Modified RTD env to include submodules and build cell docs

Signed-off-by: Wojciech Gryncewicz <wgryncewicz@antmicro.com>

.readthedocs.yml

@@ -31,4 +31,9 @@ conda:
 submodules:
   include:
    - libraries/sky130_fd_io/latest
+   - libraries/sky130_fd_sc_hd/latest
+   - libraries/sky130_fd_sc_hdll/latest
+   - libraries/sky130_fd_sc_hs/latest
+   - libraries/sky130_fd_sc_ls/latest
+   - libraries/sky130_fd_sc_ms/latest
   recursive: false

docs/_ext/skywater_pdk

@@ -0,0 +1 @@
+../../scripts/python-skywater-pdk/skywater_pdk/

docs/conf.py

@@ -31,9 +31,9 @@
 import docutils
 import os
 import re
-# import sys
+import sys
 # sys.path.insert(0, os.path.abspath('.'))
-
+sys.path.insert(0, os.path.abspath('./_ext'))
 
 # -- Project information -----------------------------------------------------
 
@@ -65,6 +65,8 @@ extensions = [
     'sphinx.ext.napoleon',
     'sphinx.ext.todo',
     'sphinxcontrib_hdl_diagrams',
+    'skywater_pdk.cells.cross_index',
+    'skywater_pdk.cells.generate.readme',
 ]
 
 # Add any paths that contain templates here, relative to this directory.

docs/contents/cell-index.rst

@@ -0,0 +1,3 @@
+.. generate_cell_readme:: libraries/*/cells/*
+
+.. cross_index:: libraries/*

docs/contents/libraries.rst

@@ -146,3 +146,8 @@ The SKY130 currently offers two :lib_type:`build space` libraries. Build space l
 
     libraries/sky130_ef_io/README
 
+.. toctree::
+    :maxdepth: 1
+    :name: Cells in libraries cross-index
+
+    cell-index