From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 03B0DC0502F for ; Mon, 29 Aug 2022 04:49:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229661AbiH2Eta (ORCPT ); Mon, 29 Aug 2022 00:49:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48172 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229620AbiH2Et2 (ORCPT ); Mon, 29 Aug 2022 00:49:28 -0400 Received: from NAM10-BN7-obe.outbound.protection.outlook.com (mail-bn7nam10on2045.outbound.protection.outlook.com [40.107.92.45]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3644142AF5; Sun, 28 Aug 2022 21:49:25 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=DLLZg3Q8GIUlyzpDCwBx7qZgOtkqcqy9qUHwd7E1T9Cp79FE0HjHnvwAxZbQJNg7FW2JS3uI19BDYZT/XdkrQYfquTn5qyCd8q8yaT7gfa2zv8EfOimtBa1gHX2BO8j31HEzVQQNt19KmUmifUmlZSX+SXKbHPp94BdN6o1i3yFzBxfxSxY4/xMEsgXAOLrt7eKDreQPVuRO2L27jnRnXLv70Mcj0yawQ8xOazv1gEowVV8Aa+TfCoSApGCVxoCQBcVlt8T7M5f8hPUlomWZNhIzn96snofro1mNLvkTN68GcKFiH+Jl9GvPidITjV/zeq4Giq38fvOYveDzhsfEbQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; 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=ATS5cyDuCURjN2UwYtZ60AD6HueY6fEt2Y9LTSEdJI0=; b=BX2jyALe7OECcVVe4OGu7MytnMdEh+B9AHlOluzhygta6jy1y+UCbHvNp0QIgtXOi6F8V2JlPaQv6QhggwLK8Th7aB+hxbPBuVoM7Us7SKyKDr8Vvak02fL9x7gETv+AxoOXBGpQIYGVc5FnOYjMNPKV7Xcy1KQnvUr94BIlap3lu6CkWChoQGlZelF2UNX4wcCjx/zjDViQoHJ+ZnZNA8Yo5qb7Sq4Cctwlodu979xCSacy5TKo3Qracu/VN3r9RQfq5IuyITzqKadF4AB3Q+Fs9JEcblqzmETJMjiz8p7e1GNvxU77yz30pr0DDOyGQyIIziZCxgYhysSthYxQIA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=amd.com; dmarc=pass action=none header.from=amd.com; dkim=pass header.d=amd.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=ATS5cyDuCURjN2UwYtZ60AD6HueY6fEt2Y9LTSEdJI0=; b=b1vb+NzpP/TVXu6LSErGSjp8Hhumzc2y8DAu0vPHXMTjtAWLREeIR0YCwH10wYf6N4ax2BQUQrLAg0tbhvcFW188jQiwlvZvm9SMgK3u27VHR5IeWUWQxtDJKDX0Hc4oFPphmpalmWVkNOlO4DyG4JYt2612QsU5SeiMEmTqsHg= Received: from DM6PR12MB3082.namprd12.prod.outlook.com (2603:10b6:5:11b::12) by DM6PR12MB5567.namprd12.prod.outlook.com (2603:10b6:5:1ba::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5566.15; Mon, 29 Aug 2022 04:49:22 +0000 Received: from DM6PR12MB3082.namprd12.prod.outlook.com ([fe80::4c82:abe6:13a6:ac74]) by DM6PR12MB3082.namprd12.prod.outlook.com ([fe80::4c82:abe6:13a6:ac74%3]) with mapi id 15.20.5566.021; Mon, 29 Aug 2022 04:49:22 +0000 From: "Gupta, Nipun" To: Jason Gunthorpe , Robin Murphy CC: Saravana Kannan , Greg KH , "robh+dt@kernel.org" , "krzysztof.kozlowski+dt@linaro.org" , "rafael@kernel.org" , "eric.auger@redhat.com" , "alex.williamson@redhat.com" , "cohuck@redhat.com" , "Gupta, Puneet (DCG-ENG)" , "song.bao.hua@hisilicon.com" , "mchehab+huawei@kernel.org" , "maz@kernel.org" , "f.fainelli@gmail.com" , "jeffrey.l.hugo@gmail.com" , "Michael.Srba@seznam.cz" , "mani@kernel.org" , "yishaih@nvidia.com" , "linux-kernel@vger.kernel.org" , "devicetree@vger.kernel.org" , "kvm@vger.kernel.org" , "okaya@kernel.org" , "Anand, Harpreet" , "Agarwal, Nikhil" , "Simek, Michal" , "git (AMD-Xilinx)" Subject: RE: [RFC PATCH v2 2/6] bus/cdx: add the cdx bus driver Thread-Topic: [RFC PATCH v2 2/6] bus/cdx: add the cdx bus driver Thread-Index: AQHYskryPWbD9sL0uUGy0CZ+78RqoK2zOJuAgAeq3xCAAA5ggIACkHJAgAB+fACAAL3fAIABQH2AgAAWLYCAAEX8AIAAemdA Date: Mon, 29 Aug 2022 04:49:21 +0000 Message-ID: References: <20220817150542.483291-1-nipun.gupta@amd.com> <20220817150542.483291-3-nipun.gupta@amd.com> <20220824233122.GA4068@nvidia.