From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
To: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
Hans de Goede <hdegoede@redhat.com>
Cc: 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 v4 08/16] device property: Introduce fwnode_find_reference()
Date: Wed, 22 May 2019 13:51:05 +0300 [thread overview]
Message-ID: <20190522105113.11153-9-heikki.krogerus@linux.intel.com> (raw)
In-Reply-To: <20190522105113.11153-1-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>
---
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
next prev parent reply other threads:[~2019-05-22 10:51 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-22 10:50 [PATCH v4 00/16] Software fwnode references Heikki Krogerus
2019-05-22 10:50 ` [PATCH v4 01/16] software node: Allow node creation without properties Heikki Krogerus
2019-05-22 10:50 ` [PATCH v4 02/16] software node: Simplify software_node_release() function Heikki Krogerus
2019-05-22 10:51 ` [PATCH v4 03/16] software node: Add support for static node descriptors Heikki Krogerus
2019-05-22 10:51 ` [PATCH v4 04/16] software node: Use kobject name when finding child nodes by name Heikki Krogerus
2019-05-22 10:51 ` [PATCH v4 05/16] software node: Add software_node_get_reference_args() Heikki Krogerus
2019-05-22 10:51 ` [PATCH v4 06/16] driver core: Add helper device_find_child_by_name() Heikki Krogerus
2019-05-22 10:51 ` [PATCH v4 07/16] ACPI / property: Don't limit named child node matching to data nodes Heikki Krogerus
2019-05-22 10:51 ` Heikki Krogerus [this message]
2019-05-22 10:51 ` [PATCH v4 09/16] device connection: Find connections also by checking the references Heikki Krogerus
2019-05-22 10:51 ` [PATCH v4 10/16] usb: typec: Registering real device entries for the muxes Heikki Krogerus
2019-05-22 10:51 ` [PATCH v4 11/16] platform/x86: intel_cht_int33fe: Register max17047 in its own function Heikki Krogerus
2019-05-22 10:51 ` [PATCH v4 12/16] platform/x86: intel_cht_int33fe: Remove unused fusb302 device property Heikki Krogerus
2019-05-22 10:51 ` [PATCH v4 13/16] platform/x86: intel_cht_int33fe: Provide software nodes for the devices Heikki Krogerus
2019-05-29 9:30 ` Hans de Goede
2019-05-31 9:10 ` Rafael J. Wysocki
2019-05-31 13:46 ` Heikki Krogerus
2019-05-22 10:51 ` [PATCH v4 14/16] platform/x86: intel_cht_int33fe: Provide fwnode for the USB connector Heikki Krogerus
2019-05-22 10:51 ` [PATCH v4 15/16] platform/x86: intel_cht_int33fe: Supply fwnodes for the external dependencies Heikki Krogerus
2019-05-29 9:36 ` Hans de Goede
2019-05-22 10:51 ` [PATCH v4 16/16] platform/x86: intel_cht_int33fe: Replacing the old connections with references Heikki Krogerus
2019-05-24 18:44 ` [PATCH v4 00/16] Software fwnode references Andy Shevchenko
2019-05-29 9:29 ` Hans de Goede
2019-05-31 13:42 ` Heikki Krogerus
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