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[35.194.250.14]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29dae49c8absm25090275ad.16.2025.12.04.08.42.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 04 Dec 2025 08:42:41 -0800 (PST) From: Kuan-Wei Chiu To: linus.walleij@linaro.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, arnd@arndb.de Cc: jserv@ccns.ncku.edu.tw, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Kuan-Wei Chiu , stable@vger.kernel.org Subject: [PATCH] ARM: dts: integrator: Fix DMA ranges mismatch warning on IM-PD1 Date: Thu, 4 Dec 2025 16:42:28 +0000 Message-ID: <20251204164228.113587-1-visitorckw@gmail.com> X-Mailer: git-send-email 2.52.0.177.g9f829587af-goog Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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@c0000000/bus@c0000000/display@1000000:dma-ranges: empty "dma-ranges" property but its #address-cells (2) differs from /bus@c0000000/bus@c0000000 (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@vger.kernel.org Signed-off-by: Kuan-Wei Chiu --- 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@1000000 { /* 640x480 16bpp @ 25.175MHz is 36827428 bytes/s */ max-memory-bandwidth =3D <40000000>; memory-region =3D <&impd1_ram>; + #address-cells =3D <1>; + #size-cells =3D <1>; dma-ranges; =20 port@0 { --=20 2.52.0.177.g9f829587af-goog