andrew, and
Linus that can provide guidance.

Chester A.

> Ok then tell the chap working on the ethernet driver to use the "mediatek,mt7621" compatible string for the switch as that's the correct one for MCM MT7530. It's called that because MCM MT7530 only existed on MT7621 SoC until this EcoNet SoC, apparently. It's still unclear if MCM for EcoNet SoC needs different setup operations though. I can help with that if it doesn't work out of the box, once the Ethernet driver is finalised.
> 
> Chester A.
> 
> On 18 November 2025 00:15:41 GMT+03:00, George-Alexandru Popa <alexceltare2 at yahoo.com> wrote:
>> I suspect is multichip module because the OEM dump says "MCM MT7530":
>>
>> insmod ETH_LAN drivermacType = 0qdma_lan: physical_size is 0x00200000ether.c:v1.00-NAPI 29.Mar.2015eth0: FE MAC Ethernet address: 50:E0:39:00:09:90Use External switch ,type 10EN7512 TRGMII V1.0 GE Rxet cal (1)(0)(0)(0x21)  GE Rext AnaCal Done! (2)(0x22)  GE Rext AnaCal Done! (2)(0x22)  GE R50 AnaCal Done! (2) (0x27)(0xa7)  GE R50 AnaCal Done! (2) (0x27)(0xa7)  GE R50 AnaCal Done! (2) (0x27)(0xa7)  GE R50 AnaCal Done! (2) (0x27)(0xa7) GE Tx offset AnaCal Done! (5)(0x25) GE Tx offset AnaCal Done! (4)(0x24) GE Tx offset AnaCal Done! (2)(0x22) GE Tx offset AnaCal Done! (3)(0x23) GE Tx amp AnaCal Done! (pair-0)(0x12)(0x1020) GE Tx amp AnaCal Done! (30) (0x2) GE Tx amp AnaCal Done! (pair-1)(0x17)(0x420) GE Tx amp AnaCal Done! (30) (0x2) GE Tx amp AnaCal Done! (pair-2)(0x19)(0x920) GE Tx amp AnaCal Done! (25) (0x7) GE Tx amp AnaCal Done! (pair-3)(0x21)(0x220) GE Tx amp AnaCal Done! (32) (0x0)tcPhyVerLookUp 3887 0tcPhyVerLookUp 3887 0tcPhyVerLookUp 3887 0tcPhyVerLookUp 3887 9412 7530 Ge, 0x1MCM MT7530tcPhyVerLookUp 3887 9412 7530 Ge, 0x1MCM MT7530 [tcPhyInit] in  [tcPhyInit] out , r31 = (1, 0x0)
>>
>>    On Monday 17 November 2025 at 18:58:54 GMT, Chester A. Unal <chester.a.unal at arinc9.com> wrote:  
>> You're not writing an ethernet driver for MT7530. MT7530 is an ethernet
>> switch. You'd write a DSA driver, which you don't need. You're writing an
>> ethernet driver for EcoNet EN751221 but your chaps are struggling to make
>> the MDIO bus of it work. So I have nothing to help with because I don't do
>> ethernet drivers so once whomever is working on the Ethernet driver makes
>> the MDIO bus work, the MT7530 switch that is connected to the bus will
>> work fine using the MT7530 DSA subdriver. That is, of course, if this
>> MT7530 switch is a standalone IC on the Zyxel device you mention.
>>
>> Please let me know if the MT7530 switch on the Zyxel is standalone or if
>> it's in the EcoNet SoC as part of a multi-chip module, or if it's like the
>> switch component in MT7988 SoC meaning it's MMIO-accessed.
>>
>> Chester A.
>>
>> On 17 November 2025 17:14:42 GMT+03:00, George-Alexandru Popa <alexceltare2 at yahoo.com> wrote:
>>> P.S. Also, feel free to highlight any misinformation as that will help us speed things up.
>>>     On Monday 17 November 2025 at 14:12:06 GMT, George-Alexandru Popa <alexceltare2 at yahoo.com> wrote:  
>>>
>>>   The link that i've sent is where the relevant discussion actually starts. Basically, we want to know if we need to write an entire MT7530 ethernet driver or it's already implemented and we're just wasting time on this part. CJD already worked on it on here: https://github.com/cjdelisle/econet_eth
>>>
>>>
>>>
>>>     On Monday 17 November 2025 at 12:32:25 GMT, Chester A. Unal <chester.a.unal at arinc9.com> wrote:  
>>>
>>> Hey Alex.
>>>
>>> I'm not going to read all of that thread which is riddled with misinformation. You're going to have to summarise what do you want me to weigh on.
>>>
>>> Chester A.
>>>
>>> On 17 November 2025 14:57:09 GMT+03:00, George-Alexandru Popa <alexceltare2 at yahoo.com> wrote:
>>>> Hi there.
>>>> I've seen that you've worked on the MT7530 DSA driver(https://lists.infradead.org/pipermail/linux-mediatek/2024-March/076381.html) and would greatly appreciate if you could give us some pointers on how could we tackle our issue. Does the driver needs rewriting entirely or is just a per-device issue with the MIDO bus? Discussion here: https://forum.openwrt.org/t/openwrt-support-for-zyxel-pmg5617ga-and-econet-socs-first-gpon-support/144231/235
>>>>
>>>>
>>>> Thanks,
>>>> Alex
>>>>
>>>>
>>>
>>  