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From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
To: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Hans de Goede <hdegoede@redhat.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Andy Shevchenko <andy@infradead.org>,
	linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
	platform-driver-x86@vger.kernel.org
Subject: [PATCH v5 08/16] device property: Introduce fwnode_find_reference()
Date: Fri, 31 May 2019 17:15:39 +0300
Message-ID: <20190531141547.22728-9-heikki.krogerus@linux.intel.com> (raw)
In-Reply-To: <20190531141547.22728-1-heikki.krogerus@linux.intel.com>

In most cases the references that the drivers look for don't
have any arguments. This introduces a wrapper function for
fwnode_property_get_reference_args() that looks for
references by using only the name and index.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/base/property.c  | 24 ++++++++++++++++++++++++
 include/linux/property.h |  4 ++++
 2 files changed, 28 insertions(+)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 348b37e64944..81bd01ed4042 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -484,6 +484,30 @@ int fwnode_property_get_reference_args(const struct fwnode_handle *fwnode,
 }
 EXPORT_SYMBOL_GPL(fwnode_property_get_reference_args);
 
+/**
+ * fwnode_find_reference - Find named reference to a fwnode_handle
+ * @fwnode: Firmware node where to look for the reference
+ * @name: The name of the reference
+ * @index: Index of the reference
+ *
+ * @index can be used when the named reference holds a table of references.
+ *
+ * Returns pointer to the reference fwnode, or ERR_PTR. Caller is responsible to
+ * call fwnode_handle_put() on the returned fwnode pointer.
+ */
+struct fwnode_handle *fwnode_find_reference(const struct fwnode_handle *fwnode,
+					    const char *name,
+					    unsigned int index)
+{
+	struct fwnode_reference_args args;
+	int ret;
+
+	ret = fwnode_property_get_reference_args(fwnode, name, NULL, 0, index,
+						 &args);
+	return ret ? ERR_PTR(ret) : args.fwnode;
+}
+EXPORT_SYMBOL_GPL(fwnode_find_reference);
+
 /**
  * device_remove_properties - Remove properties from a device object.
  * @dev: Device whose properties to remove.
diff --git a/include/linux/property.h b/include/linux/property.h
index abcde2f236a0..088d4db7e949 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -79,6 +79,10 @@ int fwnode_property_get_reference_args(const struct fwnode_handle *fwnode,
 				       unsigned int nargs, unsigned int index,
 				       struct fwnode_reference_args *args);
 
+struct fwnode_handle *fwnode_find_reference(const struct fwnode_handle *fwnode,
+					    const char *name,
+					    unsigned int index);
+
 struct fwnode_handle *fwnode_get_parent(const struct fwnode_handle *fwnode);
 struct fwnode_handle *fwnode_get_next_parent(
 	struct fwnode_handle *fwnode);
-- 
2.20.1


  parent reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-31 14:15 [PATCH v5 00/16] Software fwnode references Heikki Krogerus
2019-05-31 14:15 ` [PATCH v5 01/16] software node: Allow node creation without properties Heikki Krogerus
2019-05-31 14:15 ` [PATCH v5 02/16] software node: Simplify software_node_release() function Heikki Krogerus
2019-05-31 14:15 ` [PATCH v5 03/16] software node: Add support for static node descriptors Heikki Krogerus
2019-05-31 14:15 ` [PATCH v5 04/16] software node: Use kobject name when finding child nodes by name Heikki Krogerus
2019-05-31 14:15 ` [PATCH v5 05/16] software node: Add software_node_get_reference_args() Heikki Krogerus
2019-05-31 14:15 ` [PATCH v5 06/16] driver core: Add helper device_find_child_by_name() Heikki Krogerus
2019-05-31 14:15 ` [PATCH v5 07/16] ACPI / property: Don't limit named child node matching to data nodes Heikki Krogerus
2019-05-31 14:15 ` Heikki Krogerus [this message]
2019-05-31 14:15 ` [PATCH v5 09/16] device connection: Find connections also by checking the references Heikki Krogerus
2019-05-31 14:15 ` [PATCH v5 10/16] usb: typec: Registering real device entries for the muxes Heikki Krogerus
2019-05-31 14:15 ` [PATCH v5 11/16] platform/x86: intel_cht_int33fe: Register max17047 in its own function Heikki Krogerus
2019-05-31 14:15 ` [PATCH v5 12/16] platform/x86: intel_cht_int33fe: Remove unused fusb302 device property Heikki Krogerus
2019-05-31 14:15 ` [PATCH v5 13/16] platform/x86: intel_cht_int33fe: Provide software nodes for the devices Heikki Krogerus
2019-05-31 14:15 ` [PATCH v5 14/16] platform/x86: intel_cht_int33fe: Provide fwnode for the USB connector Heikki Krogerus
2019-05-31 14:15 ` [PATCH v5 15/16] platform/x86: intel_cht_int33fe: Supply fwnodes for the external dependencies Heikki Krogerus
2019-05-31 14:15 ` [PATCH v5 16/16] platform/x86: intel_cht_int33fe: Replacing the old connections with references Heikki Krogerus
2019-06-13 20:28 ` [PATCH v5 00/16] Software fwnode references Rafael J. Wysocki

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