linux-kernel - [PATCH v4 0/2] DMI: Scan for DMI table from DTS info

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Message-ID: <20251031101009.704759-1-adriana@arista.com>
Date: Fri, 31 Oct 2025 03:10:07 -0700
From: adriana <adriana@...sta.com>
To: ilias.apalodimas@...aro.org,
	ardb@...nel.org,
	trini@...sulko.com
Cc: robh@...nel.org,
	krzk@...nel.org,
	jdelvare@...e.com,
	frowand.list@...il.com,
	linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	vasilykh@...sta.com,
	arm.ebbr-discuss@....com,
	boot-architecture@...ts.linaro.org,
	linux-efi@...r.kernel.org,
	uefi-discuss@...ts.uefi.org,
	linux-arm-kernel@...ts.infradead.org,
	adriana <adriana@...sta.com>
Subject: [PATCH v4 0/2] DMI: Scan for DMI table from DTS info

Some bootloaders like U-boot, particularly for the ARM architecture,
provide SMBIOS/DMI tables at a specific memory address. However, these
systems often do not boot using a full UEFI environment, which means the
kernel's standard EFI DMI scanner cannot find these tables.

This series adds support for the kernel to find these tables by
reading the associated property from the Device Tree /chosen node. The
bootloader can specify the physical addresses using the property
"linux,smbios3-entrypoint".

The first patch introduces the device tree binding documentation for this
new ABI, and the second patch implements the driver logic in dmi_scan.c.

Changes in v4:
  - Renamed linux,smbios3-table.yaml file, removed mention of ARM/ARM64
    (Patch 1/2).
  - Drop the second definition of dmi_scan_from_dt() and fold checking
    for CONFIG_OF (Patch 2/2).
  - Drop unnecessary goto on the success case (Patch 2/2).
  - Replace magic number for entrypoint size with SMBIOS3_ENTRY_POINT_SIZE
    definition (Patch 2/2).

Changes in v3:
  - Removed linux,smbios-table property, only keep the SMBIOSv3 property
    (Patch 1/2).
  - Search DT for linux,smbios3-table only, removed the code searching
    for the previous property (Patch 2/2).

Changes in v2:
  - Add missing Device Tree binding documentation (Patch 1/2).
  - Split the original patch into a 2-part series (binding + driver).
  - (No functional changes to the driver code in patch 2/2).

adriana (2):
  dt-bindings: firmware: Add binding for SMBIOS /chosen properties
  drivers: firmware: dmi_scan: Add support for reading SMBIOS from DT

 .../firmware/linux,smbios3-entrypoint.yaml    | 25 +++++++++
 drivers/firmware/dmi_scan.c                   | 54 +++++++++++++++++++
 2 files changed, 79 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/firmware/linux,smbios3-entrypoint.yaml

-- 
2.51.0