Audio: template_comp: Add a new SOF template component

This patch contains all needed to add a new minimal SOF component
to FW build for TGL and more recent platforms plus sof-testbench4
simulation.

the component name is template_comp and it is easy to duplicate
for new component development from scratch.

The component supports one switch kcontrol. When enabled the
component swaps or reverses the channels order if there are two
or more channels.

Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>

Author: singalsu

src/audio/CMakeLists.txt

@@ -115,6 +115,9 @@ if(NOT CONFIG_COMP_MODULE_SHARED_LIBRARY_BUILD)
 		list(APPEND base_files host-legacy.c)
 		sof_list_append_ifdef(CONFIG_COMP_DAI base_files dai-legacy.c)
 	endif()
+	if(CONFIG_COMP_TEMPLATE_COMP)
+		add_subdirectory(template_comp)
+	endif()
 endif()
 
 ### Common files (also used in shared library build)

src/audio/Kconfig

@@ -164,6 +164,8 @@ rsource "mfcc/Kconfig"
 
 rsource "codec/Kconfig"
 
+rsource "template_comp/Kconfig"
+
 endmenu # "Audio components"
 
 menu "Data formats"

src/audio/template_comp/CMakeLists.txt

@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: BSD-3-Clause
+
+if(CONFIG_COMP_TEMPLATE_COMP STREQUAL "m")
+  add_subdirectory(llext ${PROJECT_BINARY_DIR}/template_comp_llext)
+  add_dependencies(app template_comp)
+else()
+  add_local_sources(sof template_comp.c)
+endif()

src/audio/template_comp/Kconfig

@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: BSD-3-Clause
+
+config COMP_TEMPLATE_COMP
+	tristate "Template_Comp component"
+	default y
+	help
+	  Select for template_comp component. Reason for existence
+	  is a minimal component example and possible use as
+	  placeholder in processing pipelines. As example processing
+	  it swaps or reverses the channels when the control switch
+	  is enabled.

src/audio/template_comp/llext/CMakeLists.txt

@@ -0,0 +1,7 @@
+# Copyright (c) 2025 Intel Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+sof_llext_build("template_comp"
+	SOURCES ../template_comp.c
+	LIB openmodules
+)

src/audio/template_comp/llext/llext.toml.h

@@ -0,0 +1,6 @@
+#include <tools/rimage/config/platform.toml>
+#define LOAD_TYPE "2"
+#include "../template_comp.toml"
+
+[module]
+count = __COUNTER__