linux-kernel - [REGRESSION] in 6.18-rc1, failed to query a GPIO using a name in ACPI

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Message-ID: <c321423b-3cdb-41a5-9939-dc5c846cfcd4@bootlin.com>
Date: Thu, 16 Oct 2025 14:47:40 +0200
From: Thomas Richard <thomas.richard@...tlin.com>
To: rafael@...nel.org
Cc: regressions@...ts.linux.dev, lenb@...nel.org, linux-acpi@...r.kernel.org,
 linux-kernel@...r.kernel.org,
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 sunilvl@...tanamicro.com, apatel@...tanamicro.com,
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
 Daniele Cleri <DanieleCleri@...on.eu>
Subject: [REGRESSION] in 6.18-rc1, failed to query a GPIO using a name in ACPI

Hello,

While testing the AAEON UpBoard MFD driver with the v6.18-rc1 release, I
noticed a regression. The driver does not probe anymore and I get the
following error:

[    1.977831] upboard-fpga AANT0F01:00: error -ENOENT: Failed to
initialize FPGA common GPIOs
[    1.977854] upboard-fpga AANT0F01:00: probe with driver upboard-fpga
failed with error -2

The driver fails to get some GPIOs using a name [1] in the ACPI tables [2].

I did a bisect and I found the commit which introduced the regression:
e121be784d35 ("ACPI: property: Refactor acpi_fwnode_get_reference_args()
to support nargs_prop")

Best Regards,

Thomas

[1]
https://elixir.bootlin.com/linux/v6.17/source/drivers/mfd/upboard-fpga.c#L192
[2] https://gist.github.com/thom24/2da44ef86eacfa5d2d492ce43fa41aa4