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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2004FC3DA7F for ; Mon, 5 Aug 2024 11:02:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:MIME-Version: Content-Transfer-Encoding:Content-Type:In-Reply-To:From:References:To:Subject :Date:Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Vbo23A1SlkC8BWYfrG46Q2gif3cx7rdi9xwlhU59K5w=; b=cvMlYeh0gjJj3I4nenCWNlPbFk 440a/TObFy0oM1TbRh5gRlyr9eMq82JfmY946JJ9qr7lvS1nc7LZc/VgGNSy27LRekJSxz7SHjV96 UTlqr0M1G5lIYX+GDGKjglN8DkWbUUfV4BjVyUweXGA2Stdduqlm6ZJipXnNlMyQ0af+zj8YUEkg/ 1vzu8W1MF8zZl0UVSLI/FMmp0TjRNoX4F8pTEUjSLOX/FxZigsLRwf24FJQh9X+pOjefM7kBJhwbH sqqIVuJY5gRH2tOZ6L8VsMd12htPO/tUanCgYuOCeTfD3Ra+8ZGFfgAJnC3fH/EmIbSXyiVwt8O/U G+Nnz74w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1savTH-0000000FcI1-04XO; Mon, 05 Aug 2024 11:01:47 +0000 Received: from mail-bn8nam04on2062f.outbound.protection.outlook.com ([2a01:111:f403:2408::62f] helo=NAM04-BN8-obe.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1savSj-0000000Fc8G-1sNQ; Mon, 05 Aug 2024 11:01:15 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=tvYXjX835sr1xNPG7/FwjZ9zMcEeJxxvtLq6DMVCxNTI2VQ4EkKOmwsOtVeehGXdNPUSaqJi0oJzd9blTfaAQ2ld4VjnfisBBKrbNBHDDIhZut35p02cKfj9us3JNVrvgX4K5n248JWoeToe89GOeP/TFd8TQDhBahVW06tFrpRR1X+rrny5ocOPv2slYBPBZQk8cILvcfnxem7D5r55K1QGz7qHaPueD5AhbYkFh6zcrdjJYmQ0Z73oTU+/7pJcbDSvLSBgWYfPzqpawuBu5csJqGvUrI5a3XlmHaOefOXy2qyOcE7HUyw71ubKoTgD32Nrl4xbFn65TbcxWPurTg== 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=Vbo23A1SlkC8BWYfrG46Q2gif3cx7rdi9xwlhU59K5w=; b=rNYH1FJrrbjSF+7w20nSOu8/IW/G9YBhRdrS9M9KROc1MFmxsXY3+D6D7PyllYwHTQkrwS3rZs5T4h4DvuBEHy4s1MHhK04MD7DL/aq6R1wrKMF1v9D1erktIccMuaTFcReUUSwHyFyU5wVBWQQKt0ymvW0a/bjXCGokYwEZEsvNL8kCmPzc+oFApPMlwweovmXmRQx1RvvryFvynYInyTu5LlY70EOOztbYvYTwB14/pA8wmfwndVa1PcNTWN7mpw2sj3gp9ewW+NN5Aj/pFH9V/Su66ZhnREn18FlNXiIrzwqyEQ1iRVfNg2DDH0ZdgQGKzDgK33kIGPOplSy4pg== 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=Vbo23A1SlkC8BWYfrG46Q2gif3cx7rdi9xwlhU59K5w=; b=hJgOUaJHp9M5Q+wd83TEF0eJAqvANPN7E7YPpQAffATNAwey+yAyYakmNx7nWV4zSGNUeH07EWI3ApZ9BQ9ScdjVPsWIsIHJXesJ6OcFFaO/6q8I1RsJukkYLKZY9LlFNNzlVNUWQ2T1+JFYhDSAFYlql9w0XCALTrMZsUYSRS8= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from SJ2PR12MB8109.namprd12.prod.outlook.com (2603:10b6:a03:4f5::8) by LV2PR12MB6014.namprd12.prod.outlook.com (2603:10b6:408:170::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7828.26; Mon, 5 Aug 2024 11:01:05 +0000 Received: from