Preserve datatype information when parsing dts

The current code throws away all the data type and grouping information
when parsing the DTS source file, which makes it difficult to
reconstruct the data format when emitting a format that can express data
types (ie. dts and yaml). Use the marker structure to mark the beginning
of each integer array block (<> and []), and the datatype contained in
each (8, 16, 32 & 64 bit widths).

Signed-off-by: Grant Likely <grant.likely@arm.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
[robh: s/MARKER_/TYPE_/]
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

data.c

@@ -74,7 +74,8 @@ struct data data_copy_escape_string(const char *s, int len)
 	struct data d;
 	char *q;
 
-	d = data_grow_for(empty_data, len + 1);
+	d = data_add_marker(empty_data, TYPE_STRING, NULL);
+	d = data_grow_for(d, len + 1);
 
 	q = d.val;
 	while (i < len) {
@@ -94,6 +95,7 @@ struct data data_copy_file(FILE *f, size_t maxlen)
 {
 	struct data d = empty_data;
 
+	d = data_add_marker(d, TYPE_BLOB, NULL);
 	while (!feof(f) && (d.len < maxlen)) {
 		size_t chunksize, ret;
 

dtc-parser.y

@@ -340,22 +340,27 @@ arrayprefix:
 	DT_BITS DT_LITERAL '<'
 		{
 			unsigned long long bits;
+			enum markertype type = TYPE_UINT32;
 
 			bits = $2;
 
-			if ((bits !=  8) && (bits != 16) &&
-			    (bits != 32) && (bits != 64)) {
+			switch (bits) {
+			case 8: type = TYPE_UINT8; break;
+			case 16: type = TYPE_UINT16; break;
+			case 32: type = TYPE_UINT32; break;
+			case 64: type = TYPE_UINT64; break;
+			default:
 				ERROR(&@2, "Array elements must be"
 				      " 8, 16, 32 or 64-bits");
 				bits = 32;
 			}
 
-			$$.data = empty_data;
+			$$.data = data_add_marker(empty_data, type, NULL);
 			$$.bits = bits;
 		}
 	| '<'
 		{
-			$$.data = empty_data;
+			$$.data = data_add_marker(empty_data, TYPE_UINT32, NULL);
 			$$.bits = 32;
 		}
 	| arrayprefix integer_prim
@@ -499,7 +504,7 @@ integer_unary:
 bytestring:
 	  /* empty */
 		{
-			$$ = empty_data;
+			$$ = data_add_marker(empty_data, TYPE_UINT8, NULL);
 		}
 	| bytestring DT_BYTE
 		{

dtc.h

@@ -77,7 +77,14 @@ enum markertype {
 	REF_PHANDLE,
 	REF_PATH,
 	LABEL,
+	TYPE_UINT8,
+	TYPE_UINT16,
+	TYPE_UINT32,
+	TYPE_UINT64,
+	TYPE_BLOB,
+	TYPE_STRING,
 };
+extern const char *markername(enum markertype markertype);
 
 struct  marker {
 	enum markertype type;