add some code

managed_components/lvgl__lvgl/docs/Makefile

@@ -0,0 +1,30 @@
+# Minimal makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line, and also
+# from the environment for the first two.
+SPHINXOPTS    ?=
+SPHINXBUILD   ?= sphinx-build
+BUILDDIR      = build
+SOURCEDIR     = intermediatex
+
+# SOURCEDIR can be overridden by LVGL_DOC_BUILD_INTERMEDIATE_DIR
+LEN           := $(shell printf '%s' '$(LVGL_DOC_BUILD_INTERMEDIATE_DIR)' | wc -c)
+
+ifeq ($(shell test $(LEN) -gt 0; echo $$?),0)
+	SOURCEDIR = $(LVGL_DOC_BUILD_INTERMEDIATE_DIR)
+else
+	SOURCEDIR = intermediate
+endif
+
+# Put it first so that "make" without argument is like "make help".
+help:
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+.PHONY: help Makefile
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
+# It can be supplied from an environment variable 'O' or on make command line.
+%: Makefile
+	$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)