From nobody Fri Nov 29 00:33:14 2024 Received: from NAM12-BN8-obe.outbound.protection.outlook.com (mail-bn8nam12on2125.outbound.protection.outlook.com [40.107.237.125]) (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 41334175D2A; Fri, 27 Sep 2024 05:25:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.237.125 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727414730; cv=fail; b=a7IyqxyyOXxnddx7J9VlCQDWmpIVXEZgxDq8LNVyXo1P3ABKRohf9knjUVmkK/na7elW0grBMIGUrcxMGHybCB4D+jvhAW9wuGUyQARIPW4TvMd5XlUOKkxZy2xNmJdV7Yve3edXpDiCK5k9qqmtjin48h0coicH/SaXw+oLzrE= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727414730; c=relaxed/simple; bh=FjFBHd8GlrUZJGdbQwzFs15AuMCt8/AFfFjrB8fFYpI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=hR+VVLPPaeyhaX0r8Sy0d/xdXsGbUsMJm6HM9HhYM9q6kzlktkOGWtM/VIip6VKfsgA32JKnv1gUEfv+zFgNfQ9tmkhSIzv1MAn5Dx3NZpEI4AuYgmGrTGgE1cEHK/vtNtrrWeWwjw6fJ7wzLFNnqB4LKic6XZJ2sWwhbCJGi0g= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=kneron.us; spf=pass smtp.mailfrom=kneron.us; dkim=pass (1024-bit key) header.d=kneron.us header.i=@kneron.us header.b=Iw+QCB8m; arc=fail smtp.client-ip=40.107.237.125 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=kneron.us Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kneron.us Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=kneron.us header.i=@kneron.us header.b="Iw+QCB8m" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=jgBFuSI8zIyils+0tsL8uLBKrJlMGO+2oxqc+yUfOKoRQuSCS89tt0ojKK3PtCyS+1MZet+veydQRwAor9vxCNJwODKoVyU0A918nny6GEHTmzW5zYqfqUvp+tvMeLqO8QqPnBxsH+QErAUiRMDaDNBocc0uT6rBUEvoNe2DBQoNZg5G7NPIoUfRUxahRRkAsvIgP6D3jfDZJs3NSkF7vyrEAXdJx0qhMFFgF59U3Ij0UUAyoXmlq0UWz+wA/MoqjGx9LHbxFL0+rz3Mz8Q5fjIRFFR5dpkr/lV4hX3lWO2Bv88t9UIjIfjdHPeckWk65CqAELi90C1o33jHOmrJ8w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=HAmHFh1Z2we5MDHU+2+oQ/Ra37Q49NuUbopL+1TwJdo=; b=Jzy2wFWwm5zO5IlSnwQadQy+1aJEDXUXWJWwGtVxUpHh6Ypq1n/VpesNFKwGxbJz+5hOyngM2QC/o/REL1NfjJzXRzVf9XtgQzWTin5F6VZ213PKkux/6/kMxg7o6g/GFSnw4/PxxxoU3zBYHuWxyakqLmKKkKNBJOWnQflXReFAkCX92icYNtQJEaJ6KXW6mcXGcDODrn8OavsvlPUcjoOhvItAGTbnwYSPm+gVLB/Y+eFsiAXKK9iJ8qq5dwVyeHoLL3bOBN2WYnV9j/zeyn5grpQhlN3ocUZ7z3rQ2guCAIYa/ccGnetHIQVtAxPcTo9O6ltT9HAlLQpcuTvQXA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=kneron.us; dmarc=pass action=none header.from=kneron.us; dkim=pass header.d=kneron.us; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kneron.us; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=HAmHFh1Z2we5MDHU+2+oQ/Ra37Q49NuUbopL+1TwJdo=; b=Iw+QCB8mmCnUqrV9Bxh3kIOUU9KYIE3GCpeV5OxPu4pFXq+FEpE1ONQljUXJO60qsP01dDdumV7TK6olWPja6baegurXLCwPJ0Jlab6DkvhVQHuk0a8+A8VOyIW8JwP6chkWlQFHooJUA+/7oM+tRp2//jih3HuesOAK9te7HiE= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=kneron.us; Received: