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Received: from PA4PR04MB9366.eurprd04.prod.outlook.com (2603:10a6:102:2a9::8) by VI0PR04MB11022.eurprd04.prod.outlook.com (2603:10a6:800:25e::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9700.12; Wed, 11 Mar 2026 19:41:33 +0000 Received: from PA4PR04MB9366.eurprd04.prod.outlook.com ([fe80::75e4:8143:ddbc:6588]) by PA4PR04MB9366.eurprd04.prod.outlook.com ([fe80::75e4:8143:ddbc:6588%6]) with mapi id 15.20.9678.017; Wed, 11 Mar 2026 19:41:33 +0000 From: Frank Li To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Frank Li , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , devicetree@vger.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS), imx@lists.linux.dev (open list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE), linux-arm-kernel@lists.infradead.org (moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE), linux-kernel@vger.kernel.org (open list) Cc: imx@lists.linux.dev, Liu Ying Subject: [PATCH v2 1/1] ARM: dts: imx6sx: remove fallback compatible string fsl,imx28-lcdif Date: Wed, 11 Mar 2026 15:41:11 -0400 Message-ID: <20260311194111.2918037-1-Frank.Li@nxp.com> X-Mailer: git-send-email 2.43.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SN7PR04CA0188.namprd04.prod.outlook.com (2603:10b6:806:126::13) To PA4PR04MB9366.eurprd04.prod.outlook.com (2603:10a6:102:2a9::8) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PA4PR04MB9366:EE_|VI0PR04MB11022:EE_ X-MS-Office365-Filtering-Correlation-Id: 18e8b93f-645c-4465-ea5a-08de7fa632f3 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|7416014|52116014|19092799006|366016|18002099003|56012099003|38350700014|921020; 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The i.MX6SX controller provides additional overlay registers (AS_CTRL) which are not present on i.MX28. Linux has supported the dedicated compatible string since commit 45d59d704080 ("drm: Add new driver for MXSFB controller"). Other known DT users such as U-Boot and Barebox already support "fsl,imx6sx-lcdif", so removing the fallback compatible string is low risk since this device is used for display output only. Fix the following CHECK_DTB warning: /arch/arm/boot/dts/nxp/imx/imx6sx-nitrogen6sx.dtb: lcdif@2220000 (fsl,imx6sx-lcdif): compatible: 'oneOf' conditional failed, one must be fixed: ['fsl,imx6sx-lcdif', 'fsl,imx28-lcdif'] is too long Signed-off-by: Frank Li --- Change in v2: - update commit message to descript ABI broken judgement. - Have not add fixes tags because it is not user visualiable issue. Cc: Liu Ying Cc: Fabio Estevam Previous Fabio Estevam work try to allow fallback at https://lore.kernel.org/imx/42eb2d42-47b0-46b6-92e9-c59473113c2d@nxp.com/ --- arch/arm/boot/dts/nxp/imx/imx6sx.dtsi | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm/boot/dts/nxp/imx/imx6sx.dtsi b/arch/arm/boot/dts/nxp/imx/imx6sx.dtsi index 1426f357d4744..aefae5a3a6beb 100644 --- a/arch/arm/boot/dts/nxp/imx/imx6sx.dtsi +++ b/arch/arm/boot/dts/nxp/imx/imx6sx.dtsi @@ -1304,7 +1304,7 @@ csi2: csi@221c000 { }; lcdif1: lcdif@2220000 { - compatible = "fsl,imx6sx-lcdif", "fsl,imx28-lcdif"; + compatible = "fsl,imx6sx-lcdif"; reg = <0x02220000 0x4000>; interrupts = ; clocks = <&clks IMX6SX_CLK_LCDIF1_PIX>, @@ -1325,7 +1325,7 @@ lcdif1_to_ldb: endpoint { }; lcdif2: lcdif@2224000 { - compatible = "fsl,imx6sx-lcdif", "fsl,imx28-lcdif"; + compatible = "fsl,imx6sx-lcdif"; reg = <0x02224000 0x4000>; interrupts = ; clocks = <&clks IMX6SX_CLK_LCDIF2_PIX>, -- 2.43.0