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Subject[PATCH v2 1/4] device property: Introduce fwnode_get_name()
Date
This helper returns the name of the node. The name is
primarily expected to be returned from a new fwnode
operation meant for this purpose, but when no name is
returned, the helper will also attempt to read a device
property "name".

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
drivers/base/property.c | 25 +++++++++++++++++++++++++
include/linux/fwnode.h | 3 +++
include/linux/property.h | 2 ++
3 files changed, 30 insertions(+)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 240ab5230ff6..4db710e2ce34 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -1156,6 +1156,31 @@ void fwnode_handle_put(struct fwnode_handle *fwnode)
}
EXPORT_SYMBOL_GPL(fwnode_handle_put);

+/**
+ * fwnode_get_name - Read the name of a node
+ * @fwnode: Pointer to the node.
+ * @buf: Buffer where the name is copied to
+ *
+ * Reads the node name of @fwnode with get_name fwnode op. If get_name op fails,
+ * the routine attempts to also read a property "name".
+ */
+int fwnode_get_name(const struct fwnode_handle *fwnode, char *buf)
+{
+ const char *name;
+ int ret;
+
+ if (!fwnode_call_int_op(fwnode, get_name, buf))
+ return 0;
+
+ ret = fwnode_call_int_op(fwnode, property_read_string_array,
+ "name", &name, 1);
+ if (!ret)
+ sprintf(buf, "%s", name);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(fwnode_get_name);
+
/**
* fwnode_device_is_available - check if a device is available for use
* @fwnode: Pointer to the fwnode of the device.
diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
index faebf0ca0686..cc234f5d2b40 100644
--- a/include/linux/fwnode.h
+++ b/include/linux/fwnode.h
@@ -48,6 +48,8 @@ struct fwnode_reference_args {
u64 args[NR_FWNODE_REFERENCE_ARGS];
};

+#define FWNODE_NAME_MAX_SIZE 32
+
/**
* struct fwnode_operations - Operations for fwnode interface
* @get: Get a reference to an fwnode.
@@ -72,6 +74,7 @@ struct fwnode_reference_args {
struct fwnode_operations {
struct fwnode_handle *(*get)(struct fwnode_handle *fwnode);
void (*put)(struct fwnode_handle *fwnode);
+ int (*get_name)(const struct fwnode_handle *fwnode, char *buf);
bool (*device_is_available)(const struct fwnode_handle *fwnode);
const void *(*device_get_match_data)(const struct fwnode_handle *fwnode,
const struct device *dev);
diff --git a/include/linux/property.h b/include/linux/property.h
index ac8a1ebc4c1b..da37bdebf7ab 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -109,6 +109,8 @@ struct fwnode_handle *device_get_named_child_node(struct device *dev,
struct fwnode_handle *fwnode_handle_get(struct fwnode_handle *fwnode);
void fwnode_handle_put(struct fwnode_handle *fwnode);

+int fwnode_get_name(const struct fwnode_handle *fwnode, char *name);
+
int fwnode_irq_get(struct fwnode_handle *fwnode, unsigned int index);

unsigned int device_get_child_node_count(struct device *dev);
--
2.19.1
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