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Wed, 20 Aug 2025 09:37:28 +0000 Received: from AM0PR02CU008.outbound.protection.outlook.com (40.93.65.4) by westeu11-emailsignatures-cloud.codetwo.com with CodeTwo SMTP Server (TLS12) via SMTP; Wed, 20 Aug 2025 09:37:27 +0000 Authentication-Results-Original: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=topic.nl; Received: from AM8PR04MB7779.eurprd04.prod.outlook.com (2603:10a6:20b:24b::14) by DU4PR04MB10861.eurprd04.prod.outlook.com (2603:10a6:10:592::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9052.13; Wed, 20 Aug 2025 09:37:25 +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 09:37:25 +0000 Message-ID: <3a4448a5-a01f-4d4e-a890-56eb9357abd3@topic.nl> Date: Wed, 20 Aug 2025 11:37:24 +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> Content-Language: nl, en-US Organization: TOPIC In-Reply-To: <1b517073-cadb-41e4-b470-54a6ad93dd59@kernel.org> Content-Type: text/plain; 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CTRY:NL; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:westeu11-emailsignatures-cloud.codetwo.com; PTR:westeu11-emailsignatures-cloud.codetwo.com; CAT:NONE; SFS:(13230040)(7416014)(14060799003)(35042699022)(376014)(1800799024)(82310400026)(36860700013); DIR:OUT; SFP:1102; X-OriginatorOrg: topic.nl X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Aug 2025 09:37:28.0039 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9448908c-aa24-44b5-97b4-08dddfcd2dac 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: DU2PEPF0001E9C0.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR04MB9510 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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 08:44, Krzysztof Kozlowski wrote: > On 19/08/2025 10:26, Mike Looijmans wrote: >> On 19-08-2025 09:51, Krzysztof Kozlowski wrote: >>> On 19/08/2025 09:46, Mike Looijmans wrote: >>>>>> + >>>>>> +properties: >>>>>> + compatible: >>>>>> + enum: >>>>>> + - ti,tmds181 >>>>>> + - ti,sn65dp159 >>>>> The driver contains: >>>>> + { .compatible =3D "ti,tmds181", }, >>>>> + { .compatible =3D "ti,sn65dp159", }, >>>>> + {} >>>>> so why is a fallback compatible not suitable here? >>>> I don't understand the question. The two are slightly different chips, >>> Your driver says they are compatible. No one said the same, but compati= ble. >>> >>>> so it makes sense to describe that in the DT. >>> Compatible devices should use fallback. There is plenty of examples (90= % >>> of all binding files?) including example-schema describing this. >> Please help me out here, I'm happy to oblige, but I don't understand >> what you're asking. >> >> To the best of my knowledge "fallback" compatible is when you write >> something like this in the device-tree: >> =C2=A0=C2=A0 compatible =3D "st,m25p80", "jedec,spi-nor"; >> Which means that we can use the "jedec,spi-nor" driver if there's no >> specific match for "st,m25p80", correct? > Yes. > >> I don't understand how that relates to your request, this is the first >> time I ever got this particular feedback. Looking at say the >> ti,sn65dsi83 driver, it does the same thing (supports the ti,sn65dsi83 >> and ti,sn65dsi84). >> >> Please explain or point me somewhere where I can find this? > I already pointed out to example-schema. > > 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 only= =20 supports "a" in its match table, and the devicetree entry must be either=20 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 the=20 driver to check the chip type and complain if it doesn't match the devicetr= ee.=20 If the wrong device is there, the most likely cause is that the input and=20 output buses got mixed up. That would also justify having separate=20 compatibles, right?