Tab5 power expander driver and devicetree parsing improvements (#507)

* **New Features**
  * PI4IOE5V6408 I2C I/O expander driver with public GPIO APIs
  * CLI tool to list devicetree dependencies

* **Device Tree Updates**
  * M5Stack Tab5 configured with two I2C IO expanders; PI4IOE5V6408 binding added

* **Build / Tooling**
  * Devicetree code generation integrated into build; generated artifacts and dynamic dependency resolution exposed

* **Refactor**
  * Kernel/run APIs updated to accept a null‑terminated devicetree modules array; many module symbols renamed

* **Documentation**
  * Added README and Apache‑2.0 license for new driver module

Firmware/CMakeLists.txt

@@ -2,17 +2,47 @@ cmake_minimum_required(VERSION 3.20)
 
 file(GLOB_RECURSE SOURCE_FILES "Source/*.c*")
 
-# For Generate target below
+get_filename_component(PROJECT_ROOT "${CMAKE_CURRENT_LIST_DIR}/.." ABSOLUTE)
+
+# Get the project and device id
 if (DEFINED ENV{ESP_IDF_VERSION})
     include("../Buildscripts/device.cmake")
     init_tactility_globals("../sdkconfig")
     get_property(TACTILITY_DEVICE_PROJECT GLOBAL PROPERTY TACTILITY_DEVICE_PROJECT)
+    get_property(TACTILITY_DEVICE_ID GLOBAL PROPERTY TACTILITY_DEVICE_ID)
 else ()
     set(TACTILITY_DEVICE_ID simulator)
     set(COMPONENT_LIB FirmwareSim)
+    set(TACTILITY_DEVICE_PROJECT Simulator)
 endif ()
 
-set(DEVICETREE_LOCATION "${CMAKE_SOURCE_DIR}/Devices/${TACTILITY_DEVICE_ID}")
+set(DEVICETREE_LOCATION "${PROJECT_ROOT}/Devices/${TACTILITY_DEVICE_ID}")
+
+#
+# DTS compiler python dependencies
+#
+
+execute_process(
+    COMMAND python -m pip install lark==1.3.1 pyyaml==6.0.3
+    WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
+)
+
+#
+# Devicetree dependency collection
+#
+
+execute_process(
+    COMMAND python "${PROJECT_ROOT}/Buildscripts/DevicetreeCompiler/dependencies.py" "${DEVICETREE_LOCATION}"
+    WORKING_DIRECTORY "${PROJECT_ROOT}"
+    OUTPUT_VARIABLE DEVICE_DEPENDENCIES
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+)
+# Tokenize to array of lines
+separate_arguments(DEVICE_DEPENDENCIES UNIX_COMMAND "${DEVICE_DEPENDENCIES}")
+
+#
+# "Generated/" directory creation
+#
 
 set(GENERATED_DIR "${CMAKE_CURRENT_BINARY_DIR}/Generated")
 # Ensure the directory is built in the correct CMake build phase
@@ -21,37 +51,53 @@ if (DEFINED CMAKE_CURRENT_BINARY_DIR)
     file(MAKE_DIRECTORY "${GENERATED_DIR}")
 endif ()
 
+#
+# Component
+#
+
+list(APPEND REQUIRES_LIST
+    Tactility
+    TactilityKernel
+)
+
+# Add devicetree dependencies
+foreach(dts_dependency IN LISTS DEVICE_DEPENDENCIES)
+    message("Adding DTS dependency ${dts_dependency}")
+    list(APPEND REQUIRES_LIST ${dts_dependency})
+endforeach()
+
 if (DEFINED ENV{ESP_IDF_VERSION})
+    list(APPEND REQUIRES_LIST
+        TactilityC
+    )
 
     idf_component_register(
         SRCS ${SOURCE_FILES} "${GENERATED_DIR}/devicetree.c"
-        REQUIRES Tactility TactilityC TactilityKernel platform-esp32 ${TACTILITY_DEVICE_PROJECT}
+        REQUIRES ${REQUIRES_LIST}
     )
-
 else ()
-
-    add_executable(FirmwareSim ${SOURCE_FILES} "${GENERATED_DIR}/devicetree.c")
-    target_link_libraries(FirmwareSim PRIVATE
-        Tactility
+    list(APPEND REQUIRES_LIST
         TactilityCore
         TactilityFreeRtos
-        TactilityKernel
         hal-device-module
         lvgl-module
-        Simulator
-        platform-posix
-        SDL2::SDL2-static SDL2-static
+        SDL2::SDL2-static
+        SDL2-static
     )
-
+    add_executable(FirmwareSim ${SOURCE_FILES} "${GENERATED_DIR}/devicetree.c")
+    target_link_libraries(FirmwareSim PRIVATE ${REQUIRES_LIST})
 endif ()
 
+#
+# Devicetree code generation
+#
+
 add_custom_target(AlwaysRun
     COMMAND ${CMAKE_COMMAND} -E rm -f "${GENERATED_DIR}/devicetree.c"
 )
 add_custom_command(
     OUTPUT "${GENERATED_DIR}/devicetree.c"
         "${GENERATED_DIR}/devicetree.h"
-    COMMAND pip install lark==1.3.1 pyyaml==6.0.3
     COMMAND python "${CMAKE_SOURCE_DIR}/Buildscripts/DevicetreeCompiler/compile.py"
         "${DEVICETREE_LOCATION}" "${GENERATED_DIR}"
     WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"