linux-kernel - [RFC 01/10] property: add fwnode_match

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Date:   Mon, 21 Feb 2022 17:26:43 +0100
From:   Clément Léger <clement.leger@...tlin.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Wolfram Sang <wsa@...nel.org>, Peter Rosin <peda@...ntia.se>,
        Russell King <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-i2c@...r.kernel.org, netdev@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Clément Léger <clement.leger@...tlin.com>
Subject: [RFC 01/10] property: add fwnode_match_node()

Add a function equivalent to of_match_node() which is usable for fwnode
support. Matching is based on the compatible property and it returns
the best matches for the node according to the compatible list
ordering.

Signed-off-by: Clément Léger <clement.leger@...tlin.com>
---
 drivers/base/property.c  | 23 +++++++++++++++++++++++
 include/linux/property.h |  3 +++
 2 files changed, 26 insertions(+)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index e6497f6877ee..434c2713fd99 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -1158,6 +1158,29 @@ int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
 }
 EXPORT_SYMBOL(fwnode_graph_parse_endpoint);
 
+const struct of_device_id *fwnode_match_node(const struct fwnode_handle *fwnode,
+					     const struct of_device_id *matches)
+{
+	int index;
+	const struct of_device_id *best_match = NULL;
+	int best_index = INT_MAX;
+
+	if (!matches)
+		return NULL;
+
+	for (; matches->name[0] || matches->type[0] || matches->compatible[0]; matches++) {
+		index = fwnode_property_match_string(fwnode, "compatible",
+						     matches->compatible);
+		if (index >= 0 && index < best_index) {
+			best_match = matches;
+			best_index = index;
+		}
+	}
+
+	return best_match;
+}
+EXPORT_SYMBOL(fwnode_match_node);
+
 const void *device_get_match_data(struct device *dev)
 {
 	return fwnode_call_ptr_op(dev_fwnode(dev), device_get_match_data, dev);
diff --git a/include/linux/property.h b/include/linux/property.h
index 7399a0b45f98..978ecf6be34e 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -446,6 +446,9 @@ static inline void *device_connection_find_match(struct device *dev,
 	return fwnode_connection_find_match(dev_fwnode(dev), con_id, data, match);
 }
 
+const struct of_device_id *fwnode_match_node(const struct fwnode_handle *fwnode,
+					     const struct of_device_id *matches);
+
 /* -------------------------------------------------------------------------- */
 /* Software fwnode support - when HW description is incomplete or missing */
 
-- 
2.34.1