From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.tq-group.com (mx1.tq-group.com [93.104.207.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D52624EB30; Thu, 16 May 2024 12:07:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=93.104.207.81 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715861260; cv=none; b=siHZ62iT2o5SI0qcpHRGPfGmW0St/jSIVvdMlycrnjqfE0w2phZY2Oq2YaQSnmls+VSZV5uAd0RNdGmMZTg33Kc1Aw+OVrqYMrXw3g19anyk31t9NwbbTnvRX7GmQN1mT3Ta8Y45ua+LOZLQxVTEb9CWDnCg1Jr43vlElmDVGmQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715861260; c=relaxed/simple; bh=vcdsIGqZ5qz1syFN4U6rshX8LYDZBqv5t9KYXC8SXXE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=IuJAYv7XZXzr1VONFq1CxWoCZLyhRF4Zr9VdtmXcE2oz/2ABckpaWNnEkou+w4sUyGr0dotGnJIwFgr7a2m/eWnLdoQfeHzsNVGX7soMh6UHrIf01O/WPcpgEg6W5LSck/VFoIy1XlYHPjILtGPTNsfAjUHyFHtKNeCzO2JTL48= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ew.tq-group.com; spf=pass smtp.mailfrom=ew.tq-group.com; dkim=pass (2048-bit key) header.d=tq-group.com header.i=@tq-group.com header.b=NbGJocm/; dkim=fail (0-bit key) header.d=ew.tq-group.com header.i=@ew.tq-group.com header.b=NwdinzhA reason="key not found in DNS"; arc=none smtp.client-ip=93.104.207.81 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ew.tq-group.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ew.tq-group.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=tq-group.com header.i=@tq-group.com header.b="NbGJocm/"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=ew.tq-group.com header.i=@ew.tq-group.com header.b="NwdinzhA" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tq-group.com; i=@tq-group.com; q=dns/txt; s=key1; t=1715861257; x=1747397257; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=vcdsIGqZ5qz1syFN4U6rshX8LYDZBqv5t9KYXC8SXXE=; b=NbGJocm/nYhNY8ItDCPxBLvGN/h2O8pG6Tb61+itiGHWN5Di3vh6mmHp x/V/t1HW2vTb9q8l4eOndww+mbnvRiH0bWOUhL9tCS5bdLoADUBMEHVwX TJc57BscwaO+X89w9y/yWfk/f9HmGMVEcZGelYBtIiV/oM/N0kAHXXMKf 8you2V+8FWx2WhDHp3LpS74Z6TIUSFNS5kS9vFS3J/2FSaW2YEZjxXjR9 v0C6AWlpHmdaBwZ2b0Ua23KIZosWEypKUwaVYopftLn4jwtO+z01BTmjE U1zcSz96LBITVUuUFvTndyvAdfC60aghjEjnmCS+Xtwg4fQ2nX6WnvveQ g==; X-CSE-ConnectionGUID: RksVlVebSziJVsdXvJdhKg== X-CSE-MsgGUID: tlJ8O3lfQa60hJSqAFcjvg== X-IronPort-AV: E=Sophos;i="6.08,164,1712613600"; d="scan'208";a="36937146" Received: from vmailcow01.tq-net.de ([10.150.86.48]) by mx1.tq-group.com with ESMTP; 16 May 2024 14:07:34 +0200 Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 23DB6174204; Thu, 16 May 2024 14:07:29 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ew.tq-group.com; s=dkim; t=1715861250; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=vcdsIGqZ5qz1syFN4U6rshX8LYDZBqv5t9KYXC8SXXE=; b=NwdinzhA0JeGGqgMmGZt/8JCtKF1X2eXOUGriZ8xtAglud6v3UTZWqQ8nz3R/y1Cw84O0/ U4AYI1vUo8hItVABU9FgsRWutlaKB1BUaGlmIa8/tNLu1QkzFNsg/zrg/Q8vn7H8rzM1Ux 