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[34.81.118.25]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7ff7e48f300sm19814805b3a.54.2025.12.25.09.31.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 Dec 2025 09:31:30 -0800 (PST) From: Kuan-Wei Chiu To: linusw@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, arnd@arndb.de Cc: linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, jserv@ccns.ncku.edu.tw, eleanor15x@gmail.com, Kuan-Wei Chiu , stable@vger.kernel.org Subject: [PATCH v2] ARM: dts: integrator: Fix DMA ranges mismatch warning on IM-PD1 Date: Thu, 25 Dec 2025 17:31:18 +0000 Message-ID: <20251225173118.580110-1-visitorckw@gmail.com> X-Mailer: git-send-email 2.52.0.358.g0dd7633a29-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 "dma-ranges" property is intended to describe DMA address translations for child nodes. However, the only child of the display controller is a "port" node, which does not perform DMA memory accesses. Since the property is not required for the child node and triggers a warning due to default address cell mismatch, remove it. Fixes: 7bea67a99430 ("ARM: dts: integrator: Fix DMA ranges") Cc: stable@vger.kernel.org Signed-off-by: Kuan-Wei Chiu --- Changes in v2: - Switch approach to remove the unused "dma-ranges" property instead of adding "#address-cells" and "#size-cells". arch/arm/boot/dts/arm/integratorap-im-pd1.dts | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/arm/boot/dts/arm/integratorap-im-pd1.dts b/arch/arm/boot/= dts/arm/integratorap-im-pd1.dts index db13e09f2fab..0e568baf03b0 100644 --- a/arch/arm/boot/dts/arm/integratorap-im-pd1.dts +++ b/arch/arm/boot/dts/arm/integratorap-im-pd1.dts @@ -248,7 +248,6 @@ display@1000000 { /* 640x480 16bpp @ 25.175MHz is 36827428 bytes/s */ max-memory-bandwidth =3D <40000000>; memory-region =3D <&impd1_ram>; - dma-ranges; =20 port@0 { #address-cells =3D <1>; --=20 2.52.0.358.g0dd7633a29-goog