From: "Luis R. Rodriguez" <mcgrof@xxxxxxxxxxxxxxxx>
This was added via 9c19761a. While at it clean up the backported
header a bit to make backporting more OF stuff more manageable.
mcgrof@frijol ~/linux-stable (git::master)$ git describe --contains 9c19761a
v3.7-rc1~123^2~4
commit 9c19761a7ecdc86abb2fba0feb81e8952eccc1f1
Author: Srinivas Kandagatla <srinivas.kandagatla@xxxxxx>
Date: Tue Sep 18 08:10:28 2012 +0100
dt: introduce of_get_child_by_name to get child node by name
This patch introduces of_get_child_by_name function to get a child node
by its name in a given parent node.
Without this patch each driver code has to iterate the parent and do
a string compare, However having of_get_child_by_name libary function would
avoid code duplication, errors and is more convenient.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxx>
Signed-off-by: Rob Herring <rob.herring@xxxxxxxxxxx>
Signed-off-by: Luis R. Rodriguez <mcgrof@xxxxxxxxxxxxxxxx>
---
backport/backport-include/linux/of.h | 23 ++++++++++++++++++++---
backport/compat/compat-3.7.c | 29 +++++++++++++++++++++++++++++
2 files changed, 49 insertions(+), 3 deletions(-)
diff --git a/backport/backport-include/linux/of.h b/backport/backport-include/linux/of.h
index c5dc87c..93e91dd 100644
--- a/backport/backport-include/linux/of.h
+++ b/backport/backport-include/linux/of.h
@@ -4,13 +4,30 @@
#include <linux/version.h>
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,34))
-#include_next <linux/of.h>
-#else
+#define KERNEL_HAS_OF_SUPPORT 1
+#endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,34)) */
#ifdef CONFIG_OF
+#define KERNEL_HAS_OF_SUPPORT 1
+#endif /* CONFIG_OF */
+
+#ifdef KERNEL_HAS_OF_SUPPORT
#include_next <linux/of.h>
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0))
+#ifdef CONFIG_OF
+extern struct device_node *of_get_child_by_name(const struct device_node *node,
+ const char *name);
+#else
+static inline struct device_node *of_get_child_by_name(
+ const struct device_node *node,
+ const char *name)
+{
+ return NULL;
+}
#endif /* CONFIG_OF */
+#endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0)) */
-#endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,34)) */
+#endif /* KERNEL_HAS_OF_SUPPORT */
#endif /* _COMPAT_LINUX_OF_H */
diff --git a/backport/compat/compat-3.7.c b/backport/compat/compat-3.7.c
index 0f2d332..8f5a56c 100644
--- a/backport/compat/compat-3.7.c
+++ b/backport/compat/compat-3.7.c
@@ -251,3 +251,32 @@ int pcie_capability_clear_and_set_dword(struct pci_dev *dev, int pos,
return ret;
}
EXPORT_SYMBOL_GPL(pcie_capability_clear_and_set_dword);
+
+#ifdef KERNEL_HAS_OF_SUPPORT
+#ifdef CONFIG_OF
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0))
+/**
+ * of_get_child_by_name - Find the child node by name for a given parent
+ * @node: parent node
+ * @name: child name to look for.
+ *
+ * This function looks for child node for given matching name
+ *
+ * Returns a node pointer if found, with refcount incremented, use
+ * of_node_put() on it when done.
+ * Returns NULL if node is not found.
+ */
+struct device_node *of_get_child_by_name(const struct device_node *node,
+ const char *name)
+{
+ struct device_node *child;
+
+ for_each_child_of_node(node, child)
+ if (child->name && (of_node_cmp(child->name, name) == 0))
+ break;
+ return child;
+}
+EXPORT_SYMBOL_GPL(of_get_child_by_name);
+#endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0)) */
+#endif /* CONFIG_OF */
+#endif /* KERNEL_HAS_OF_SUPPORT */
--
1.7.10.4
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