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Fri, 10 Aug 2018 11:34:14 -0400 Received: from mail-eopbgr00138.outbound.protection.outlook.com ([40.107.0.138]:13072 "EHLO EUR02-AM5-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726120AbeHJPeO (ORCPT ); Fri, 10 Aug 2018 11:34:14 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=axentia.se; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=6ZCxZiPOq01DgtqeNoBYvdYLNpkWsLWQ+UV51mXhsgw=; b=pobS+05pInyk9L0WmQE/6lD7BApuFPhqZeNTz6r+ngRlt/OmxfLBVLCpwLA7uCaQxxd8bcs6JRX+4Q7QewxDgK5PKvAFNiApEZFYmrrmTVHS1k0GJM4V5gNuKz4yfhZUsDSnhrm3dOj38eP87CWuqCPDi3zNje8hW9Qy0Me2YXE= Authentication-Results: spf=none (sender IP is ) smtp.mailfrom=peda@axentia.se; Received: from orc.pedanet (85.226.244.23) by VI1PR0201MB2464.eurprd02.prod.outlook.com (2603:10a6:800:55::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.1038.21; Fri, 10 Aug 2018 13:04:19 +0000 From: Peter Rosin To: linux-kernel@vger.kernel.org Cc: Peter Rosin , Boris Brezillon , David Airlie , Rob Herring , Mark Rutland , Nicolas Ferre , Alexandre Belloni , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Jyri Sarha , Daniel Vetter , Andrzej Hajda , Russell King - ARM Linux , Jacopo Mondi , Sakari Ailus Subject: [PATCH v8 2/4] dt-bindings: display: atmel: optional video-interface of endpoints Date: Fri, 10 Aug 2018 15:03:57 +0200 Message-Id: <20180810130359.9882-3-peda@axentia.se> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180810130359.9882-1-peda@axentia.se> References: <20180810130359.9882-1-peda@axentia.se> MIME-Version: 1.0 X-Originating-IP: [85.226.244.23] X-ClientProxiedBy: VI1PR07CA0241.eurprd07.prod.outlook.com (2603:10a6:802:58::44) To VI1PR0201MB2464.eurprd02.prod.outlook.com (2603:10a6:800:55::7) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 6b7cc891-e4e8-408e-895b-08d5fec1c941 X-Microsoft-Antispam: BCL:0; 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This can happen e.g. if not all RGB pins are routed on the PCB; the driver has no way of knowing this, and needs to be told explicitly. This is critical for the devices that have the "conflicting output formats" issue (SAM9N12, SAM9X5, SAMA5D3), since the most significant RGB bits move around depending on the selected output mode. For devices that do not have the "conflicting output formats" issue (SAMA5D2, SAMA5D4), this is completely irrelevant. Acked-by: Boris Brezillon Reviewed-by: Rob Herring Reviewed-by: Jacopo Mondi Signed-off-by: Peter Rosin --- .../devicetree/bindings/display/atmel/hlcdc-dc.txt | 28 ++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/Documentation/devicetree/bindings/display/atmel/hlcdc-dc.txt b/Documentation/devicetree/bindings/display/atmel/hlcdc-dc.txt index 82f2acb3d374..d29e1e425518 100644 --- a/Documentation/devicetree/bindings/display/atmel/hlcdc-dc.txt +++ b/Documentation/devicetree/bindings/display/atmel/hlcdc-dc.txt @@ -15,6 +15,13 @@ Required children nodes: to external devices using the OF graph reprensentation (see ../graph.txt). At least one port node is required. +Optional properties in grandchild nodes: + Any endpoint grandchild node may specify a desired video interface + according to ../../media/video-interfaces.txt, specifically + - bus-width: recognized values are <12>, <16>, <18> and <24>, and + override any output mode selection heuristic, forcing "rgb444", + "rgb565", "rgb666" and "rgb888" respectively. + Example: hlcdc: hlcdc@f0030000 { @@ -50,3 +57,24 @@ Example: #pwm-cells = <3>; }; }; + +Example 2: With a video interface override to force rgb565; as above +but with these changes/additions: + + &hlcdc { + hlcdc-display-controller { + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_lcd_base &pinctrl_lcd_rgb565>; + + port@0 { + #address-cells = <1>; + #size-cells = <0>; + reg = <0>; + + hlcdc_panel_output: endpoint@0 { + reg = <0>; + bus-width = <16>; + }; + }; + }; + };