netdev - MT7621 ethernet does not get probed on net-next branch after 5.15 merge

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Message-ID: <CALW65jbKsDGTXghqQFQe2CxYbWPakkaeFrr+3vAA4gAPjeeL2w@mail.gmail.com>
Date:   Fri, 15 Oct 2021 22:23:17 +0800
From:   DENG Qingfang <dqfext@...il.com>
To:     netdev <netdev@...r.kernel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Siddhant Gupta <siddhantgupta416@...il.com>,
        Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>,
        Sergio Paracuellos <sergio.paracuellos@...il.com>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>, Felix Fietkau <nbd@....name>,
        John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        Russell King <linux@...linux.org.uk>,
        Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        René van Dorst <opensource@...rst.com>
Cc:     openwrt-devel@...ts.openwrt.org
Subject: MT7621 ethernet does not get probed on net-next branch after 5.15 merge

Hi,

After the merge of 5.15.y into net-next, MT7621 ethernet
(mtk_eth_soc.c) does not get probed at all.

Kernel log before 5.15 merge:
...
libphy: Fixed MDIO Bus: probed
libphy: mdio: probed
mt7530 mdio-bus:1f: MT7530 adapts as multi-chip module
mtk_soc_eth 1e100000.ethernet eth0: mediatek frame engine at 0xbe100000, irq 20
mt7621-pci 1e140000.pcie: host bridge /pcie@...40000 ranges:
...

Kernel log after 5.15 merge:
...
libphy: Fixed MDIO Bus: probed
mt7621-pci 1e140000.pcie: host bridge /pcie@...40000 ranges:
...

I tried adding debug prints into the .mtk_probe function, but it did
not execute.
There are no dts changes for MT7621 between 5.14 and 5.15, so I
believe it should be something else.

Any ideas?