fdt: Add fdtdec functions to read byte array

Sometimes we don't need a full cell for each value. This provides
a simple function to read a byte array, both with and without
copying it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>

diff --git a/include/fdtdec.h b/include/fdtdec.h
index 49251d59c3da12b561f384bfb79cf2baf03b2d94..b6db0278bdc2ba33acf841660b1d5151c26de5c0 100644 (file)
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -349,3 +349,35 @@ int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
  * @return 0 if all ok or gpio was FDT_GPIO_NONE; -1 on error
  */
 int fdtdec_setup_gpio(struct fdt_gpio_state *gpio);
+
+/*
+ * Look up a property in a node and return its contents in a byte
+ * array of given length. The property must have at least enough data for
+ * the array (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_MISSING if the property is not found,
+ *             or -FDT_ERR_BADLAYOUT if not enough data
+ */
+int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
+               u8 *array, int count);
+
+/**
+ * Look up a property in a node and return a pointer to its contents as a
+ * byte array of given length. The property must have at least enough data
+ * for the array (count bytes). It may have more, but this will be ignored.
+ * The data is not copied.
+ *
+ * @param blob         FDT blob
+ * @param node         node to examine
+ * @param prop_name    name of property to find
+ * @param count                number of array elements
+ * @return pointer to byte array if found, or NULL if the property is not
+ *             found or there is not enough data
+ */
+const u8 *fdtdec_locate_byte_array(const void *blob, int node,
+                            const char *prop_name, int count);

diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 42c3e893d6ad8f692fce7eedd6e0bc2233f2ae6f..ba5c591489ae18494744af3a102c4c571e12d154 100644 (file)
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -476,3 +476,27 @@ int fdtdec_setup_gpio(struct fdt_gpio_state *gpio)
                return -1;
        return 0;
 }
+
+int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
+               u8 *array, int count)
+{
+       const u8 *cell;
+       int err;
+
+       cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
+       if (!err)
+               memcpy(array, cell, count);
+       return err;
+}
+
+const u8 *fdtdec_locate_byte_array(const void *blob, int node,
+                            const char *prop_name, int count)
+{
+       const u8 *cell;
+       int err;
+
+       cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
+       if (err)
+               return NULL;
+       return cell;
+}