linux-kernel - [PATCH] fbdev: simplefb: Use of_reserved_mem_region_to

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Message-ID: <20250703183514.2074928-1-robh@kernel.org>
Date: Thu,  3 Jul 2025 13:35:13 -0500
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Hans de Goede <hdegoede@...hat.com>,
	Helge Deller <deller@....de>
Cc: linux-fbdev@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] fbdev: simplefb: 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/video/fbdev/simplefb.c | 17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)

diff --git a/drivers/video/fbdev/simplefb.c b/drivers/video/fbdev/simplefb.c
index be95fcddce4c..1893815dc67f 100644
--- a/drivers/video/fbdev/simplefb.c
+++ b/drivers/video/fbdev/simplefb.c
@@ -21,9 +21,9 @@
 #include <linux/platform_device.h>
 #include <linux/clk.h>
 #include <linux/of.h>
-#include <linux/of_address.h>
 #include <linux/of_clk.h>
 #include <linux/of_platform.h>
+#include <linux/of_reserved_mem.h>
 #include <linux/parser.h>
 #include <linux/pm_domain.h>
 #include <linux/regulator/consumer.h>
@@ -134,7 +134,7 @@ struct simplefb_params {
 static int simplefb_parse_dt(struct platform_device *pdev,
 			   struct simplefb_params *params)
 {
-	struct device_node *np = pdev->dev.of_node, *mem;
+	struct device_node *np = pdev->dev.of_node;
 	int ret;
 	const char *format;
 	int i;
@@ -174,19 +174,10 @@ static int simplefb_parse_dt(struct platform_device *pdev,
 		return -EINVAL;
 	}
 
-	mem = of_parse_phandle(np, "memory-region", 0);
-	if (mem) {
-		ret = of_address_to_resource(mem, 0, &params->memory);
-		if (ret < 0) {
-			dev_err(&pdev->dev, "failed to parse memory-region\n");
-			of_node_put(mem);
-			return ret;
-		}
-
+	ret = of_reserved_mem_region_to_resource(np, 0, &params->memory);
+	if (!ret) {
 		if (of_property_present(np, "reg"))
 			dev_warn(&pdev->dev, "preferring \"memory-region\" over \"reg\" property\n");
-
-		of_node_put(mem);
 	} else {
 		memset(&params->memory, 0, sizeof(params->memory));
 	}
-- 
2.47.2