Wcd9378 sdca codec support

Documentation/devicetree/bindings/sound/qcom,wcd9378-sdw.yaml

@@ -0,0 +1,91 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/qcom,wcd9378-sdw.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm WCD9378 (Tambora) SoundWire codec
+
+maintainers:
+  - Srinivas Kandagatla <srinivas.kandagatla@oss.qualcomm.com>
+
+description:
+  Qualcomm WCD9378 (Tambora) SoundWire codec in SDCA compute mode.
+
+properties:
+  compatible:
+    items:
+      - const: qcom,wcd9378c
+      - const: sdw20217011000
+
+  reg:
+    maxItems: 1
+
+  qcom,port-mapping:
+    description: |
+      Each entry maps a slave data port to a master data port.
+      Entries are in order starting from slave port 1; slave port 0
+      is reserved and not represented.  Compute mode uses 8 entries
+      covering DP1..DP8.
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 8
+    maxItems: 8
+
+  reset-gpios:
+    description: GPIO used to release the codec from reset.
+    maxItems: 1
+
+  vdd-buck-supply:
+    description: 1.8 V analog buck supply.
+
+  vdd-rxtx-supply:
+    description: 1.8 V RX/TX supply.
+
+  vdd-io-supply:
+    description: Digital I/O supply.
+
+  vdd-mic-bias-supply:
+    description: Mic bias supply.
+
+  '#sound-dai-cells':
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - qcom,port-mapping
+  - reset-gpios
+  - vdd-buck-supply
+  - vdd-rxtx-supply
+  - vdd-io-supply
+  - vdd-mic-bias-supply
+  - '#sound-dai-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    soundwire@7630000 {
+        reg = <0x07630000 0x10000>;
+        #address-cells = <2>;
+        #size-cells = <0>;
+
+        wcd9378c_sdw: audio-codec@0,3 {
+            compatible = "qcom,wcd9378c", "sdw20217011000";
+            reg = <0 3>;
+
+            qcom,port-mapping = <2 2 3 4 5 6 7 8>;
+
+            reset-gpios = <&tlmm 191 GPIO_ACTIVE_LOW>;
+
+            vdd-buck-supply = <&vreg_l15b_1p8>;
+            vdd-rxtx-supply = <&vreg_l15b_1p8>;
+            vdd-io-supply = <&vreg_l18b_1p2>;
+            vdd-mic-bias-supply = <&vreg_bob1>;
+
+            #sound-dai-cells = <1>;
+        };
+    };
+...

include/sound/sdca.h

@@ -60,20 +60,16 @@ enum sdca_quirk {
 	SDCA_QUIRKS_SKIP_FUNC_TYPE_PATCHING,
 };
 
-#if IS_ENABLED(CONFIG_ACPI) && IS_ENABLED(CONFIG_SND_SOC_SDCA)
+#if IS_ENABLED(CONFIG_SND_SOC_SDCA)
 
-void sdca_lookup_functions(struct sdw_slave *slave);
 void sdca_lookup_swft(struct sdw_slave *slave);
-void sdca_lookup_interface_revision(struct sdw_slave *slave);
 bool sdca_device_quirk_match(struct sdw_slave *slave, enum sdca_quirk quirk);
 int sdca_dev_register_functions(struct sdw_slave *slave);
 void sdca_dev_unregister_functions(struct sdw_slave *slave);
 
 #else
 
-static inline void sdca_lookup_functions(struct sdw_slave *slave) {}
 static inline void sdca_lookup_swft(struct sdw_slave *slave) {}
-static inline void sdca_lookup_interface_revision(struct sdw_slave *slave) {}
 static inline bool sdca_device_quirk_match(struct sdw_slave *slave, enum sdca_quirk quirk)
 {
 	return false;
@@ -88,4 +84,21 @@ static inline void sdca_dev_unregister_functions(struct sdw_slave *slave) {}
 
 #endif
 
+/*
+ * Called from the SoundWire bus during peripheral enumeration; gated on
+ * ACPI to avoid a soundwire_bus <-> snd_soc_sdca module cycle on DT builds
+ * (where the bodies are stubs anyway).
+ */
+#if IS_ENABLED(CONFIG_ACPI) && IS_ENABLED(CONFIG_SND_SOC_SDCA)
+
+void sdca_lookup_functions(struct sdw_slave *slave);
+void sdca_lookup_interface_revision(struct sdw_slave *slave);
+
+#else
+
+static inline void sdca_lookup_functions(struct sdw_slave *slave) {}
+static inline void sdca_lookup_interface_revision(struct sdw_slave *slave) {}
+
+#endif
+
 #endif

