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From:   Qu Wenruo <quwenruo.btrfs@gmx.com>
Subject: About the rockpi4 pcie controller failed to initialize problem in
 v5.10-rc2
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Cc:     matwey@sai.msu.ru
To:     Linux ARM <linux-arm-kernel@lists.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Message-ID: <ca6213f8-8754-f77c-e1b3-10edccf2d81a@gmx.com>
Date:   Sat, 7 Nov 2020 20:29:51 +0800
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Hi guys,

I see your awesome contribution to support Rock Pi 4B.

However in recent rc (v5.10-rc2), I found that even with `vpcie1v8` and
`vpcie0v9` added, `regulartor_dev_lookup()` now just returns
-EPROBE_DEFER, preventing rockchip pcie controller to be initialized.

The full callchain is:

rockchip_pcie_parse_host_dt()
|- rockchip>vpcie1v8 =3D devm_regulator_get_optional(dev, "vpcie1v8");
   |- _regulator_get()
      |- regulator_dev_lookup()
         |- node =3D of_get_regulartor()
         |- if (!node) {
         |-     r =3D of_find_regulator(); /* No @r found */
         |-     return ERR_PTR(-EPROBE_DEFER);

This means we can't utilize PCIE controller completely.

But strangely, `vpcie12v` and `vpcie3v3` both initialized without problem=
=2E

Any clue on how the problem could happened? I guess it's some device
tree definition went crazy, but not familiar with device tree at all.

Thanks,
Qu


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