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Wed, 20 Aug 2025 12:10:05 +0000 Received: from AM8PR04MB7779.eurprd04.prod.outlook.com ([fe80::7417:d17f:8d97:44d2]) by AM8PR04MB7779.eurprd04.prod.outlook.com ([fe80::7417:d17f:8d97:44d2%7]) with mapi id 15.20.9052.013; Wed, 20 Aug 2025 12:10:05 +0000 Message-ID: <34d4e81a-d4fa-47f2-85d1-ef01c9c21173@topic.nl> Date: Wed, 20 Aug 2025 14:10:04 +0200 User-Agent: Mozilla Thunderbird From: Mike Looijmans Subject: Re: [PATCH 1/2] dt-bindings: drm/bridge: ti-tmds181: Add TI TMDS181 and SN65DP159 bindings To: Krzysztof Kozlowski , Conor Dooley CC: dri-devel@lists.freedesktop.org, Andrzej Hajda , Conor Dooley , David Airlie , Jernej Skrabec , Jonas Karlman , Krzysztof Kozlowski , Laurent Pinchart , Maarten Lankhorst , Maxime Ripard , Neil Armstrong , Rob Herring , Robert Foss , Simona Vetter , Thomas Zimmermann , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250812145256.135645-1-mike.looijmans@topic.nl> <1b153bce-a66a-45ee-a5c6-963ea6fb1c82.949ef384-8293-46b8-903f-40a477c056ae.3b7d4319-e208-470d-9ada-585343a64822@emailsignatures365.codetwo.com> <20250812145256.135645-2-mike.looijmans@topic.nl> <20250812-designing-tyke-db85527b373d@spud> <9fba4917-a24f-4fee-8f1a-7509a0bc542e@kernel.org> <2d694c9c-704e-4353-8b57-de83eb5a7f96@topic.nl> <1b517073-cadb-41e4-b470-54a6ad93dd59@kernel.org> <3a4448a5-a01f-4d4e-a890-56eb9357abd3@topic.nl> <2e16f923-5dad-4c8d-80d7-667dbece92c9@kernel.org> Content-Language: nl, en-US Organization: TOPIC In-Reply-To: <2e16f923-5dad-4c8d-80d7-667dbece92c9@kernel.org> Content-Type: text/plain; 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X-OriginatorOrg: topic.nl X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Aug 2025 12:10:08.1063 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0be47dd5-07f9-4d78-5cb9-08dddfe28150 X-MS-Exchange-CrossTenant-Id: 449607a5-3517-482d-8d16-41dd868cbda3 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=449607a5-3517-482d-8d16-41dd868cbda3;Ip=[20.93.157.195];Helo=[westeu11-emailsignatures-cloud.codetwo.com] X-MS-Exchange-CrossTenant-AuthSource: AMS0EPF00000192.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR04MB8515 Met vriendelijke groet / kind regards,=0A= =0A= Mike Looijmans=0A= System Expert=0A= =0A= =0A= TOPIC Embedded Products B.V.=0A= Materiaalweg 4, 5681 RJ Best=0A= The Netherlands=0A= =0A= T: +31 (0) 499 33 69 69=0A= E: mike.looijmans@topic.nl=0A= W: www.topic.nl=0A= =0A= Please consider the environment before printing this e-mail=0A= On 20-08-2025 13:35, Krzysztof Kozlowski wrote: > On 20/08/2025 11:37, Mike Looijmans wrote: > Please fix your email client not to attach such top signature. > > ... It's actually the company IT that does that, but I'll keep doing my best to= =20 prevent it (though sometimes it kicks in anyway). > >>> Also, e.g. first file in iio/adc: >>> adi,ad4000.yaml >>> >> I think I get it. Instead of having compatibles "a" and "b" the driver o= nly >> supports "a" in its match table, and the devicetree entry must be either >> compatible=3D"a"; or compatible=3D"b","a". Using compatible=3D"b"; would= be disallowed. >> >> I actually planned (I have implemented it locally already for v3) for th= e >> driver to check the chip type and complain if it doesn't match the devic= etree. >> If the wrong device is there, the most likely cause is that the input an= d >> output buses got mixed up. That would also justify having separate > I don't understand why. I don't get what is input and output bus. > > Either devices are compatible or not. > > If you can check which device you have via registers, then usually they > are compatible. > They have almost the same registers, but they are intended for opposite sid= es=20 of the HDMI cable. The DP159 variant expects to drive signals into the cabl= e,=20 while the TDMS181 expects to receive its input from the cable. If you=20 encounter a TMDS181 where you expected the other, something's wrong with yo= ur=20 board (the board manufacturer placed the wrong chip) or your devicetree (e.= g.=20 you mixed up the I2C addresses of the receiver and sender). In such case, t= he=20 chip will happily do its thing, but the system may not work as expected. Valid setups: CRTC -> pcb -> DP159 -> cable -> hdmi-monitor CRTC -> pcb -> cable -> TMDS181 -> hdmi-to-lvds -> panel CRTC -> pcb -> DP159 -> cable -> TMDS181 -> hdmi-to-lvds -> panel