SJ2PR12MB8109.namprd12.prod.outlook.com ([fe80::7f35:efe7:5e82:5e30]) by SJ2PR12MB8109.namprd12.prod.outlook.com ([fe80::7f35:efe7:5e82:5e30%5]) with mapi id 15.20.7828.021; Mon, 5 Aug 2024 11:01:05 +0000 Message-ID: <1b726ef7-e25c-4a19-aaa8-77fdbdd8bcca@amd.com> Date: Mon, 5 Aug 2024 13:00:40 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v11 07/10] mtd: spi-nor: Add stacked memories support in spi-nor To: Michael Walle , "Mahapatra, Amit Kumar" , Tudor Ambarus , "broonie@kernel.org" , "pratyush@kernel.org" , "miquel.raynal@bootlin.com" , "richard@nod.at" , "vigneshr@ti.com" , "sbinding@opensource.cirrus.com" , "lee@kernel.org" , "james.schulman@cirrus.com" , "david.rhodes@cirrus.com" , "rf@opensource.cirrus.com" , "perex@perex.cz" , "tiwai@suse.com" , Neal Frager References: <20231125092137.2948-1-amit.kumar-mahapatra@amd.com> <576d56ed-d24b-40f9-9ae4-a02c50eea2ab@linaro.org> <9cdb7f8b-e64f-46f6-94cb-194a25a42ccd@linaro.org> <9fb60743-3e89-49fa-a399-3cf2607a7e41@amd.com> Content-Language: en-US From: Michal Simek Autocrypt: addr=michal.simek@amd.com; keydata= xsFNBFFuvDEBEAC9Amu3nk79+J+4xBOuM5XmDmljuukOc6mKB5bBYOa4SrWJZTjeGRf52VMc howHe8Y9nSbG92obZMqsdt+d/hmRu3fgwRYiiU97YJjUkCN5paHXyBb+3IdrLNGt8I7C9RMy svSoH4WcApYNqvB3rcMtJIna+HUhx8xOk+XCfyKJDnrSuKgx0Svj446qgM5fe7RyFOlGX/wF Ae63Hs0RkFo3I/+hLLJP6kwPnOEo3lkvzm3FMMy0D9VxT9e6Y3afe1UTQuhkg8PbABxhowzj SEnl0ICoqpBqqROV/w1fOlPrm4WSNlZJunYV4gTEustZf8j9FWncn3QzRhnQOSuzTPFbsbH5 WVxwDvgHLRTmBuMw1sqvCc7CofjsD1XM9bP3HOBwCxKaTyOxbPJh3D4AdD1u+cF/lj9Fj255 Es9aATHPvoDQmOzyyRNTQzupN8UtZ+/tB4mhgxWzorpbdItaSXWgdDPDtssJIC+d5+hskys8 B3jbv86lyM+4jh2URpnL1gqOPwnaf1zm/7sqoN3r64cml94q68jfY4lNTwjA/SnaS1DE9XXa XQlkhHgjSLyRjjsMsz+2A4otRLrBbumEUtSMlPfhTi8xUsj9ZfPIUz3fji8vmxZG/Da6jx/c a0UQdFFCL4Ay/EMSoGbQouzhC69OQLWNH3rMQbBvrRbiMJbEZwARAQABzSlNaWNoYWwgU2lt ZWsgKEFNRCkgPG1pY2hhbC5zaW1la0BhbWQuY29tPsLBlAQTAQgAPgIbAwULCQgHAgYVCgkI CwIEFgIDAQIeAQIXgBYhBGc1DJv1zO6bU2Q1ajd8fyH+PR+RBQJkK9VOBQkWf4AXAAoJEDd8 fyH+PR+ROzEP/1IFM7J4Y58SKuvdWDddIvc7JXcal5DpUtMdpuV+ZiHSOgBQRqvwH4CVBK7p ktDCWQAoWCg0KhdGyBjfyVVpm+Gw4DkZovcvMGUlvY5p5w8XxTE5Xx+cj/iDnj83+gy+0Oyz VFU9pew9rnT5YjSRFNOmL2dsorxoT1DWuasDUyitGy9iBegj7vtyAsvEObbGiFcKYSjvurkm MaJ/AwuJehZouKVfWPY/i4UNsDVbQP6iwO8jgPy3pwjt4ztZrl3qs1gV1F4Zrak1k6qoDP5h 19Q5XBVtq4VSS4uLKjofVxrw0J+sHHeTNa3Qgk9nXJEvH2s2JpX82an7U6ccJSdNLYbogQAS BW60bxq6hWEY/afbT+tepEsXepa0y04NjFccFsbECQ4DA3cdA34sFGupUy5h5la/eEf3/8Kd BYcDd+aoxWliMVmL3DudM0Fuj9Hqt7JJAaA0Kt3pwJYwzecl/noK7kFhWiKcJULXEbi3Yf/Y