Re: [PATCH 2/2] ASoC: cs35l56: Read firmware uuid from a device property instead of _SUB

From: Richard Fitzgerald
Date: Wed Aug 16 2023 - 13:10:48 EST


On 16/8/23 18:03, Mark Brown wrote:
On Wed, Aug 16, 2023 at 05:49:06PM +0100, Richard Fitzgerald wrote:
From: Maciej Strozek <mstrozek@xxxxxxxxxxxxxxxxxxxxx>

Use a device property "cirrus,firmware-uid" to get the unique firmware
identifier instead of using ACPI _SUB.

There will not usually be a _SUB in Soundwire nodes. The ACPI can use a
_DSD section for custom properties.

There is also a need to support instantiating this driver using software
nodes. This is for systems where the CS35L56 is a back-end device and the
ACPI refers only to the front-end audio device - there will not be any ACPI
references to CS35L56.

Are there any existing systems (or might there be given that the driver
is in released kernels already) which rely on _SUB?

No. Nothing has been released with CS35L56.