linux-kernel - [PATCH v2 0/2] Support reading Subsystem ID from Device Tree

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Message-ID: <20250912154759.279661-1-sbinding@opensource.cirrus.com>
Date: Fri, 12 Sep 2025 16:47:43 +0100
From: Stefan Binding <sbinding@...nsource.cirrus.com>
To: Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc: linux-sound@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, patches@...nsource.cirrus.com,
        Stefan Binding <sbinding@...nsource.cirrus.com>
Subject: [PATCH v2 0/2] Support reading Subsystem ID from Device Tree

In PC systems using ACPI, the driver is able to read back an SSID from
the _SUB property. This SSID uniquely identifies the system, which
enables the driver to read the correct firmware and tuning for that
system from linux-firmware. Currently there is no way of reading this
property from device tree. Add an equivalent property in device tree
to perform the same role.

Changes since v1:
- Fixed device tree property type

Stefan Binding (2):
  ASoC: dt-bindings: cirrus,cs35l41: Document the cirrus,subsystem-id
    property
  ASoC: cs35l41: Fallback to reading Subsystem ID property if not ACPI

 .../bindings/sound/cirrus,cs35l41.yaml        |  6 ++
 sound/soc/codecs/cs35l41.c                    | 77 +++++++++++--------
 2 files changed, 50 insertions(+), 33 deletions(-)

-- 
2.43.0