pwCf691kBfrbbP9uDmgm4ZbWIT5WUptt3ziYOWx9SSvaZP5MExlXF4z+/KfZAeJBpZ95Gwm+ FD8WKYjJChMtTfd1VjC4oyFLDUMTvYq77ABkPeKB/WmiAoqMbGx+xQWxW113wZikDy+6WoCS MPXfgMPWpkIUnvTIpF+m1Nyerqf71fiA1W8l0oFmtCF5oTMkzsFNBFFuvDEBEACXqiX5h4IA 03fJOwh+82aQWeHVAEDpjDzK5hSSJZDE55KP8br1FZrgrjvQ9Ma7thSu1mbr+ydeIqoO1/iM fZA+DDPpvo6kscjep11bNhVa0JpHhwnMfHNTSHDMq9OXL9ZZpku/+OXtapISzIH336p4ZUUB 5asad8Ux70g4gmI92eLWBzFFdlyR4g1Vis511Nn481lsDO9LZhKyWelbif7FKKv4p3FRPSbB vEgh71V3NDCPlJJoiHiYaS8IN3uasV/S1+cxVbwz2WcUEZCpeHcY2qsQAEqp4GM7PF2G6gtz IOBUMk7fjku1mzlx4zP7uj87LGJTOAxQUJ1HHlx3Li+xu2oF9Vv101/fsCmptAAUMo7KiJgP Lu8TsP1migoOoSbGUMR0jQpUcKF2L2jaNVS6updvNjbRmFojK2y6A/Bc6WAKhtdv8/e0/Zby iVA7/EN5phZ1GugMJxOLHJ1eqw7DQ5CHcSQ5bOx0Yjmhg4PT6pbW3mB1w+ClAnxhAbyMsfBn XxvvcjWIPnBVlB2Z0YH/gizMDdM0Sa/HIz+q7JR7XkGL4MYeAM15m6O7hkCJcoFV7LMzkNKk OiCZ3E0JYDsMXvmh3S4EVWAG+buA+9beElCmXDcXPI4PinMPqpwmLNcEhPVMQfvAYRqQp2fg 1vTEyK58Ms+0a9L1k5MvvbFg9QARAQABwsF8BBgBCAAmAhsMFiEEZzUMm/XM7ptTZDVqN3x/ If49H5EFAmQr1YsFCRZ/gFoACgkQN3x/If49H5H6BQ//TqDpfCh7Fa5v227mDISwU1VgOPFK eo/+4fF/KNtAtU/VYmBrwT/N6clBxjJYY1i60ekFfAEsCb+vAr1W9geYYpuA+lgR3/BOkHlJ eHf4Ez3D71GnqROIXsObFSFfZWGEgBtHBZ694hKwFmIVCg+lqeMV9nPQKlvfx2n+/lDkspGi epDwFUdfJLHOYxFZMQsFtKJX4fBiY85/U4X2xSp02DxQZj/N2lc9OFrKmFJHXJi9vQCkJdIj S6nuJlvWj/MZKud5QhlfZQsixT9wCeOa6Vgcd4vCzZuptx8gY9FDgb27RQxh/b1ZHalO1h3z kXyouA6Kf54Tv6ab7M/fhNqznnmSvWvQ4EWeh8gddpzHKk8ixw9INBWkGXzqSPOztlJbFiQ3 YPi6o9Pw/IxdQJ9UZ8eCjvIMpXb4q9cZpRLT/BkD4ttpNxma1CUVljkF4DuGydxbQNvJFBK8 ywyA0qgv+Mu+4r/Z2iQzoOgE1SymrNSDyC7u0RzmSnyqaQnZ3uj7OzRkq0fMmMbbrIvQYDS/ y7RkYPOpmElF2pwWI/SXKOgMUgigedGCl1QRUio7iifBmXHkRrTgNT0PWQmeGsWTmfRit2+i l2dpB2lxha72cQ6MTEmL65HaoeANhtfO1se2R9dej57g+urO9V2v/UglZG1wsyaP/vOrgs+3 3i3l5DA= In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: VI1PR09CA0174.eurprd09.prod.outlook.com (2603:10a6:800:120::28) To SJ2PR12MB8109.namprd12.prod.outlook.com (2603:10b6:a03:4f5::8) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR12MB8109:EE_|LV2PR12MB6014:EE_ X-MS-Office365-Filtering-Correlation-Id: 48e3e644-3ad2-4eb3-a8bf-08dcb53de69b 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;ARA:13230040|366016|1800799024|7416014|376014|921020; X-Microsoft-Antispam-Message-Info: =?utf-8?B?UU41Wm8ycnVKbFR6S2VpTEN2RDFGL0dQejIyY2t6dVJxeWxqRjU2YVUzcEpK?= =?utf-8?B?dmRyWVo3VmxvSUN6VTh3bWFuRUdSbStlY1c4MjYrZFFKbXZjQVUzY3huUjBm?= =?utf-8?B?S2UwNzE5bnM3aVZMVkhPeUpjS29wT1ZVVXY4WE1yU1ZhNXQ0czdXSThBL0la?= =?utf-8?B?NmRhRUx3N0d6YVpwcGI2czRiQkN6MjA5SmR0UExudDlwYm1NQURoZTBKNUlr?= =?utf-8?B?ck8wNkZKcDJadEtEdVZ4b3k2bjB4ZWNpVHdSNThtcU9rYzBEZ0pRQWI2a2Zo?