hal: microchip: mec5: Add HAL for MEC174x, MEC175x, and MECH172x.

Add a full HAL (header and peripheral C code) for Microchip "MEC5"
family SoC's: MEC174x and MEC175x. Also support the older MEC172x
whose HAL name is MECH172x. The HAL also include device tree PINCTRL
files. NOTE: This is version 0.1 of the HAL and is not feature
complete.

Signed-off-by: Scott Worley <scott.worley@microchip.com>

.gitignore

@@ -0,0 +1,11 @@
+.clangd
+.dir-locals.el
+.editorconfig
+.vscode
+# Tag files
+GPATH
+GRTAGS
+GTAGS
+TAGS
+tags
+

CMakeLists.txt

@@ -1,2 +1,3 @@
 add_subdirectory_ifdef(CONFIG_HAS_MEC_HAL mec)
-add_subdirectory_ifdef(CONFIG_HAS_MPFS_HAL mpfs)
+add_subdirectory_ifdef(CONFIG_HAS_MPFS_HAL mpfs)
+add_subdirectory_ifdef(CONFIG_HAS_MEC5_HAL mec5)

README.txt

@@ -38,4 +38,18 @@ Both are from Tag 21.08
 The following changes were made:
 
  - platform-2021.08 top folder renamed to mpfs and located at modules/hal/microchip
- - The applications/mpfs-pmp-demo/mpfs-pmp-app-u54-1/src/boards folder is copied to modules/hal/microchip/mpfs
+ - The applications/mpfs-pmp-demo/mpfs-pmp-app-u54-1/src/boards folder is copied to modules/hal/microchip/mpfs
+
+========================================================================
+Microchip MEC5 HAL for MEC1723, MEC1743 and MEC1753 CMSIS based headers
+using common peripheral headers.
+NOTE: Due to a legacy version of MEC172x with register files is in the
+zephyr tree, MEC172x is named MECH172x in  the HAL.
+
+Location:
+https://github.com/MicrochipTech/hal_microchip
+
+Refer to the mec5 subdirectory.
+
+Initial version 0.1
+