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authorSimon Glass <sjg@chromium.org>2012-02-27 10:52:35 +0000
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2012-03-29 08:12:47 +0200
commitd17da65560f15f74f8efe321044b9cdf45e24c9b (patch)
tree4ea24114308650c2f77d0e891fe4314a19ae5798
parentf88fe2ded4acd035826018f33c6a67033a8f5d07 (diff)
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fdt: Add functions to access phandles, arrays and bools
Add a function to look up 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, although there is no actual boolean type in U-Boot. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Gerald Van Baren <vanbaren@cideas.com> Acked-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
-rw-r--r--include/fdtdec.h39
-rw-r--r--lib/fdtdec.c67
2 files changed, 106 insertions, 0 deletions
diff --git a/include/fdtdec.h b/include/fdtdec.h
index 5469c16..a446700 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -188,3 +188,42 @@ int fdtdec_find_aliases_for_id(const void *blob, const char *name,
* @return compatible string for that id
*/
const char *fdtdec_get_compatible(enum fdt_compat_id id);
+
+/* 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,
+ u32 *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, regardless of its 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
+ */
+int fdtdec_get_bool(const void *blob, int node, const char *prop_name);
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index bf31717..13bb470 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -271,3 +271,70 @@ 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_check_min_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,
+ u32 *array, int count)
+{
+ const u32 *cell;
+ int i, err = 0;
+
+ debug("%s: %s\n", __func__, prop_name);
+ cell = get_prop_check_min_len(blob, node, prop_name,
+ sizeof(u32) * count, &err);
+ if (!err) {
+ for (i = 0; i < count; i++)
+ array[i] = fdt32_to_cpu(cell[i]);
+ }
+ return err;
+}
+
+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);
+ return cell != NULL;
+}