= =?utf-8?B?NzhEMS9XTXpaVlBmK3B6cGxISk45eFZ4amNJN0FPZXJRUHR1cHo3UGtOVTkx?= =?utf-8?B?R3dnQTVrV1M2emdwOWw3NjFUSGt3N0hEdndEM1ArR29aQ3Byc3A3Znpmd1JL?= =?utf-8?B?d094VitBZHVBVk94d3J4QWkvZGVzZEhuMG04MTBaNEVtZHN1SHlsVGZmbGJP?= =?utf-8?B?bUFsM0NnaUw5QUk0TXdrK0VoWDcrNEdvV2JUNmRoT2pQWmQyK2U2SkRqNGtx?= =?utf-8?B?S24wZXhqUjFwZTJvd0tuaEdvL2JSR3QvSTlvRjc5bG1tSUhkYVU4YUtvZ0Zl?= =?utf-8?B?am1KYUlhdGgvWEMyWXFpZ1o2NjNLZGZKcy9EQ0JhWC9USlNzcHh6TGorT2Zy?= =?utf-8?B?UmRKc2k5MXZ1WTc1bHFoY3lFdU51ck1aOEY2ZmJ3RThUVE4rUVlrWWJESTRa?= =?utf-8?B?aDlZNTU5MXZmci8ydXgwNkR1aWN0alFmbEc2UU5KdFR6aUlCM3JqczZ1Lzkv?= =?utf-8?B?ZVpLbGtKMGkrSzVJOWR0VHJlWnJaOW95YXhPYlVWOWpPcm9ueXBDSU1SVnU0?= =?utf-8?B?UUtQQU1uQU9yQjFTN21UUWhKTUFHUzhsYy8xOGJVWk9TUE1KMXorcThBWCtq?= =?utf-8?B?Y21ZRUtHYmRIcndzdW1YNVIyWHJGY1Bud1pEeStibkRZUUVyM1ZOYXFIZmxZ?= =?utf-8?B?cnZVUFRINTZnYnFYMnpBMnpmMmdUTGlSNlcwWWNkUjBRbkNtaksxZnpCNVU1?= =?utf-8?B?V2NsS1RxN2ZxZWNoNzJGeUFOWG8zc0lGY01oY3dKc01NcHQ2OEUzZk1DaWIy?= =?utf-8?B?VlBJL3RJMVZXSCtwaDJqZHRNTWE2L1IvRDhKdXAzU3p1cktJQXhxeDFnQU51?= =?utf-8?B?bVJsOXVsZ3dpbHQ3ckFtUlAzN1huRHByd2hKbGRiUS83NnIyUXVRcFB3TXZZ?= =?utf-8?B?cXg5QTIxRU5YY3dLWWlneUZWZk1QWUdDbXN3UjNqeFcwTk9xVnl0VHpSN2dL?= =?utf-8?B?WktTWU13b3NiYjcxRG04emFzS0RyRXY2UGRtOGVjVzZvZURXVmhDYy93QnA0?= =?utf-8?B?YzVyMmFqR2hyUTk3MlpaM3NvK2EyRSs0MEN6bi9UTU03K2xZYTZuOGtKdlVV?= =?utf-8?B?QkZsMnJpbUkvcVQ0RWJCL0pNTlJBSWJ0NFM1Y21jRHM2UEErOW1WeFhBMXUw?= =?utf-8?B?TElpNXNOMkZHTDlHVUZFanRyMlVvM25KOXByQ3ZWbkJpc1RTaVJ3NmtYVnRZ?= =?utf-8?B?R0xCRk8vKzFMUGh2NXArazVtZ0k4bGhYYVBmRzF1ang2dlMvVHhsTTd1eU8r?= =?utf-8?B?WEt0ZGZ3NHBSbG1OVC9oK3RHNmt5WE1NcWZZV1hibDQ4RHNlOHdYbzMzZ3lM?= =?utf-8?B?QW91MzZ0dFpua092L0luNFU2R1cxT2ZDNUt2UTl6NURCRG91eVBRYUJheVRC?= =?utf-8?B?UFdGN0JNalRRcjVoRUZPR0Z3K0dpL1oyenF6OXJMdkNnRFEvbnkwa2tSc0xy?= =?utf-8?B?SHRPcEtORVYyN1VIQ0RTdHFHT08zRTR1WTcrbjFraUpSUkFKT3pubUp6THM2?= =?utf-8?B?OFJpSTJja1hRUmZOQkVNclV0T25KNFVTSEdhcVJJemZiU2hrV1QrMXFrR1E0?= =?utf-8?Q?40asSLL0YzlRQ?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SJ2PR12MB8109.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(1800799024)(7416014)(376014)(921020);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?TFk3M2E0Z2plc2ZiOHB2WXY3M2kzUS9qOHJFTkdUTjF2K3FxVUV2b2JVMUZF?= =?utf-8?B?WHo2MUdnSGlrSi8zMU9FOVYvai9ycjBhWkJwY1ZzZWtxWUxWcHFESlNtMnhw?= =?utf-8?B?am5icEwzQkMyaEt1WTJ0bGIzdC9CVC9mTXJyYm5Sd1pSbGxseVBLbkRhWEZx?= =?utf-8?B?akRtZVloeGJqcjFRSGQ5Qk9wNHBkNW95dmJZUk45Q0VZU3lUYmpBUmxZYS90?= =?utf-8?B?OThveWxWRkVFWkNnZEkyMDN4ZE5NRENYbmZSSnF5MFU0VzNKbHhKSlJlSDU2?