Quoting g...@kernel.org:
I have been working towards supporting the MT7530 switch as used in the
MediaTek MT7621 SoC. Unlike the MediaTek MT7623 the MT7621 is built around
a dual core MIPS CPU architecture. But underneath it is what appears to
be the same 7530 switch.
The following 3 patches are more of an RFC than anything. They allow
use of the mt7530 dsa driver on this device - though with some issues
still to resolve. The primary change required is to not use the 7623
specific clock and regulator setup - none of that applies when using
the 7621 (and maybe other devices?). The other change required is to
set the 7530 MFC register CPU port number and enable bit.
Hi Greg,
Good to see that more people are working on the MT7621 device [1].
So I added Bjorn to the CC.
I am also working on this but on the OpenWRT side.
My current code works for a Ubiquiti EdgeRouter X SFP. See kernel [2],
openwrt [3]
Current status:
Using OpenWRT provided mainline v4.14 driver MT7530 and MT7623.
I patches so that MT7621 is supported.
This means DSA part is also working, internal and external phys are detected.
I can use all of the five RJ45 ports and also MT7520 switch port 5
which connects to a external phy (at8033) for the SFP port.
Last added TRGMII part also seems to work but with issues, see below.
Openwrt uses port 5 as wan and gets a dhcp lease.
Issues:
- I can't get 2nd GMAC talk to external phy. I have tried many many
knobs but without success.
GMAC seems to work but no data is transmitted/received over the cable.
But I think this can be done later on. Adding basic support for
MT7621 is good start.
- Ethernet driver expects that the macs are initialized so that the
mtk_hw_init can setup the hardware registers.
But they are not. See [4]
I don't know how to fix this. For the current code it is not an
issue. It still works.
But it should be fixed.
Because of this I can't read the mac0 "phy-mode". I need this info
to setup the tgrmii clock at hardware init.
- Ethernet speed is unstable ~30-100mbit. I think I broke something. I
have seems 1gbit before.
I hope that this can help you the get a step further.
Greats,
René
[1] https://lists.openwrt.org/pipermail/openwrt-devel/2018-August/013614.html
[2] https://github.com/vDorst/linux-1/commits/mt7621-dsa-trgmii
[3] https://github.com/vDorst/openwrt/commits/mt7621-dsa-trgmii
[4]
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/drivers/net/ethernet/mediatek/mtk_eth_soc.c?h=v4.14.84#n1946
