[PATCH 02/14] fdt: Add functions to access phandles, arrays and bools

[Simon Glass]

Add a function to lookup a property which is a phandle in a node, and
another to read a fixed-length integer array from an fdt property.
Also add a function to read boolean properties.

Signed-off-by: Simon Glass <sjg at chromium.org>
---
 include/fdtdec.h |   40 ++++++++++++++++++++++++++
 lib/fdtdec.c     |   82 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 122 insertions(+), 0 deletions(-)

diff --git a/include/fdtdec.h b/include/fdtdec.h
index 9018181..9ecb6ab 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -126,3 +126,43 @@ int fdtdec_get_is_enabled(const void *blob, int node);
  * if not.
  */
 int fdtdec_check_fdt(void);
+
+/**
+ * Look up a phandle and follow it to its node. Then return the offset
+ * of that node.
+ *
+ * @param blob		FDT blob
+ * @param node		node to examine
+ * @param prop_name	name of property to find
+ * @return node offset if found, -ve error code on error
+ */
+int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name);
+
+/**
+ * Look up a property in a node and return its contents in an integer
+ * array of given length. The property must have at least enough data for
+ * the array (4*count bytes). It may have more, but this will be ignored.
+ *
+ * @param blob		FDT blob
+ * @param node		node to examine
+ * @param prop_name	name of property to find
+ * @param array		array to fill with data
+ * @param count		number of array elements
+ * @return 0 if ok, or -FDT_ERR_NOTFOUND if the property is not found,
+ *		or -FDT_ERR_BADLAYOUT if not enough data
+ */
+int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
+		int *array, int count);
+
+/**
+ * Look up a boolean property in a node and return it.
+ *
+ * A boolean properly is true if present in the device tree and false if not
+ * present, or present with a 0 value.
+ *
+ * @param blob	FDT blob
+ * @param node	node to examine
+ * @param prop_name	name of property to find
+ * @return 1 if the properly is present; 0 if it isn't present or is 0
+ */
+int fdtdec_get_bool(const void *blob, int node, const char *prop_name);
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index d1321a8..613547a 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -146,3 +146,85 @@ int fdtdec_check_fdt(void)
 			"binary or define CONFIG_OF_EMBED\n");
 	return 0;
 }
+
+int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name)
+{
+	const u32 *phandle;
+	int lookup;
+
+	phandle = fdt_getprop(blob, node, prop_name, NULL);
+	if (!phandle)
+		return -FDT_ERR_NOTFOUND;
+
+	lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle));
+	return lookup;
+}
+
+/**
+ * Look up a property in a node and check that it has a minimum length.
+ *
+ * @param blob		FDT blob
+ * @param node		node to examine
+ * @param prop_name	name of property to find
+ * @param min_len	minimum property length in bytes
+ * @param err		0 if ok, or -FDT_ERR_NOTFOUND if the property is not
+			found, or -FDT_ERR_BADLAYOUT if not enough data
+ * @return pointer to cell, which is only valid if err == 0
+ */
+static const void *get_prop_len(const void *blob, int node,
+		const char *prop_name, int min_len, int *err)
+{
+	const void *cell;
+	int len;
+
+	debug("%s: %s\n", __func__, prop_name);
+	cell = fdt_getprop(blob, node, prop_name, &len);
+	if (!cell)
+		*err = -FDT_ERR_NOTFOUND;
+	else if (len < min_len)
+		*err = -FDT_ERR_BADLAYOUT;
+	else
+		*err = 0;
+	return cell;
+}
+
+int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
+		int *array, int count)
+{
+	const s32 *cell;
+	int i, err = 0;
+
+	debug("%s: %s\n", __func__, prop_name);
+	cell = get_prop_len(blob, node, prop_name, sizeof(s32) * count, &err);
+	if (!err) {
+		for (i = 0; i < count; i++)
+			array[i] = fdt32_to_cpu(cell[i]);
+	}
+	return err;
+}
+
+/**
+ * Look up a boolean property in a node and return it.
+ *
+ * A boolean properly is true if present in the device tree and false if not
+ * present, or present with a 0 value.
+ *
+ * @param blob	FDT blob
+ * @param node	node to examine
+ * @param prop_name	name of property to find
+ * @return 1 if the properly is present; 0 if it isn't present or is 0
+ */
+int fdtdec_get_bool(const void *blob, int node, const char *prop_name)
+{
+	const s32 *cell;
+	int len;
+
+	debug("%s: %s\n", __func__, prop_name);
+	cell = fdt_getprop(blob, node, prop_name, &len);
+	if (!cell)
+		return 0;
+	if (len >= sizeof(u32) && *cell == 0)
+		return 0;
+
+	return 1;
+}
-- 
1.7.3.1