= =?utf-8?B?bnBjMlZHTUNUcFczN0RkSHNWeGhKQ0pkTXJEZmtsdVMrekY3UEdETSs5dlhp?= =?utf-8?B?NEVCZVpXQVhLTjhnSmNnRVcvVFR6d1FxdHU5Z2IvZndObWxVaysvWHFzZTRM?= =?utf-8?B?cE5JRU4xVytMYnVTQlFwTUIyLzFUOFliTkNnMjNwQUpLWlZaRWU2Q29YWTY4?= =?utf-8?B?ZEE1bTJxVGd6c2FpbDBGaFgydzBXVGVtVHh0dlQ2bjkxOFJpRGxhM095QWcz?= =?utf-8?B?dTlac1BrMG55VzhNdXhDaEY5OTNvM1RmNmJsUXlZMmZ6cUlnZkJ0RVdtb055?= =?utf-8?B?bmVlamtWdkNZS0VEM0lNVWUrM3p5N1RaMGdIS2pTZTN2ZHo4S01EaGN1cmN2?= =?utf-8?B?cFpqaTkzMlVZd3NibDV2S0JkQ2YyQ3BBdk9MNFBLanNzNGtCcGEzREhSMkNC?= =?utf-8?B?U0RvMGNHSHFQY2RuNVFMbWJ3c1JhL3RURDZnZEJKaGxYdUtRWTBrUlpwUXhh?= =?utf-8?B?V25DOEh2SVk4YjhJQmhxS1ZVT3N1dHVTazkxRmdaMzFMMmFhb1hoa3daREM0?= =?utf-8?B?Q2NnUTlzMUM3K0M3ZDRaVnhxdmVUYkMwdjJWdWVVUVBRQ1pMVURZL1pMRWJk?= =?utf-8?B?dzU0d1E5L09MTTM4M0pNTkxwOU9sOW83RFNnbDRVU1dMTGNHZmRVRjBkcUZK?= =?utf-8?B?SG42bEwvUWxwQisvdzQ5VUZpTGI3cHBvaVhKdFlzZy92N1YzeklsN09sRlJO?= =?utf-8?B?UmZ6L2c4b2NvMmtZbnB2YS9oWWd0T2RXSG9PVXpiRUMxSlhiaFdPMitaZnI4?= =?utf-8?B?aXRHM2ZqekhNUFlCRjJ2QVBzaHU5OEZ0L3BLQkcrN1hEM3dXMzY2MEFtNnVJ?= =?utf-8?B?dU9PbEl5NkJXT045aDY0cTY5cUNIMHRUaGJFRFZpY3hhUEs1Si8wSkxUTGlw?= =?utf-8?B?RExuamQ3Q3lrT01na3NKTHh3R3Q2RGpBdDVHVXcrUG4zUzhMKzJwZk1JYWV5?= =?utf-8?B?S0xyWDdTTk9tczQ2eDBYc2dzbFlSemZqdVhjODFSVWMyM09QUXNETzVvMi8x?= =?utf-8?B?RThHbkZWWTB0VlRVS3FQOUJFWEd1anhGazVCQmU2ejF5ZExtVjI4VE5XM2FT?= =?utf-8?B?S3IyUTRoR2MzYTZuK0RnNDlrWlQ4aW93TXNmbUcyM0hqOW1VTVBWK0o3UDZr?= =?utf-8?B?OEJ5bUxPZzN3UzVzRUZid2lLSnVNRDA3QmZrZzZuR3FPY2RhYjdIWmZpd3VK?= =?utf-8?B?MlEyNmVrNGZDSnNUbkhIbzd5QTJYbENHQ1V0RzJncWNkUk83YW1pR1cyMWRC?= =?utf-8?B?S2o1akVweGl1QktDaTA2MlZxMFFZL2RtNUxEYmsvaU1xU05OWUI0dlpYTXhI?= =?utf-8?B?OG5obmZUMkpvaGd1WndDVjdMOGlTRlJrTGhCalV6dlQ5V041ekFKYmErTjRM?= =?utf-8?B?NktwWGZWY1hvdk9rTjZGMDVseEFHM1hnRW92OVJLRGIxVUxKdytxaWkyMGJO?= =?utf-8?B?bkd6Rkg3NnlKOTBlUFVtV1pDUVdYTlJSZ1I3VzdlUE5KTG0xMjFtbTZMdEVI?= =?utf-8?B?a2haSXUrOUIvelM1aHhnb3dpYTZ1M0ZiNU02Y2c3OWVEaGZ4U01INWtVZnpx?= =?utf-8?B?L2ZmUXJTVE03R2FZcVVvQkxoQ3EzVjlNcVZDTGhGWVJlVzI4RnRmSjBoZlFK?= =?utf-8?B?ZTdNb2VyWS8zbTJucFEwdUovK2dDSktnQjVLWi82UmZGZnhVR09QclJxK3VF?= =?utf-8?B?ckpheTZ3ZjVwTWg4ZFg1eGFOVXhwRWxVVXFIaUNRQ1VWaDQwdUJvRFdwQ3BM?= =?utf-8?B?UXF4L1lYYzFVVVZ1NGZLWkVRR2NlNDhMQmxjVXd5MlRUaGZMQWZaMENwWXpR?= =?utf-8?Q?fUskuUII2QUbdmUFf9rODKFsS?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 48e3e644-3ad2-4eb3-a8bf-08dcb53de69b X-MS-Exchange-CrossTenant-AuthSource: SJ2PR12MB8109.