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_4342314e-0df4-4b58-84bf-38bed6170a0f_Enabled=true; MSIP_Label_4342314e-0df4-4b58-84bf-38bed6170a0f_SetDate=2022-08-29T04:51:13Z; MSIP_Label_4342314e-0df4-4b58-84bf-38bed6170a0f_Method=Standard; MSIP_Label_4342314e-0df4-4b58-84bf-38bed6170a0f_Name=General; MSIP_Label_4342314e-0df4-4b58-84bf-38bed6170a0f_SiteId=3dd8961f-e488-4e60-8e11-a82d994e183d; MSIP_Label_4342314e-0df4-4b58-84bf-38bed6170a0f_ActionId=4a08066b-00b3-4d62-9578-ac4e04788c0c; MSIP_Label_4342314e-0df4-4b58-84bf-38bed6170a0f_ContentBits=1 authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 0e8b8e6d-4816-4f36-6da2-08da8979d727 x-ms-traffictypediagnostic: DM6PR12MB5567:EE_ x-ld-processed: 3dd8961f-e488-4e60-8e11-a82d994e183d,ExtAddr x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM6PR12MB3082.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230016)(4636009)(39860400002)(376002)(396003)(346002)(136003)(366004)(38070700005)(4326008)(76116006)(66946007)(66556008)(66446008)(64756008)(8676002)(122000001)(38100700002)(86362001)(33656002)(83380400001)(186003)(478600001)(55236004)(53546011)(26005)(6506007)(7696005)(41300700001)(71200400001)(9686003)(110136005)(316002)(54906003)(55016003)(2906002)(66476007)(7416002)(5660300002)(8936002)(52536014);DIR:OUT;SFP:1101; x-ms-exchange-antispam-messagedata-chunkcount: 1 x-ms-exchange-antispam-messagedata-0: =?us-ascii?Q?OkVs8K7psoANwjw5KQ+6Pu/vfo7tHPIvT5niP0HHSj3QxCWZe/EGZsoXzaLP?= =?us-ascii?Q?dhf3FABpbzq1nhsXlOFYZcmYSp3diV1zYIhAcv5GZSt0ZqgGVl9b1GNjGo71?= =?us-ascii?Q?fh9tfgoZSW+zgPnPanqFKSztJ8fKf69rW9xx76bCVj33OOfh9EWAAbVCJl2S?= =?us-ascii?Q?Y8PH9tQhrzy6V05bo4SdOWM5dcyBQQ8FKT/ygzUE72I/uCiZomaGvcv26ZFV?= =?us-ascii?Q?MLcqEMzowK+XW5E1QzfeKvDdhcz5f6cPBtf29gaD+4OE7oRky42/9fl5rKiQ?= =?us-ascii?Q?Vfu6lUWWhj0ZMKtO4ga/t5BJuf3UqZsaQp9mzZF93zpb9yGwdqS1qQpE4UfA?= =?us-ascii?Q?PcUmCNwue7QUIrPJwIisAzkhFMNM0ym8qHGwMqb5no4WNPJkPa0HuKUzhSIu?= =?us-ascii?Q?Z4B9RUc6FHqeTXJJXLoSzA7Sqr09Uqzl9qJ2SS5x4A9GMO9kCXrSQH7+Tsq9?= =?us-ascii?Q?emOWHcXF0olwl9jsZrdBGCxH03yRniAgCXTqztmI82yWXdb8D04WQftqYjVw?= =?us-ascii?Q?b4yYA6dzp0vFoQ9+jlC100EN/USfalaorSdOjZl9BJ3JakX/w0xLJZvOPeji?= =?us-ascii?Q?RA893/YaBoPxgmSb0jHEL8g90tp3Oyxn2CkvayEbEiY+dNuHEycbxs8RyNGP?= =?us-ascii?Q?MfXjRP18zJd8EFkrblGZ96y/Tp0h2I2jgGGbka+zZ6A3puoFlcWAc+PeFewe?= =?us-ascii?Q?iVfb+6KjIgLjaZzN6co8DZOTBKpTq8nz3eG5CDYgZPT8StJjChkoJ+S1QVBo?= =?us-ascii?Q?PBBkajQhrHUzcjWbilFDiVuMsEsB9w+XHBreIWPf2tV49Qbp3K3IxR3R8fFH?= =?us-ascii?Q?3Vdw1vw+lUAAePcRVSy+KcjdmlBe1lOI2HwaMFKpmS11AOnpxft3SHs+MlnM?= =?us-ascii?Q?z2YSNY5aG8LsGO/9qW9m0upPxXpVSjKTJMOzhFU7EvphZxoQzQd59x2lxkc3?= =?us-ascii?Q?zBrn87Edi9TmYx4O2JjMyjY89dzt/8AcF2FPRca6WOvWaamHn+LAAs56bt6O?= =?us-ascii?Q?p/uqyphC6L5OyJFSJeiSCfBAkv+kSH/Tbiqiu9RMqb7K3wMT9WkLhz/y3Bxg?= =?us-ascii?Q?W9w4a7ZYNikBOw9J2GEAONO81Wx8G28aCy41Gdxv4hdWUdDI7d3FUV28S2V6?= =?us-ascii?Q?tB/npo01lqeY3V04Ei3B4GnI11IrGnB/qBwZuGNEsw8PxwaRNlwaVM0ltcxv?= =?us-ascii?Q?8H/X//8YMMJyAdmvranRc+LrD68NsE+mO7DNEKZMRINzegNDFfd6uTS4G39x?