linux-kernel - [PATCH v3 03/14] software node: Implement device_get_match

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Message-Id: <20260110-pci-m2-e-v3-3-4faee7d0d5ae@oss.qualcomm.com>
Date: Sat, 10 Jan 2026 12:26:21 +0530
From: Manivannan Sadhasivam via B4 Relay <devnull+manivannan.sadhasivam.oss.qualcomm.com@...nel.org>
To: Rob Herring <robh@...nel.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Jiri Slaby <jirislaby@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
 Nicolas Schier <nicolas.schier@...ux.dev>, Hans de Goede <hansg@...nel.org>, 
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
 Mark Pearson <mpearson-lenovo@...ebb.ca>, 
 "Derek J. Clark" <derekjohn.clark@...il.com>, 
 Manivannan Sadhasivam <mani@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Marcel Holtmann <marcel@...tmann.org>, 
 Luiz Augusto von Dentz <luiz.dentz@...il.com>, 
 Bartosz Golaszewski <brgl@...ev.pl>, 
 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>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, Danilo Krummrich <dakr@...nel.org>, 
 Bartosz Golaszewski <brgl@...nel.org>
Cc: linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-kbuild@...r.kernel.org, platform-driver-x86@...r.kernel.org, 
 linux-pci@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, linux-bluetooth@...r.kernel.org, 
 linux-pm@...r.kernel.org, Stephan Gerhold <stephan.gerhold@...aro.org>, 
 Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>, 
 linux-acpi@...r.kernel.org, 
 Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>, 
 Sui Jingfeng <sui.jingfeng@...ux.dev>
Subject: [PATCH v3 03/14] software node: Implement device_get_match_data
 fwnode callback

From: Sui Jingfeng <sui.jingfeng@...ux.dev>

Because the software node backend of the fwnode API framework lacks an
implementation for the .device_get_match_data function callback. This
makes it difficult to use(and/or test) a few drivers that originates
from DT world on the non-DT platform.

Implement the .device_get_match_data fwnode callback, which helps to keep
the three backends of the fwnode API aligned as much as possible. This is
also a fundamental step to make a few drivers OF-independent truely
possible.

Device drivers or platform setup codes are expected to provide a software
node string property, named as "compatible". At this moment, the value of
this string property is being used to match against the compatible entries
in the of_device_id table. It can be extended in the future though.

Signed-off-by: Sui Jingfeng <sui.jingfeng@...ux.dev>
[mani: removed fixes tag]
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
---
 drivers/base/swnode.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
index 16a8301c25d6..cd722712b8e9 100644
--- a/drivers/base/swnode.c
+++ b/drivers/base/swnode.c
@@ -15,6 +15,7 @@
 #include <linux/kobject.h>
 #include <linux/kstrtox.h>
 #include <linux/list.h>
+#include <linux/mod_devicetable.h>
 #include <linux/property.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
@@ -390,6 +391,33 @@ static void software_node_put(struct fwnode_handle *fwnode)
 	kobject_put(&swnode->kobj);
 }

+static const void *
+software_node_get_match_data(const struct fwnode_handle *fwnode,
+			     const struct device *dev)
+{
+	struct swnode *swnode = to_swnode(fwnode);
+	const struct of_device_id *matches = dev->driver->of_match_table;
+	const char *val = NULL;
+	int ret;
+
+	ret = property_entry_read_string_array(swnode->node->properties,
+					       "compatible", &val, 1);
+	if (ret < 0 || !val)
+		return NULL;
+
+	if (!matches)
+		return NULL;
+
+	while (matches->compatible[0]) {
+		if (!strcmp(matches->compatible, val))
+			return matches->data;
+
+		++matches;
+	}
+
+	return NULL;
+}
+
 static bool software_node_property_present(const struct fwnode_handle *fwnode,
 					   const char *propname)
 {
@@ -694,6 +722,7 @@ software_node_graph_parse_endpoint(const struct fwnode_handle *fwnode,
 static const struct fwnode_operations software_node_ops = {
 	.get = software_node_get,
 	.put = software_node_put,
+	.device_get_match_data = software_node_get_match_data,
 	.property_present = software_node_property_present,
 	.property_read_bool = software_node_property_present,
 	.property_read_int_array = software_node_read_int_array,

-- 
2.48.1