from IA1PR14MB6224.namprd14.prod.outlook.com (2603:10b6:208:42b::6) by DM4PR14MB5526.namprd14.prod.outlook.com (2603:10b6:8:bf::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7982.28; Fri, 27 Sep 2024 05:25:26 +0000 Received: from IA1PR14MB6224.namprd14.prod.outlook.com ([fe80::c527:653c:698d:3d94]) by IA1PR14MB6224.namprd14.prod.outlook.com ([fe80::c527:653c:698d:3d94%3]) with mapi id 15.20.8005.021; Fri, 27 Sep 2024 05:25:26 +0000 From: Michael Wu To: Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jarkko Nikula , Andy Shevchenko , Mika Westerberg , Jan Dabros , linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Morgan Chang , mvp.kutali@gmail.com, Michael Wu Subject: [PATCH v2 1/2] dt-bindings: i2c: snps,designware-i2c: add bus-capacitance-pf and clk-freq-optimized Date: Fri, 27 Sep 2024 12:22:16 +0800 Message-ID: <20240927042230.277144-2-michael.wu@kneron.us> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240927042230.277144-1-michael.wu@kneron.us> References: <20240927042230.277144-1-michael.wu@kneron.us> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: TYAPR01CA0148.jpnprd01.prod.outlook.com (2603:1096:404:7e::16) To IA1PR14MB6224.namprd14.prod.outlook.com (2603:10b6:208:42b::6) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA1PR14MB6224:EE_|DM4PR14MB5526:EE_ X-MS-Office365-Filtering-Correlation-Id: ffa99bfd-9613-4c7e-362c-08dcdeb4cb57 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|52116014|376014|7416014|1800799024|80162021|921020|38350700014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?6rtkLE1SUsYPjpl7G5KWiLMVO+mz92PBIxWMnY1CO1RQVFhCbrMYA+v2UMXh?= =?us-ascii?Q?p/fhh5jTsXrJRG41xSMJrrSJ1CT/qfSXvhZvClFc/ACZ6osiJejlCQTST+0h?= =?us-ascii?Q?3DCanZ1bHfyBdxS4lhBNzGMb3HeG8NKiIWtXvpBrueEKWby7+/h7HPERjBF1?= =?us-ascii?Q?zEbXRGLkV3IvVpDNSJgFpX6ysL75zUpQkxv5HHZibxyTXXV4c8QfC79EPGPR?= =?us-ascii?Q?vkHy+6EWxeWWOF9NvqdZF45ljywBUT1kmuUPnylaQNHnAYJ6lP1sb7G301oq?= =?us-ascii?Q?4Vps1OdgF/Gst07SQXcXMMkwjBkXOHYBSnS0V4VFoIincVki05gYDlDtntf7?= =?us-ascii?Q?Qr0oQ8a/2tO0WiQFQtBficRI6pB+O1kg/qJxbE0yyoyfbfgS08qOp3VyW97g?= =?us-ascii?Q?8hiaP/Y4H58kdwoGYgSrgH3ns1a6pbh2NcDxvS93AUTQAGTeMI8C6dtmRJRW?= =?us-ascii?Q?gGe9WOi2EysO9u1tRfpL+l6Iuv0SQMVKWTE7lr6y3osuZ/91Uu4pGBXIBeif?= =?us-ascii?Q?Nbw7NFl2JzIQaLvtFhs5ix6QQRZir2wJ4GoExghiSC+j8u7vbKS70pBIMyhB?= =?us-ascii?Q?Pl7RCGBsYvsplWiqDrl4TLY20f5TkieE2vDdlktHv/8ta9nIasq95lZFcG2q?= =?us-ascii?Q?eMEhOhRY0Y8rx24XXMRT07qIDTtDF7UHk/xWfMZ0Q7MID8LChq5qU5SDWakb?= =?us-ascii?Q?R5kjNc0QWc2sNWCvo3//1RcvxKGxogcUGYDpmLdfhfDbz5R9HNnN2P19Wygl?= =?us-ascii?Q?VA+3HntrPcf1dJI0X+ThPJJN9UQgWHbyrUn58lM/uuplJKFqIktFmRO1HvDL?= =?us-ascii?Q?kGXxpWzZIIE2+YT25TntkuL0oDK9lsS88cF5yGdYJqCM6rHJhW1Blqhrbhrn?