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Message-ID: <20220622130730.1573747-1-sbinding@opensource.cirrus.com>
Date: Wed, 22 Jun 2022 14:07:28 +0100
From: Stefan Binding <sbinding@...nsource.cirrus.com>
To: "Rafael J . Wysocki" <rafael@...nel.org>,
Len Brown <lenb@...nel.org>, Mark Brown <broonie@...nel.org>,
Liam Girdwood <lgirdwood@...il.com>
CC: <linux-acpi@...r.kernel.org>, <alsa-devel@...a-project.org>,
<linux-kernel@...r.kernel.org>, <patches@...nsource.cirrus.com>,
Stefan Binding <sbinding@...nsource.cirrus.com>
Subject: [PATCH v1 0/2] Read _SUB from ACPI to be able to identify firmware
CS35L41 has a DSP which is able to run firmware, as well as a tuning file.
Different systems may want to use different firmwares and tuning files, and
some firmwares/tunings may not be compatible with other systems.
To allow a system to select the correct fimware/tuning, we can read an _SUB
from the ACPI. This _SUB can then be used to uniquely identify the system
in the firmware/tuning file name.
Add a helper function which reads the _SUB, so this can be used by other
parts in the future.
Add support inside the CS35L41 ASoC driver to read this _SUB, and save it
appropriately.
Stefan Binding (2):
ACPI: utils: Add api to read _SUB from ACPI
ASoC: cs35l41: Read System Name from ACPI _SUB to identify firmware
drivers/acpi/utils.c | 26 ++++++++++++++++++++++++++
include/linux/acpi.h | 8 ++++++++
sound/soc/codecs/cs35l41.c | 27 +++++++++++++++++++++++++++
3 files changed, 61 insertions(+)
--
2.25.1
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