= =?us-ascii?Q?In9FfJoJXVSoiuc5oqx2YIkrwvG86YMd14Ewj+W5rM3W3wVDZi7SKr7dhebZ?= =?us-ascii?Q?74KPXpxKcw4i/f6ViRr3zlxaclmJ7dqqLakjT/ar05v3io1ymeDSJ9InYyvf?= =?us-ascii?Q?kyl7rVVt0v9pqeSEVh1v7S1hHXeJHO6d/qX5GjUxG5hYbtDEdXBJSNRcBzyP?= =?us-ascii?Q?be5dOCt3sbGa3vnSqfEFE4tty1eNBbmyW5aUIxDzkWC8/z3/1w+oOA6jfuja?= =?us-ascii?Q?WJmZqTeaLqPL6h0LachOo+RjEwDg5zBYmTp2BpkogyYwDtUVrArYpiCst1bQ?= =?us-ascii?Q?ffPEfg8f1UGmvz23OGo=3D?= Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM6PR12MB3082.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0e8b8e6d-4816-4f36-6da2-08da8979d727 X-MS-Exchange-CrossTenant-originalarrivaltime: 29 Aug 2022 04:49:21.9455 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: WTU6xdEwFUOggk5vW1K/tNY016LDyYdOtIFeiVVxRkQfthCKT9ZPqvFCV8DmlkAB X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB5567 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [AMD Official Use Only - General] > -----Original Message----- > From: Jason Gunthorpe > Sent: Friday, August 26, 2022 5:38 AM > To: Robin Murphy > Cc: Saravana Kannan ; Greg KH > ; Gupta, Nipun ; > robh+dt@kernel.org; krzysztof.kozlowski+dt@linaro.org; rafael@kernel.org; > eric.auger@redhat.com; alex.williamson@redhat.com; cohuck@redhat.com; > Gupta, Puneet (DCG-ENG) ; > song.bao.hua@hisilicon.com; mchehab+huawei@kernel.org; maz@kernel.org; > f.fainelli@gmail.com; jeffrey.l.hugo@gmail.com; Michael.Srba@seznam.cz; > mani@kernel.org; yishaih@nvidia.com; linux-kernel@vger.kernel.org; > devicetree@vger.kernel.org; kvm@vger.kernel.org; okaya@kernel.org; Anand, > Harpreet ; Agarwal, Nikhil > ; Simek, Michal ; git > (AMD-Xilinx) > Subject: Re: [RFC PATCH v2 2/6] bus/cdx: add the cdx bus driver >=20 > [CAUTION: External Email] >=20 > On Thu, Aug 25, 2022 at 08:57:49PM +0100, Robin Murphy wrote: >=20 > > To my mind, it would definitely help to understand if this is a *real* > > discoverable bus in hardware, i.e. does one have to configure one's dev= ice > > with some sort of CDX wrapper at FPGA synthesis time, that then physica= lly > > communicates with some sort of CDX controller to identify itself once > > loaded; or is it "discoverable" in the sense that there's some firmware= on > > an MCU controlling what gets loaded into the FPGA, and software can que= ry > > that and get back whatever precompiled DTB fragment came bundled with t= he > > bitstream, i.e. it's really more like fpga-mgr in a fancy hat? >=20 > So much of the IP that you might want to put in a FPGA needs DT, I > don't thing a simplistic AMBA like discoverable thing would be that > interesting. >=20 > Think about things like FPGA GPIOs being configured as SPI/I2C, then > describing the board config of SPI/I2C busses, setting up PCI bridges, > flash storage controllers and all sorts of other typically embedded > stuff that really relies on DT these days. >=20 > It would be nice if Xilinx could explain more about what environment > this is targetting. Is it Zynq-like stuff? This solution is not targeted for GPIO/SPI or I2C like devices which rely o= n DT, but would have PCI like network/storage devices. It is not targeted for Zynq platform. I have added more details on other mail. Please refer to that mail. Thanks, Nipun >=20 > Jason