include/sound/sdca_class.h

@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * The MIPI SDCA specification is available for public downloads at
+ * https://www.mipi.org/mipi-sdca-v1-0-download
+ *
+ * Copyright (C) 2025 Cirrus Logic, Inc. and
+ *                    Cirrus Logic International Semiconductor Ltd.
+ */
+
+#ifndef __SDCA_CLASS_H__
+#define __SDCA_CLASS_H__
+
+#include <linux/completion.h>
+#include <linux/mutex.h>
+#include <linux/workqueue.h>
+
+struct device;
+struct dev_pm_ops;
+struct regmap;
+struct sdw_slave;
+struct sdca_function_data;
+
+/**
+ * struct sdca_class_ops - optional codec-provided class callbacks
+ * @populate_function: fill @function (entities, clusters, init_table, ...)
+ *           from static tables in place of sdca_parse_function() on
+ *           DT/non-DisCo platforms.  Pure data source; performs no
+ *           bus I/O.  Return 0 on success or a negative errno.
+ */
+struct sdca_class_ops {
+	int (*populate_function)(struct sdw_slave *slave,
+				 struct sdca_function_data *function);
+};
+
+struct sdca_class_drv {
+	struct device *dev;
+	struct regmap *dev_regmap;
+	struct sdw_slave *sdw;
+
+	struct sdca_interrupt_info *irq_info;
+
+	const struct sdca_class_ops *ops;
+
+	struct mutex regmap_lock;
+	/* Serialise function initialisations */
+	struct mutex init_lock;
+	struct work_struct boot_work;
+};
+
+/* Library helpers used by codec-specific SDCA SoundWire drivers. */
+int sdca_class_probe(struct sdw_slave *sdw,
+		     struct sdca_class_drv *drv,
+		     const struct sdca_class_ops *ops);
+void sdca_class_remove(struct sdca_class_drv *drv);
+
+/*
+ * PM helpers.  Codec drivers embed sdca_class_drv in their own priv,
+ * own dev_set_drvdata(), and compose these into their own dev_pm_ops:
+ *
+ *	static int wcd_runtime_suspend(struct device *dev) {
+ *		struct wcd_priv *priv = dev_get_drvdata(dev);
+ *		return sdca_class_runtime_suspend(&priv->class);
+ *	}
+ */
+int sdca_class_runtime_suspend(struct sdca_class_drv *drv);
+int sdca_class_runtime_resume(struct sdca_class_drv *drv);
+int sdca_class_system_suspend(struct sdca_class_drv *drv);
+int sdca_class_system_resume(struct sdca_class_drv *drv);
+
+#endif /* __SDCA_CLASS_H__ */

include/sound/sdca_function.h

@@ -1464,6 +1464,8 @@ static inline u32 sdca_range_search(struct sdca_control_range *range,
 
 int sdca_parse_function(struct device *dev, struct sdca_function_data *function);
 
+void sdca_apply_default_control_classifiers(struct sdca_function_data *function);
+
 const char *sdca_find_terminal_name(enum sdca_terminal_type type);
 
 struct sdca_control *sdca_selector_find_control(struct device *dev,

sound/soc/codecs/Kconfig

@@ -2526,6 +2526,17 @@ config SND_SOC_WCD939X_SDW
 	  The WCD9390/9395 is a audio codec IC Integrated in
 	  Qualcomm SoCs like SM8650.
 
+config SND_SOC_WCD9378_SDCA
+	tristate "Qualcomm Tambora (WCD9378) SDCA codec"
+	depends on SOUNDWIRE
+	depends on SND_SOC_SDCA_CLASS
+	help
+	  This enables support for the Qualcomm Tambora (WCD9378) headset
+	  codec when driven via the SDCA class driver on ARM platforms
+	  without ACPI/DisCo tables. It provides the static SDCA topology
+	  and SoundWire data port properties transcribed from the factory
+	  ACPI tables.
+
 config SND_SOC_WM0010
 	tristate
 	depends on SPI_MASTER

sound/soc/codecs/Makefile

@@ -366,6 +366,7 @@ snd-soc-wcd938x-y := wcd938x.o
 snd-soc-wcd938x-sdw-y := wcd938x-sdw.o
 snd-soc-wcd939x-y := wcd939x.o
 snd-soc-wcd939x-sdw-y := wcd939x-sdw.o
+snd-soc-wcd9378-y := wcd9378-sdw.o wcd9378-sdca.o
 snd-soc-wm-adsp-y := wm_adsp.o
 snd-soc-wm-adsp-test-y := wm_adsp_fw_find_test.o
 snd-soc-wm0010-y := wm0010.o
@@ -819,6 +820,7 @@ ifdef CONFIG_SND_SOC_WCD939X_SDW
 # avoid link failure by forcing sdw code built-in when needed
 obj-$(CONFIG_SND_SOC_WCD939X) += snd-soc-wcd939x-sdw.o
 endif
+obj-$(CONFIG_SND_SOC_WCD9378_SDCA) += snd-soc-wcd9378.o
 obj-$(CONFIG_SND_SOC_WM0010)	+= snd-soc-wm0010.o
 obj-$(CONFIG_SND_SOC_WM1250_EV1) += snd-soc-wm1250-ev1.o
 obj-$(CONFIG_SND_SOC_WM2000)	+= snd-soc-wm2000.o