= =?us-ascii?Q?Piyn4TWwSUvcpkyDifmRxvU5GSbEGLiEfm7OqueNkraiSYeM8jBvWq6fbJy5?= =?us-ascii?Q?2BG2bIE8Mg6JD4TlFHQ+gsM7sT+V3CzCnVoH66rWtyg08ChILGNryARC/GYo?= =?us-ascii?Q?vX8d5sgBbJ+zXdSwzhwUU7GuUyLhV/X2oHXwWMoLTly/nwLqebEq8DBmjJ4u?= =?us-ascii?Q?SOUMqQDl9oe/0pwLDSgxfjdBLEEe2ldiz8wSuoP3RBAcK6LJU1DwkVq74nyZ?= =?us-ascii?Q?7SvtuOBOnBxlktd/LVANd3eL1lgk9nTqYGEPul2UFnVM0v16IJWMNRAbRgqL?= =?us-ascii?Q?rdARZMDmbRCVP4CJFEhA99GWVxvn4cddrqcVzFCNnXGQ/Vp8+aT+pAnXI+T0?= =?us-ascii?Q?un7NRr+MZvsNiVglPA2rqTKfcFMlUCy8aOvFhkDWWTvnMnwadjAN1KRYb3U+?= =?us-ascii?Q?MgFQZz+Doi0sIM1n5+G8Ajp49W++QDScXCPJbbELKyHcMDQtXJd7FaXzBLgX?= =?us-ascii?Q?Zap7VqmFyy/uA6ov8DViVYb+Z6a1YSkzp+2eUcLxOxkcgpIYtJkcOOHdntng?= =?us-ascii?Q?mfnzTE+ipWE36MqxoI6yahp3teXwd2Tx?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:IA1PR14MB6224.namprd14.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(52116014)(376014)(7416014)(1800799024)(80162021)(921020)(38350700014);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?jZ8txIOmJdpC8Ova//92kILAN4XVyiMvwvhip9brnspSrxT+Kiqd+LRYMXW6?= =?us-ascii?Q?hf58gwUqTzHLiM6iBCm9zPf7U82v5ZEmpM8+YEOCDldIVZPprte6QRwe5sPm?= =?us-ascii?Q?qpXYKw8hpntXe8JVN4hMHunbLTjAEaGys86k15zXPuXmqRURSN5uygNRbfmj?= =?us-ascii?Q?sN5SVeCwgR7/XAlQmsIDrRkLRk9Kbi8mAo8iUnfH2eXwua43xp9SsOLq/Eg9?= =?us-ascii?Q?Fh4+oDEjfYeWBmz+YcT0C2fDYzhbGgUBIH138TOuL0ifpZ0bGO0F0XemunPc?= =?us-ascii?Q?X1b1QJWCDW/YcN73lq3wv+XsWiAWBiawUjqeuVF881+JpsUfE7CcLfMcaRaB?= =?us-ascii?Q?yZTnmZk//veQRKQBhlM9WFTAvmIsOv907NhBsPkYUl2sAYKvLWEBwaDt6Q47?= =?us-ascii?Q?yLUtC+WCshtrNPeokhw2bVFVYx+4VDgZ0gXm9XeEmhJKpAvG9xjnrRkAmyaZ?= =?us-ascii?Q?eSQiOljJSlt1YlP1+qEJUwlpcTKXPcc6ylTQ0MUMbbouw9MSSrO85+2/S8NV?= =?us-ascii?Q?qwpmZUBQ7Ws+gyQfIaiTFf9AZMNnq1GHFP3RU75MHEeXvvnJC28LaAsel7ni?= =?us-ascii?Q?En1EQ7NQ4f4+DzZ+oSaZ56eMOEvzGEsdNnTUitm6L7EEYZzRIKxHRsAfKoxk?= =?us-ascii?Q?lhebxkouUgpBQPBEHKhuR38mS+zSCq5thajdcIAXCGhkT6LFZ5hOPh2aRS4K?= =?us-ascii?Q?rt3m0GkOdLDVtW8GK1SMotHnNHwbgk9u/tWAmmXcjNCIIfgU1Y2cPAo/6XPe?= =?us-ascii?Q?jgTV7uWfTB+Yx5tIC4IRZ2mgod3AXCZyEpecuTmSKp2Nu2UwUVtU2zbsw0l/?= =?us-ascii?Q?rRBjDb4vc3bUcgPfFkPzo7VMz4rAXGcThCzwGRdIpXqaNqO0TuPhlSkZK32d?= =?us-ascii?Q?nXJGh/W3rQKAhFNPpVx8ShCZ0elj3hSH3NXT0qzaEp8AsF3XSUyAoIs9L6zX?= =?us-ascii?Q?es+D9cpb55fGiq+8wP8XYUOgyiU3mLjydZGr96FvK2ZwKbCLO/Xb973m27BH?= =?us-ascii?Q?+xVvJrfIYxQ696T9+jCUqa4wgCmwSVf68kCMoIJDVVn233S6Bfs25kWcYkS2?= =?us-ascii?Q?xiW3OUpzAFEFVj9hkiPqlS8CVi52IVc5Y0YTTUXBpJSc9QUl6nYiTbdd3lN2?= =?us-ascii?Q?/pof40ry6Oqm+b5nWlROhaPiW8IY99tSJGgari+RsYq3SSzPnLvq9Ecix+0I?= =?us-ascii?Q?WnOaMv9bGlnO7VtRyo8e7fHzlVuHip+oAtqWvuHjg1KA20g8f2PY6FhDZVCi?= =?us-ascii?Q?SjbCzGONpDUCfdV3Fy2OPTyd1Ghu6TOUZx1l7FgGA2XLzbVYfxJ9ub0tAsjR?= =?us-ascii?Q?bcioxDjcPUpN2U0Bi+BxO22Z6eb/HjakfJnXCX+on0OTKTNoGTi+CeQAb3Fy?