From: Duje Mihanović <duje@dujemihanovic.xyz>
Date: Thu, 9 Apr 2026 21:17:25 +0000 (+0200)
Subject: arm64: dts: marvell: samsung,coreprimevelte: Use memory-region for framebuffer
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cfb4346423eb5dab498546d617a8c444b878bff3;p=thirdparty%2Fkernel%2Flinux.git

arm64: dts: marvell: samsung,coreprimevelte: Use memory-region for framebuffer

Since the framebuffer resides in system RAM, use the memory-region
property preferred in that case over reg.

Also, testing showed that reusing most of the region (excluding where
the actual framebuffer resides) is perfectly safe, so do that and save
~22.5 MiB of RAM in the process.

Signed-off-by: Duje Mihanović <duje@dujemihanovic.xyz>
---

diff --git a/arch/arm64/boot/dts/marvell/mmp/pxa1908-samsung-coreprimevelte.dts b/arch/arm64/boot/dts/marvell/mmp/pxa1908-samsung-coreprimevelte.dts
index bb0a993996241..f71bb856f1e7a 100644
--- a/arch/arm64/boot/dts/marvell/mmp/pxa1908-samsung-coreprimevelte.dts
+++ b/arch/arm64/boot/dts/marvell/mmp/pxa1908-samsung-coreprimevelte.dts
@@ -23,7 +23,7 @@
 
 		fb0: framebuffer@17177000 {
 			compatible = "simple-framebuffer";
-			reg = <0 0x17177000 0 (480 * 800 * 4)>;
+			memory-region = <&fb_mem>;
 			power-domains = <&apmu PXA1908_POWER_DOMAIN_DSI>;
 			width = <480>;
 			height = <800>;
@@ -48,8 +48,9 @@
 			reg = <0 0 0 0x1000000>;
 		};
 
-		framebuffer@17000000 {
-			reg = <0 0x17000000 0 0x1800000>;
+		/* The "active buffer" is at 0x17000000 + (size of one buffer). */
+		fb_mem: framebuffer@17177000 {
+			reg = <0 0x17177000 0 (480 * 800 * 4)>;
 			no-map;
 		};
 	};