linux-kernel - [PATCH 1/4] device property: Introduce fwnode

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Message-Id: <20181105091727.25544-2-heikki.krogerus@linux.intel.com>
Date:   Mon,  5 Nov 2018 12:17:24 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: [PATCH 1/4] device property: Introduce fwnode_name()

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@...ux.intel.com>
---
 drivers/base/property.c  | 18 ++++++++++++++++++
 include/linux/fwnode.h   |  1 +
 include/linux/property.h |  2 ++
 3 files changed, 21 insertions(+)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 240ab5230ff6..1e4eb7ab2b84 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -1156,6 +1156,24 @@ void fwnode_handle_put(struct fwnode_handle *fwnode)
 }
 EXPORT_SYMBOL_GPL(fwnode_handle_put);
 
+/**
+ * fwnode_name - Get the name of a device node
+ * @fwnode: Pointer to the device node.
+ *
+ * Returns the node name of @fwnode. If @fwnode does not have a "unit name",
+ * this code will also attempt to read a string property named "name".
+ */
+const char *fwnode_name(const struct fwnode_handle *fwnode)
+{
+	const char *name = fwnode_call_ptr_op(fwnode, name);
+
+	if (!name)
+		fwnode_call_int_op(fwnode, property_read_string_array,
+				   "name", &name, 1);
+	return name;
+}
+EXPORT_SYMBOL_GPL(fwnode_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..2e445fed4df4 100644
--- a/include/linux/fwnode.h
+++ b/include/linux/fwnode.h
@@ -72,6 +72,7 @@ struct fwnode_reference_args {
 struct fwnode_operations {
 	struct fwnode_handle *(*get)(struct fwnode_handle *fwnode);
 	void (*put)(struct fwnode_handle *fwnode);
+	const char *(*name)(const struct fwnode_handle *fwnode);
 	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..44781d37dd96 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);
 
+const char *fwnode_name(const struct fwnode_handle *fwnode);
+
 int fwnode_irq_get(struct fwnode_handle *fwnode, unsigned int index);
 
 unsigned int device_get_child_node_count(struct device *dev);
-- 
2.19.1