From: Abhilash Kesavan <a.kesavan@samsung.com>
Date: Thu, 25 Oct 2012 16:30:58 +0000 (+0000)
Subject: fdt: Add function to get config int from device tree
X-Git-Tag: v2013.01-rc2~118^2^2~13
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=09258f1e8b12acc4a2a02b60d942660798038fba;p=u-boot

fdt: Add function to get config int from device tree

Add a function to look up a configuration item such as machine id
and return its value.

Note: The code has been taken as is from the Chromium u-boot development
tree and needs Simon Glass' sign-off.

Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
---

diff --git a/include/fdtdec.h b/include/fdtdec.h
index 0b140752ff..d880fe8d9e 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -354,6 +354,19 @@ int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
  */
 int fdtdec_setup_gpio(struct fdt_gpio_state *gpio);
 
+/**
+ * Look in the FDT for a config item with the given name and return its value
+ * as a 32-bit integer. The property must have at least 4 bytes of data. The
+ * value of the first cell is returned.
+ *
+ * @param blob		FDT blob to use
+ * @param prop_name	Node property name
+ * @param default_val	default value to return if the property is not found
+ * @return integer value, if found, or default_val if not
+ */
+int fdtdec_get_config_int(const void *blob, const char *prop_name,
+		int default_val);
+
 /*
  * 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
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 4c23f458f0..1f500224d9 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -512,3 +512,25 @@ const u8 *fdtdec_locate_byte_array(const void *blob, int node,
 		return NULL;
 	return cell;
 }
+
+/**
+ * Look in the FDT for a config item with the given name and return its value
+ * as a 32-bit integer. The property must have at least 4 bytes of data. The
+ * value of the first cell is returned.
+ *
+ * @param blob		FDT blob to use
+ * @param prop_name	Node property name
+ * @param default_val	default value to return if the property is not found
+ * @return integer value, if found, or default_val if not
+ */
+int fdtdec_get_config_int(const void *blob, const char *prop_name,
+		int default_val)
+{
+	int config_node;
+
+	debug("%s: %s\n", __func__, prop_name);
+	config_node = fdt_path_offset(blob, "/config");
+	if (config_node < 0)
+		return default_val;
+	return fdtdec_get_int(blob, config_node, prop_name, default_val);
+}