linux-kernel - [PATCH] soc: aspeed: Use of_reserved_mem_region_to

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Message-ID: <20250703183508.2074735-1-robh@kernel.org>
Date: Thu,  3 Jul 2025 13:35:07 -0500
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Joel Stanley <joel@....id.au>,
	Andrew Jeffery <andrew@...econstruct.com.au>
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-aspeed@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] soc: aspeed: 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.

The error handling is a bit different. "memory-region" is optional, so
failed lookup is not an error. But then an error in
of_address_to_resource() is treated as an error. However, that
distinction is not really important. Either the region is available
and usable or it is not. So now, it is just
of_reserved_mem_region_to_resource() which is checked for an error.

Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
---
 drivers/soc/aspeed/aspeed-lpc-ctrl.c | 14 +++-----------
 drivers/soc/aspeed/aspeed-p2a-ctrl.c | 14 +++-----------
 2 files changed, 6 insertions(+), 22 deletions(-)

diff --git a/drivers/soc/aspeed/aspeed-lpc-ctrl.c b/drivers/soc/aspeed/aspeed-lpc-ctrl.c
index ee58151bd69e..b7dbb12bd095 100644
--- a/drivers/soc/aspeed/aspeed-lpc-ctrl.c
+++ b/drivers/soc/aspeed/aspeed-lpc-ctrl.c
@@ -10,6 +10,7 @@
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/of_address.h>
+#include <linux/of_reserved_mem.h>
 #include <linux/platform_device.h>
 #include <linux/poll.h>
 #include <linux/regmap.h>
@@ -254,17 +255,8 @@ static int aspeed_lpc_ctrl_probe(struct platform_device *pdev)
 	dev_set_drvdata(&pdev->dev, lpc_ctrl);
 
 	/* If memory-region is described in device tree then store */
-	node = of_parse_phandle(dev->of_node, "memory-region", 0);
-	if (!node) {
-		dev_dbg(dev, "Didn't find reserved memory\n");
-	} else {
-		rc = of_address_to_resource(node, 0, &resm);
-		of_node_put(node);
-		if (rc) {
-			dev_err(dev, "Couldn't address to resource for reserved memory\n");
-			return -ENXIO;
-		}
-
+	rc = of_reserved_mem_region_to_resource(dev->of_node, 0, &resm);
+	if (!rc) {
 		lpc_ctrl->mem_size = resource_size(&resm);
 		lpc_ctrl->mem_base = resm.start;
 
diff --git a/drivers/soc/aspeed/aspeed-p2a-ctrl.c b/drivers/soc/aspeed/aspeed-p2a-ctrl.c
index 6cc943744e12..3be2e1b1085b 100644
--- a/drivers/soc/aspeed/aspeed-p2a-ctrl.c
+++ b/drivers/soc/aspeed/aspeed-p2a-ctrl.c
@@ -19,7 +19,7 @@
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/of.h>
-#include <linux/of_address.h>
+#include <linux/of_reserved_mem.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
@@ -334,7 +334,6 @@ static int aspeed_p2a_ctrl_probe(struct platform_device *pdev)
 	struct aspeed_p2a_ctrl *misc_ctrl;
 	struct device *dev;
 	struct resource resm;
-	struct device_node *node;
 	int rc = 0;
 
 	dev = &pdev->dev;
@@ -346,15 +345,8 @@ static int aspeed_p2a_ctrl_probe(struct platform_device *pdev)
 	mutex_init(&misc_ctrl->tracking);
 
 	/* optional. */
-	node = of_parse_phandle(dev->of_node, "memory-region", 0);
-	if (node) {
-		rc = of_address_to_resource(node, 0, &resm);
-		of_node_put(node);
-		if (rc) {
-			dev_err(dev, "Couldn't address to resource for reserved memory\n");
-			return -ENODEV;
-		}
-
+	rc = of_reserved_mem_region_to_resource(dev->of_node, 0, &resm);
+	if (!rc) {
 		misc_ctrl->mem_size = resource_size(&resm);
 		misc_ctrl->mem_base = resm.start;
 	}
-- 
2.47.2