1czmd7PK1P2/3MC4JvPrYFlmQQkmPknYAlF2fYkaaR41LZd7yHXpNBJ7Eb5Iybqo90jzKv 2K17rWErAszcPe/4kSGnP4KvdiZjQ+b9A7eq7qF/NTwAJPdIslPYmPxO3xgXloZc9MSB7j Ms7+cYsk+KncudPPRocDPTasNeoBkmM+AavZOKM8V2OfnqXP6he/PKkW80BAAg== From: Alexander Stein To: Marek Vasut , Francesco Dolcini , linux-arm-kernel@lists.infradead.org Cc: Rob Herring , Conor Dooley , devicetree@vger.kernel.org, Shawn Guo , Sascha Hauer , linux-kernel@vger.kernel.org, imx@lists.linux.dev, kernel@dh-electronics.com, Pengutronix Kernel Team , Krzysztof Kozlowski , Fabio Estevam , linux-arm-kernel@lists.infradead.org, Ahmad Fatoum Subject: Re: [PATCH] arm64: dts: imx8mp: Enable HDMI on i.MX8MP DHCOM PDK2 and PDK3 Date: Thu, 16 May 2024 14:07:34 +0200 Message-ID: <5724851.tdWV9SEqCh@steina-w> Organization: TQ-Systems GmbH In-Reply-To: <69c3517c-0fa4-4e0d-9515-21adfb6730a8@pengutronix.de> References: <20240514010706.245874-1-marex@denx.de> <69c3517c-0fa4-4e0d-9515-21adfb6730a8@pengutronix.de> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="iso-8859-1" X-Last-TLS-Session-Version: TLSv1.3 Hi everyone, Am Donnerstag, 16. Mai 2024, 13:46:33 CEST schrieb Ahmad Fatoum: > On 16.05.24 13:44, Marek Vasut wrote: > > On 5/16/24 1:36 PM, Ahmad Fatoum wrote: > >> Hello Marek, > >=20 > > Hi, > >=20 > >> On 16.05.24 13:14, Marek Vasut wrote: > >>> On 5/16/24 10:00 AM, Francesco Dolcini wrote: > >>>> Hello Marek, > >>> > >>> Hi, > >>> > >>>> On Tue, May 14, 2024 at 03:06:42AM +0200, Marek Vasut wrote: > >>>>> Enable HDMI output on i.MX8MP DHCOM PDK2 and PDK3. The I2C5 on PDK2= and > >>>>> I2C mux port 1 on PDK3 respectively are used in regular I2C mode in= stead > >>>>> of HDMI DDC mode to permit connection of other I2C devices on those= buses. > >>>> > >>>> Are you able to read the HDMI EDID with such configuration? I have t= he > >>>> patch ready for verdin imx8mp, I just did not have time to figure out > >>>> this last details. > >>> > >>> Yes with ddc-i2c-bus in hdmi_tx{} node, no with ddc-i2c-bus in connec= tor node. Maybe that's what you're running into ? The DW HDMI core needs th= e ddc-i2c-bus property in hdmi_tx{} node if you use non-native I2C bus for = the DDC channel. > >> > >> What benefit does the hdmi-connector provide over just omitting it? > >> Just for documentation purposes? > >=20 > > I was under the impression describing the hardware in DT in full was th= e best practice (TM), hence it is in full here. >=20 > Sure, I am just wondering what effect, if any, it has in how Linux interp= rets > the device tree. I have an i.MX8MP board with HDMI as well, but without > connector (yet). AFAICT having a hdmi-connector has no effect at all. Linux drivers are not using it. Best regards, Alexander =2D-=20 TQ-Systems GmbH | M=FChlstra=DFe 2, Gut Delling | 82229 Seefeld, Germany Amtsgericht M=FCnchen, HRB 105018 Gesch=E4ftsf=FChrer: Detlef Schneider, R=FCdiger Stahl, Stefan Schneider http://www.tq-group.com/