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charset="utf-8" Add new property: cirrus,subsystem-id This new property is used to uniquely identify the system if device tree is used, to allow the driver to select the correct firmware and tuning for the system. Signed-off-by: Stefan Binding --- Documentation/devicetree/bindings/sound/cirrus,cs35l41.yaml | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/devicetree/bindings/sound/cirrus,cs35l41.yaml b/= Documentation/devicetree/bindings/sound/cirrus,cs35l41.yaml index 14dea1feefc5..e6cf2ebcd777 100644 --- a/Documentation/devicetree/bindings/sound/cirrus,cs35l41.yaml +++ b/Documentation/devicetree/bindings/sound/cirrus,cs35l41.yaml @@ -151,6 +151,12 @@ properties: minimum: 0 maximum: 5 =20 + cirrus,subsystem-id: + $ref: /schemas/types.yaml#/definitions/string + description: + Subsystem ID. 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Fri, 12 Sep 2025 15:48:09 +0000 (UTC) From: Stefan Binding To: Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-sound@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, patches@opensource.cirrus.com, Stefan Binding Subject: [PATCH v2 2/2] ASoC: cs35l41: Fallback to reading Subsystem ID property if not ACPI Date: Fri, 12 Sep 2025 16:47:45 +0100 Message-ID: <20250912154759.279661-3-sbinding@opensource.cirrus.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250912154759.279661-1-sbinding@opensource.cirrus.com> References: <20250912154759.279661-1-sbinding@opensource.cirrus.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000044F0:EE_|SJ1PR19MB8285:EE_ X-MS-Office365-Filtering-Correlation-Id: ecd33d5f-a47a-490c-4f4b-08ddf213c733 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|82310400026|376014|61400799027; 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charset="utf-8" If ACPI is not used, then there is currently no way of reading a Subsystem ID property used for a system name to uniquely identify the system in order to load the correct firmware and tuning. Add a new property which can be read from device tree to be able to set the system name. Signed-off-by: Stefan Binding --- sound/soc/codecs/cs35l41.c | 77 ++++++++++++++++++++++---------------- 1 file changed, 44 insertions(+), 33 deletions(-) diff --git a/sound/soc/codecs/cs35l41.c b/sound/soc/codecs/cs35l41.c index 224d65987a8d..d7e3d89de652 100644 --- a/sound/soc/codecs/cs35l41.c +++ b/sound/soc/codecs/cs35l41.c @@ -7,6 +7,7 @@ // Author: David Rhodes =20 #include +#include #include #include #include @@ -1147,45 +1148,55 @@ static int cs35l41_dsp_init(struct cs35l41_private = *cs35l41) return ret; } =20 -#ifdef CONFIG_ACPI -static int cs35l41_acpi_get_name(struct cs35l41_private *cs35l41) +static int cs35l41_get_system_name(struct cs35l41_private *cs35l41) { struct acpi_device *adev =3D ACPI_COMPANION(cs35l41->dev); - acpi_handle handle =3D acpi_device_handle(adev); - const char *hid; - const char *sub; - - /* If there is no acpi_device, there is no ACPI for this system, return 0= */ - if (!adev) - return 0; + const char *sub =3D NULL; + const char *tmp; + int ret =3D 0; =20 - sub =3D acpi_get_subsystem_id(handle); - if (IS_ERR(sub)) { - /* If no _SUB, fallback to _HID, otherwise fail */ - if (PTR_ERR(sub) =3D=3D -ENODATA) { - hid =3D acpi_device_hid(adev); - /* If dummy hid, return 0 and fallback to legacy firmware path */ - if (!strcmp(hid, "device")) - return 0; - sub =3D kstrdup(hid, GFP_KERNEL); - if (!sub) - sub =3D ERR_PTR(-ENOMEM); - - } else - return PTR_ERR(sub); + /* If there is no acpi_device, there is no ACPI for this system, skip che= cking ACPI */ + if (adev) { + acpi_handle handle =3D acpi_device_handle(adev); + + sub =3D acpi_get_subsystem_id(handle); + ret =3D PTR_ERR(sub); + if (ret) { + sub =3D NULL; + /* If no _SUB, fallback to _HID, otherwise fail */ + if (ret =3D=3D -ENODATA) { + tmp =3D acpi_device_hid(adev); + /* If dummy hid, return 0 and fallback to legacy firmware path */ + if (!strcmp(tmp, "device")) { + ret =3D 0; + goto err; + } + sub =3D kstrdup(tmp, GFP_KERNEL); + if (!sub) { + ret =3D -ENOMEM; + goto err; + } + } + } + } else { + if (!device_property_read_string(cs35l41->dev, "cirrus,subsystem-id", &t= mp)) { + sub =3D kstrdup(tmp, GFP_KERNEL); + if (!sub) { + ret =3D -ENOMEM; + goto err; + } + } } =20 - cs35l41->dsp.system_name =3D sub; - dev_dbg(cs35l41->dev, "Subsystem ID: %s\n", cs35l41->dsp.system_name); +err: + if (sub) { + cs35l41->dsp.system_name =3D sub; + dev_info(cs35l41->dev, "Subsystem ID: %s\n", cs35l41->dsp.system_name); + } else + dev_warn(cs35l41->dev, "Subsystem ID not found\n"); =20 - return 0; -} -#else -static int cs35l41_acpi_get_name(struct cs35l41_private *cs35l41) -{ - return 0; + return ret; } -#endif /* CONFIG_ACPI */ =20 int cs35l41_probe(struct cs35l41_private *cs35l41, const struct cs35l41_hw= _cfg *hw_cfg) { @@ -1317,7 +1328,7 @@ int cs35l41_probe(struct cs35l41_private *cs35l41, co= nst struct cs35l41_hw_cfg * goto err; } =20 - ret =3D cs35l41_acpi_get_name(cs35l41); + ret =3D cs35l41_get_system_name(cs35l41); if (ret < 0) goto err; =20 --=20 2.43.0