dtoc: Support ACPI paths in of-platdata

The start of an ACPI path typically has backslashes in it. These are not
preserved during the translation from device tree to C code, since dtc
(correctly) uses the first backslash as an escape character, and dtoc
therefore leaves it out of the C string.

Fix this with special-case handling.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/dtoc/dtb_platdata.py

@@ -104,7 +104,9 @@ def get_value(ftype, value):
     elif ftype == fdt.TYPE_BYTE:
         return '%#x' % tools.ToByte(value[0])
     elif ftype == fdt.TYPE_STRING:
-        return '"%s"' % value
+        # Handle evil ACPI backslashes by adding another backslash before them.
+        # So "\\_SB.GPO0" in the device tree effectively stays like that in C
+        return '"%s"' % value.replace('\\', '\\\\')
     elif ftype == fdt.TYPE_BOOL:
         return 'true'
     elif ftype == fdt.TYPE_INT64: