linux-kernel - [PATCH] drm/simpledrm: Use of_reserved_mem_region_to

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Message-ID: <20250703183447.2073902-1-robh@kernel.org>
Date: Thu,  3 Jul 2025 13:34:47 -0500
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Thomas Zimmermann <tzimmermann@...e.de>,
	Javier Martinez Canillas <javierm@...hat.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] drm/simpledrm: 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@...nel.org>
---
 drivers/gpu/drm/sysfb/simpledrm.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/sysfb/simpledrm.c b/drivers/gpu/drm/sysfb/simpledrm.c
index a1c3119330de..c8856e6645e2 100644
--- a/drivers/gpu/drm/sysfb/simpledrm.c
+++ b/drivers/gpu/drm/sysfb/simpledrm.c
@@ -4,7 +4,7 @@
 #include <linux/clk.h>
 #include <linux/of_clk.h>
 #include <linux/minmax.h>
-#include <linux/of_address.h>
+#include <linux/of_reserved_mem.h>
 #include <linux/platform_data/simplefb.h>
 #include <linux/platform_device.h>
 #include <linux/pm_domain.h>
@@ -180,22 +180,17 @@ simplefb_get_format_of(struct drm_device *dev, struct device_node *of_node)
 static struct resource *
 simplefb_get_memory_of(struct drm_device *dev, struct device_node *of_node)
 {
-	struct device_node *np;
-	struct resource *res;
+	struct resource r, *res;
 	int err;
 
-	np = of_parse_phandle(of_node, "memory-region", 0);
-	if (!np)
+	err = of_reserved_mem_region_to_resource(of_node, 0, &r);
+	if (err)
 		return NULL;
 
-	res = devm_kzalloc(dev->dev, sizeof(*res), GFP_KERNEL);
+	res = devm_kmemdup(dev->dev, &r, sizeof(r), GFP_KERNEL);
 	if (!res)
 		return ERR_PTR(-ENOMEM);
 
-	err = of_address_to_resource(np, 0, res);
-	if (err)
-		return ERR_PTR(err);
-
 	if (of_property_present(of_node, "reg"))
 		drm_warn(dev, "preferring \"memory-region\" over \"reg\" property\n");
 
-- 
2.47.2