[Add] 打通Kconfiglib配置操作

scripts/kconfig/Kconfiglib/examples/print_sym_info.py

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+# Loads a Kconfig and a .config and prints a symbol.
+#
+# Usage:
+#
+#   $ make [ARCH=<arch>] scriptconfig SCRIPT=Kconfiglib/examples/print_sym_info.py SCRIPT_ARG=<name>
+#
+# Example output for SCRIPT_ARG=MODULES:
+#
+# menuconfig MODULES
+# 	bool
+# 	prompt "Enable loadable module support"
+# 	option modules
+# 	help
+# 	  Kernel modules are small pieces of compiled code which can
+# 	  be inserted in the running kernel, rather than being
+# 	  permanently built into the kernel.  You use the "modprobe"
+# 	  tool to add (and sometimes remove) them.  If you say Y here,
+# 	  many parts of the kernel can be built as modules (by
+# 	  answering M instead of Y where indicated): this is most
+# 	  useful for infrequently used options which are not required
+# 	  for booting.  For more information, see the man pages for
+# 	  modprobe, lsmod, modinfo, insmod and rmmod.
+#
+# 	  If you say Y here, you will need to run "make
+# 	  modules_install" to put the modules under /lib/modules/
+# 	  where modprobe can find them (you may need to be root to do
+# 	  this).
+#
+# 	  If unsure, say Y.
+#
+# value = n
+# visibility = y
+# currently assignable values: n, y
+# defined at init/Kconfig:1674
+
+import sys
+
+from kconfiglib import Kconfig, TRI_TO_STR
+
+
+if len(sys.argv) < 3:
+    sys.exit('Pass symbol name (without "CONFIG_" prefix) with SCRIPT_ARG=<name>')
+
+kconf = Kconfig(sys.argv[1])
+sym = kconf.syms[sys.argv[2]]
+
+print(sym)
+print("value = " + sym.str_value)
+print("visibility = " + TRI_TO_STR[sym.visibility])
+print("currently assignable values: " +
+      ", ".join([TRI_TO_STR[v] for v in sym.assignable]))
+
+for node in sym.nodes:
+    print("defined at {}:{}".format(node.filename, node.linenr))