fdt: Add fdtdec_get_uint64 to decode a 64-bit value from a property

It decodes a 64-bit value from a property that is at least 8 bytes long. Signed-off-by: Che-Liang Chiou <clchiou@chromium.org> Signed-off-by: Simon Glass <sjg@chromium.org>

fdt: Add fdtdec_get_uint64 to decode a 64-bit value from a property
It decodes a 64-bit value from a property that is at least 8 bytes long. Signed-off-by: Che-Liang Chiou <clchiou@chromium.org> Signed-off-by: Simon Glass <sjg@chromium.org>
Che-Liang Chiou · Gerald Van Baren
1 parent 79289c0b5f
Showing 2 changed files with 28 additions and 0 deletions Side-by-side Diff
include/fdtdec.h
lib/fdtdec.c
@@ -182,6 +182,21 @@
 		s32 default_val);
  
 /**
+ * Look up a 64-bit integer property in a node and return it. The property
+ * must have at least 8 bytes of data (2 cells). The first two cells are
+ * concatenated to form a 8 bytes value, where the first cell is top half and
+ * the second cell is bottom half.
+ *
+ * @param blob	FDT blob
+ * @param node	node to examine
+ * @param prop_name	name of property to find
+ * @param default_val	default value to return if the property is not found
+ * @return integer value, if found, or default_val if not
+ */
+uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
+		uint64_t default_val);
+
+/**
  * Checks whether a node is enabled.
  * This looks for a 'status' property. If this exists, then returns 1 if
  * the status is 'ok' and 0 otherwise. If there is no status property,
@@ -111,6 +111,19 @@
 	return default_val;
 }
  
+uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
+		uint64_t default_val)
+{
+	const uint64_t *cell64;
+	int length;
+
+	cell64 = fdt_getprop(blob, node, prop_name, &length);
+	if (!cell64 || length < sizeof(*cell64))
+		return default_val;
+
+	return fdt64_to_cpu(*cell64);
+}
+
 int fdtdec_get_is_enabled(const void *blob, int node)
 {
 	const char *cell;
...	...	@@ -182,6 +182,21 @@
182	182	s32 default_val);
183	183
184	184	/**
	185	+ * Look up a 64-bit integer property in a node and return it. The property
	186	+ * must have at least 8 bytes of data (2 cells). The first two cells are
	187	+ * concatenated to form a 8 bytes value, where the first cell is top half and
	188	+ * the second cell is bottom half.
	189	+ *
	190	+ * @param blob FDT blob
	191	+ * @param node node to examine
	192	+ * @param prop_name name of property to find
	193	+ * @param default_val default value to return if the property is not found
	194	+ * @return integer value, if found, or default_val if not
	195	+ */
	196	+uint64_t fdtdec_get_uint64(const void blob, int node, const char prop_name,
	197	+ uint64_t default_val);
	198	+
	199	+/**
185	200	* Checks whether a node is enabled.
186	201	* This looks for a 'status' property. If this exists, then returns 1 if
187	202	* the status is 'ok' and 0 otherwise. If there is no status property,
...	...	@@ -111,6 +111,19 @@
111	111	return default_val;
112	112	}
113	113
	114	+uint64_t fdtdec_get_uint64(const void blob, int node, const char prop_name,
	115	+ uint64_t default_val)
	116	+{
	117	+ const uint64_t *cell64;
	118	+ int length;
	119	+
	120	+ cell64 = fdt_getprop(blob, node, prop_name, &length);
	121	+ if (!cell64 \|\| length < sizeof(*cell64))
	122	+ return default_val;
	123	+
	124	+ return fdt64_to_cpu(*cell64);
	125	+}
	126	+
114	127	int fdtdec_get_is_enabled(const void *blob, int node)
115	128	{
116	129	const char *cell;