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Aug 2024 11:01:05.0677 (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: Lx89rO16LqFzFQTu709ksPAEzwWwmvAZu0VEgpe0MfEi533rtHgMjI3aE/zO9baO X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV2PR12MB6014 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240805_040113_631640_6014D35D X-CRM114-Status: UNSURE ( 6.06 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "git \(AMD-Xilinx\)" , "alexandre.belloni@bootlin.com" , "alsa-devel@alsa-project.org" , "linux-kernel@vger.kernel.org" , "amitrkcian2002@gmail.com" , "claudiu.beznea@tuxon.dev" , "linux-sound@vger.kernel.org" , Conor Dooley , "linux-mtd@lists.infradead.org" , "patches@opensource.cirrus.com" , "linux-spi@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "beanhuo@micron.com" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, On 8/5/24 10:27, Michael Walle wrote: > Hi, > >>>>> All I'm saying is that you shouldn't put burden on us (the SPI NOR >>>>> maintainers) for what seems to me at least as a niche. Thus I was >>>>> asking for performance numbers and users. Convince me that I'm >>>>> wrong and that is worth our time. >>>> >>>> No. It is not really just feature of our evaluation boards. Customers are using >>>> it. I was talking to one guy from field and he confirms me that these >>>> configurations are used by his multiple customers in real products. >>> >>> Which begs the question, do we really have to support every feature >>> in the core (I'd like to hear Tudors and Pratyush opinion here). >>> Honestly, this just looks like a concatenation of two QSPI >>> controllers. >> >> Based on my understanding for stacked yes. For parallel no. > > See below. > >>> Why didn't you just use a normal octal controller which >>> is a protocol also backed by the JEDEC standard. >> >> On newer SOC octal IP core is used. >> Amit please comment. >> >>> Is it any faster? >> >> Amit: please provide numbers. >> >>> Do you get more capacity? Does anyone really use large SPI-NOR >>> flashes? If so, why? >> >> You get twice more capacity based on that configuration. I can't answer the >> second question because not working with field. But both of that configurations >> are used by customers. Adding Neal if he wants to add something more to it. >> >>> I mean you've put that controller on your SoC, >>> you must have some convincing arguments why a customer should use >>> it. >> >> I expect recommendation is to use single configuration but if you need bigger >> space for your application the only way to extend it is to use stacked >> configuration with two the same flashes next to each other. >> If you want to have bigger size and also be faster answer is parallel >> configuration. > > But who is using expensive NOR flash for bulk storage anyway? I expect you understand that even if I know companies which does it I am not allow to share their names. But customers don't need to have other free pins to connect for example emmc. That's why adding one more "expensive flash" can be for them only one option. Also I bet that price for one more qspi flash is nothing compare to chip itself and other related expenses for low volume production. > You're > only mentioning parallel mode. Also the performance numbers were > just about the parallel mode. What about stacked mode? Because > there's a chance that parallel mode works without modification of > the core (?). I will let Amit to comment it. > >>>>> The first round of patches were really invasive regarding the core >>>>> code. So if there is a clean layering approach which can be enabled >>>>> as a module and you are maintaining it I'm fine with that (even if >>>>> the core code needs some changes then like hooks or so, not sure). >>>> >>>> That discussion started with Miquel some years ago when he was trying to to >>>> solve description in DT which is merged for a while in the kernel. >>> >>> What's your point here? From what I can tell the DT binding is wrong >>> and needs to be reworked anyway. >> >> I am just saying that this is not any adhoc new feature but configuration which >> has been already discussed and some steps made. If DT binding is wrong it can be >> deprecated and use new one but for that it has be clear which way to go. > > Well, AMD could have side stepped all this if they had just > integrated a normal OSPI flash controller, which would have the same > requirements regarding the pins (if not even less) and it would have > been *easy* to integrate it into the already available ecosystem. > That was what my initial question was about. Why did you choose two > QSPI ports instead of one OSPI port. Keep in your mind that ZynqMP is 9years old SoC. Zynq 12+ years with a lot of internal development happening before. Not sure if ospi even exists at that time. Also if any IP was available for the price which they were targeting. I don't think make sense to discuss OSPI in this context because that's not in these SoCs. I have never worked with spi that's why don't know historical context to provide more details. Thanks, Michal