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-rw-r--r--drivers/of/base.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 80c9dec..9bd7c4a 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -117,6 +117,32 @@ int of_device_is_compatible(const struct device_node *device,
EXPORT_SYMBOL(of_device_is_compatible);
/**
+ * of_device_is_available - check if a device is available for use
+ *
+ * @device: Node to check for availability
+ *
+ * Returns 1 if the status property is absent or set to "okay" or "ok",
+ * 0 otherwise
+ */
+int of_device_is_available(const struct device_node *device)
+{
+ const char *status;
+ int statlen;
+
+ status = of_get_property(device, "status", &statlen);
+ if (status == NULL)
+ return 1;
+
+ if (statlen > 0) {
+ if (!strcmp(status, "okay") || !strcmp(status, "ok"))
+ return 1;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(of_device_is_available);
+
+/**
* of_get_parent - Get a node's parent if any
* @node: Node to get parent
*