linux-kernel - [PATCH] ARM: dts: integrator: Fix DMA ranges mismatch warning on IM-PD1

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Message-ID: <20251204164228.113587-1-visitorckw@gmail.com>
Date: Thu,  4 Dec 2025 16:42:28 +0000
From: Kuan-Wei Chiu <visitorckw@...il.com>
To: linus.walleij@...aro.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	arnd@...db.de
Cc: jserv@...s.ncku.edu.tw,
	linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Kuan-Wei Chiu <visitorckw@...il.com>,
	stable@...r.kernel.org
Subject: [PATCH] ARM: dts: integrator: Fix DMA ranges mismatch warning on IM-PD1

When compiling the device tree for the Integrator/AP with IM-PD1, the
following warning is observed regarding the display controller node:

arch/arm/boot/dts/arm/integratorap-im-pd1.dts:251.3-14: Warning
(dma_ranges_format):
/bus@...00000/bus@...00000/display@...0000:dma-ranges: empty
"dma-ranges" property but its #address-cells (2) differs from
/bus@...00000/bus@...00000 (1)

The display node specifies an empty "dma-ranges" property, intended to
describe a 1:1 identity mapping. However, the node lacks explicit
"#address-cells" and "#size-cells" properties. In this case, the device
tree compiler defaults the address cells to 2 (64-bit), which conflicts
with the parent bus configuration (32-bit, 1 cell).

Fix this by explicitly defining "#address-cells" and "#size-cells" as
1. This matches the 32-bit architecture of the Integrator platform and
ensures the address translation range is correctly parsed by the
compiler.

Fixes: 7bea67a99430 ("ARM: dts: integrator: Fix DMA ranges")
Cc: stable@...r.kernel.org
Signed-off-by: Kuan-Wei Chiu <visitorckw@...il.com>
---
 arch/arm/boot/dts/arm/integratorap-im-pd1.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/boot/dts/arm/integratorap-im-pd1.dts b/arch/arm/boot/dts/arm/integratorap-im-pd1.dts
index db13e09f2fab..6d90d9a42dc9 100644
--- a/arch/arm/boot/dts/arm/integratorap-im-pd1.dts
+++ b/arch/arm/boot/dts/arm/integratorap-im-pd1.dts
@@ -248,6 +248,8 @@ display@...0000 {
 		/* 640x480 16bpp @ 25.175MHz is 36827428 bytes/s */
 		max-memory-bandwidth = <40000000>;
 		memory-region = <&impd1_ram>;
+		#address-cells = <1>;
+		#size-cells = <1>;
 		dma-ranges;

 		port@0 {
-- 
2.52.0.177.g9f829587af-goog