[RFC PATCH 2/8] ASoC: SDCA: allow building without ACPI

[Srinivas Kandagatla]

The SDCA class driver is useful on non-ACPI platforms where the
topology is supplied statically via sdca_class_hw_ops.get_function_data.

Drop 'depends on ACPI' from SND_SOC_SDCA and guard the
ACPI-parsing implementations in sdca_device.c and sdca_functions.c
with IS_ENABLED(CONFIG_ACPI), providing empty stubs when ACPI is off.

Assisted-by: Claude:claude-opus-4-7
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxxxxxxxx>
---
 include/sound/sdca.h            | 2 +-
 sound/soc/sdca/Kconfig          | 6 ++++--
 sound/soc/sdca/sdca_device.c    | 4 ++++
 sound/soc/sdca/sdca_functions.c | 4 ++++
 4 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/include/sound/sdca.h b/include/sound/sdca.h
index 2bdf4e333e04..c449b10ef893 100644
--- a/include/sound/sdca.h
+++ b/include/sound/sdca.h
@@ -60,7 +60,7 @@ 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);
diff --git a/sound/soc/sdca/Kconfig b/sound/soc/sdca/Kconfig
index 4c0dcb9ff3b9..dc4cba1e3e0e 100644
--- a/sound/soc/sdca/Kconfig
+++ b/sound/soc/sdca/Kconfig
@@ -3,11 +3,13 @@ menu "SoundWire (SDCA)"
 
 config SND_SOC_SDCA
 	tristate "SDCA core support"
-	depends on ACPI
 	select AUXILIARY_BUS
 	help
 	  This option enables support for the MIPI SoundWire Device
-	  Class for Audio (SDCA).
+	  Class for Audio (SDCA).  The ACPI/DisCo topology parser is
+	  only built when CONFIG_ACPI is enabled; on non-ACPI platforms
+	  (e.g. ARM/DT) codec drivers supply the SDCA function data
+	  via sdca_class_hw_ops.get_function_data.
 
 config SND_SOC_SDCA_HID
 	bool "SDCA HID support"
diff --git a/sound/soc/sdca/sdca_device.c b/sound/soc/sdca/sdca_device.c
index 405e80b979de..59d6c7466d91 100644
--- a/sound/soc/sdca/sdca_device.c
+++ b/sound/soc/sdca/sdca_device.c
@@ -28,6 +28,7 @@ void sdca_lookup_interface_revision(struct sdw_slave *slave)
 }
 EXPORT_SYMBOL_NS(sdca_lookup_interface_revision, "SND_SOC_SDCA");
 
+#if IS_ENABLED(CONFIG_ACPI)
 static void devm_acpi_table_put(void *ptr)
 {
 	acpi_put_table((struct acpi_table_header *)ptr);
@@ -45,6 +46,9 @@ void sdca_lookup_swft(struct sdw_slave *slave)
 		devm_add_action_or_reset(&slave->dev, devm_acpi_table_put,
 					 &slave->sdca_data.swft);
 }
+#else
+void sdca_lookup_swft(struct sdw_slave *slave) { }
+#endif
 EXPORT_SYMBOL_NS(sdca_lookup_swft, "SND_SOC_SDCA");
 
 static bool sdca_device_quirk_rt712_vb(struct sdw_slave *slave)
diff --git a/sound/soc/sdca/sdca_functions.c b/sound/soc/sdca/sdca_functions.c
index 77940bd6b33c..8814adc05f04 100644
--- a/sound/soc/sdca/sdca_functions.c
+++ b/sound/soc/sdca/sdca_functions.c
@@ -25,6 +25,7 @@
  */
 #define SDCA_PROPERTY_LENGTH 64
 
+#if IS_ENABLED(CONFIG_ACPI)
 static int patch_sdca_function_type(u32 interface_revision, u32 *function_type)
 {
 	/*
@@ -198,6 +199,9 @@ void sdca_lookup_functions(struct sdw_slave *slave)
 
 	acpi_dev_for_each_child(adev, find_sdca_function, &slave->sdca_data);
 }
+#else
+void sdca_lookup_functions(struct sdw_slave *slave) { }
+#endif
 EXPORT_SYMBOL_NS(sdca_lookup_functions, "SND_SOC_SDCA");
 
 struct raw_init_write {
-- 
2.53.0