= =?us-ascii?Q?R7XfwgRzD4vN7E6sc5Va22kGbzZaA4BN0jL1jRQYeyGQK7cHJQU33IgnHCh8?= =?us-ascii?Q?GS3fkbGBq1rfwy6kzKSiwjSFrl4iLvmH0G8PNI6OOPgc/3DpGUvZlGnORrwT?= =?us-ascii?Q?6vMu+xzUuWJsx50Qv9gEQir2PR66ooXTurWLWGeYkS3L6OqZtkeVXqqHYinu?= =?us-ascii?Q?SGXcsUyjx0kLqu2jfW7eWYMXymnY9JAZHFHnFUG8?= X-OriginatorOrg: kneron.us X-MS-Exchange-CrossTenant-Network-Message-Id: ffa99bfd-9613-4c7e-362c-08dcdeb4cb57 X-MS-Exchange-CrossTenant-AuthSource: IA1PR14MB6224.namprd14.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Sep 2024 05:25:26.7358 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: f92b0f4b-650a-4d8a-bae3-0e64697d65f2 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: F9Hd8wKD/zLDr1uohUwcTnjgjun29yvd5TmGswJGsnZFV8f8rJCZN2x0vgdpaOMz63J8AlplxP3EaL0fKGiHoA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR14MB5526 Content-Type: text/plain; charset="utf-8" Since there are no registers controlling the hardware parameters IC_CAP_LOADING and IC_CLK_FREQ_OPTIMIZATION, their values can only be declared in the device tree. bus-capacitance-pf indicates the bus capacitance in picofarad (pF). It affects the high and low pulse width of SCL line in high speed mode. The only legal values for this property are 100 and 400, which are used to calculate the tHIGH and tLOW periods for high speed mode. This property corresponds to IC_CAP_LOADING. clk-freq-optimized indicates that the hardware input clock frequency is reduced by reducing the internal latency. The property affects the high period and low period of the SCL line. The property conrresponds to IC_CLK_FREQ_OPTIMIZATION. Signed-off-by: Michael Wu --- .../bindings/i2c/snps,designware-i2c.yaml | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/Documentation/devicetree/bindings/i2c/snps,designware-i2c.yaml= b/Documentation/devicetree/bindings/i2c/snps,designware-i2c.yaml index 60035a787e5c..fc19e6a8b306 100644 --- a/Documentation/devicetree/bindings/i2c/snps,designware-i2c.yaml +++ b/Documentation/devicetree/bindings/i2c/snps,designware-i2c.yaml @@ -87,6 +87,20 @@ properties: This value is used to compute the tHIGH period. default: 300 =20 + bus-capacitance-pf: + description: | + This property represents the bus capacitance in picofarad (pF). It + affects the high and low pulse width of SCL line in high speed mode. + The only legal values for this property are 100 and 400, which are u= sed + to calculate the tHIGH and tLOW periods for high speed mode. + default: 100 + + clk-freq-optimized: + description: | + If the hardware input clock frequency is reduced by reducing the + internal latency, this property must be declared in the device tree.= It + affects the high period and low period of SCL line. + dmas: items: - description: TX DMA Channel --=20 2.43.0