From: Rob Herring (Arm) <robh@kernel.org>
Date: Thu, 3 Jul 2025 18:35:33 +0000 (-0500)
Subject: hwtracing: coresight: Use of_reserved_mem_region_to_resource() for "memory-region"
X-Git-Tag: v6.18-rc1~74^2~5^2~23
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9ba5502136eea6f3c95ab3c84220916fac89d844;p=thirdparty%2Fkernel%2Flinux.git

hwtracing: coresight: Use of_reserved_mem_region_to_resource() for "memory-region"

Use the newly added of_reserved_mem_region_to_resource() function to
handle "memory-region" properties.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20250703183534.2075569-1-robh@kernel.org
---

diff --git a/drivers/hwtracing/coresight/coresight-tmc-core.c b/drivers/hwtracing/coresight/coresight-tmc-core.c
index 88afb16bb6bec..be964656be933 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-core.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-core.c
@@ -24,6 +24,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/of_reserved_mem.h>
 #include <linux/coresight.h>
 #include <linux/amba/bus.h>
 #include <linux/platform_device.h>
@@ -634,25 +635,14 @@ static int of_tmc_get_reserved_resource_by_name(struct device *dev,
 						const char *name,
 						struct resource *res)
 {
-	int index, rc = -ENODEV;
-	struct device_node *node;
+	int rc = -ENODEV;
 
-	if (!is_of_node(dev->fwnode))
-		return -ENODEV;
-
-	index = of_property_match_string(dev->of_node, "memory-region-names",
-					 name);
-	if (index < 0)
-		return rc;
-
-	node = of_parse_phandle(dev->of_node, "memory-region", index);
-	if (!node)
+	rc = of_reserved_mem_region_to_resource_byname(dev->of_node, name, res);
+	if (rc < 0)
 		return rc;
 
-	if (!of_address_to_resource(node, 0, res) &&
-	    res->start != 0 && resource_size(res) != 0)
-		rc = 0;
-	of_node_put(node);
+	if (res->start == 0 || resource_size(res) == 0)
+		rc = -ENODEV;
 
 	return rc;
 }