linux-kernel - BUG: devm_regulator_get returns EPROBE_DEFER (5.3-rc5..next-20190822) for bpi-r2/mt7623/mt7530

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Message-ID: <trinity-584a4b1c-18c9-43ae-8c1a-5057933ad905-1566501837738@3c-app-gmx-bs43>
Date:   Thu, 22 Aug 2019 21:23:57 +0200
From:   "Frank Wunderlich" <frank-w@...lic-files.de>
To:     "Liam Girdwood" <lgirdwood@...il.com>
Cc:     "Mark Brown" <broonie@...nel.org>, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        "René van Dorst" <opensource@...rst.com>
Subject: BUG: devm_regulator_get returns EPROBE_DEFER
 (5.3-rc5..next-20190822) for bpi-r2/mt7623/mt7530

Hi,

i've encountered a bug in regulator between 5.3-rc5 and next-20190822

i build for bananapi-r2/mt7623 using this branch (includes next-patches):

https://github.com/vDorst/linux-1/blob/c34582d96520566c45068b92e080620458ffc1ff/arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts#L166

and noticed that switch does not came up

priv->core_pwr = devm_regulator_get(&mdiodev->dev, "core"); returns 517

located here:
https://github.com/vDorst/linux-1/blob/c34582d96520566c45068b92e080620458ffc1ff/drivers/net/dsa/mt7530.c#L1590

#define EPROBE_DEFER 517/* Driver requests probe retry */

https://elixir.bootlin.com/linux/latest/source/drivers/regulator/core.c#L1726

seems of_find_regulator_by_node(node); is failing here, but i see the dts-node (mt6323_vpa_reg: buck_vpa) in /sys/firmware/devicetree/...

tried without next-patches and switch came up including dsa-ports.

i found no commit yet which breaks the regulator-setup

any idea about this?

regards Frank