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 phobos.denx.de (phobos.denx.de [85.214.62.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DDDD7D44C60 for ; Thu, 15 Jan 2026 14:57:44 +0000 (UTC) Received: from h2850616.stratoserver.net (localhost [IPv6:::1]) by phobos.denx.de (Postfix) with ESMTP id 2F93982BF2; Thu, 15 Jan 2026 15:57:43 +0100 (CET) Authentication-Results: phobos.denx.de; dmarc=pass (p=quarantine dis=none) header.from=cherry.de Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de Authentication-Results: phobos.denx.de; dkim=pass (1024-bit key; unprotected) header.d=cherry.de header.i=@cherry.de header.b="ZvKaEH1o"; dkim-atps=neutral Received: by phobos.denx.de (Postfix, from userid 109) id 0296B83015; Thu, 15 Jan 2026 15:57:42 +0100 (CET) Received: from DU2PR03CU002.outbound.protection.outlook.com (mail-northeuropeazlp170110003.outbound.protection.outlook.com [IPv6:2a01:111:f403:c200::3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by phobos.denx.de (Postfix) with ESMTPS id 05ED680077 for ; Thu, 15 Jan 2026 15:57:40 +0100 (CET) Authentication-Results: phobos.denx.de; dmarc=pass (p=quarantine dis=none) header.from=cherry.de Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=quentin.schulz@cherry.de ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=HPIWNvSsdAQkuEQHYec5o9rEmTAzqu58X5w/6Pn82gDbE15Uivtq8nGnjaErsw75AjeQ6tOP1uyWX1kce0/hu3XZGpQImSLhyaN/a0QkJ7ymbwKN8bBhfBHUsASy2mLCVyAYRJ7KPgw9hbG7LcgNIEFtg2Z5Z16nhBuuBMlm9kcjsFqe7638dgv5odZgphpaLNQR0i65sUisuxdkJni92oqqwR9DvvsPoRhw7YTQvKvW/6sXPNYfacqPCo540cQWamH7kJlbGMiewjp9ZKQNjwhYqkbevK2GYQeABrHqSqNpMJUMmYJZ9wcY26t+XaQR+Ah8SlQMt9pVTpQgOetDwg== 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=TP+qb1kW9vGP+KVwXAFtOdSQMOeII+21V2yeDFzWCrA=; b=gRAxHWVevTXarSDkFU7cdRg4zQbTyCcUDC16VauEVlDOa3QMkNv4zMrR6CHsRrK1lb1orTzTbc4K0crzKEOX4N3yN9LqM8mRzCN7+fNZ4I0x9PWlIYlLHO5BS/KNqS49JgCSfu6RcuL5WHWkRpGzzdZwjivCAVsLIBX0OS05ElveK0dXnhiriDdARkCLl6E3xhyLrQAHGUNDBJFSE1CS442KopipLxFVEvYEVoTqR449T/xeI9HGy8UKW6eatZCXifmbalSOVI0xIQYaqxFIialTj/00CX5VDUCzcSIdKPnyWMzw0VuWglZVCRKYlIeeUs3smxZkFLk3SvRUdaQhhg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=cherry.de; dmarc=pass action=none header.from=cherry.de; dkim=pass header.d=cherry.de; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cherry.de; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=TP+qb1kW9vGP+KVwXAFtOdSQMOeII+21V2yeDFzWCrA=; b=ZvKaEH1obSIkVnez9t/LuyrpbZBke7DGFa8UDNsmyFLuJeDPr/fYVX8F/lYaBvJ+bhvoLwfz5hEKlnGcMzFMS0OroKyujPrfmAukhs+80XsolSJYFjRStwQE+Ld9uVM8zW/B02EzK1QLdZvI79rkVoNxAMQFvZ2yuHUDuuSLW34= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=cherry.de; Received: from GVXPR04MB12038.eurprd04.prod.outlook.com (2603:10a6:150:2be::5) by DB8PR04MB7098.eurprd04.prod.outlook.com (2603:10a6:10:fd::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9520.6; Thu, 15 Jan 2026 14:57:38 +0000 Received: from GVXPR04MB12038.eurprd04.prod.outlook.com ([fe80::6c04:8947:f2f0:5e78]) by GVXPR04MB12038.eurprd04.prod.outlook.com ([fe80::6c04:8947:f2f0:5e78%6]) with mapi id 15.20.9520.005; Thu, 15 Jan 2026 14:57:38 +0000 Message-ID: <973ffe5e-e962-493e-8a22-6ef09a1475f4@cherry.de> Date: Thu, 15 Jan 2026 15:57:36 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] board: rockchip: Add FriendlyElec NanoPi Zero2 To: Jonas Karlman Cc: Kever Yang , Simon Glass , Philipp Tomsich , Tom Rini , Yao Zi , u-boot@lists.denx.de References: <20260110205337.1242457-1-jonas@kwiboo.se> <7d77e501-2347-4f1e-af36-c82a47dbf126@kwiboo.se> Content-Language: en-US From: Quentin Schulz In-Reply-To: <7d77e501-2347-4f1e-af36-c82a47dbf126@kwiboo.se> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: FR3P281CA0190.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:a4::8) To GVXPR04MB12038.eurprd04.prod.outlook.com (2603:10a6:150:2be::5) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: GVXPR04MB12038:EE_|DB8PR04MB7098:EE_ X-MS-Office365-Filtering-Correlation-Id: b582234f-d388-4104-3631-08de54466c94 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024|7053199007; X-Microsoft-Antispam-Message-Info: =?utf-8?B?STFFVXhoMDBadG9CY0twYXIvNjNsTE1Ec1YvbDdkZXc5YWhxN0tnYXovQlFo?= =?utf-8?B?L1VPRDVmek5VQjY0VThvTDV6em10VUhjYUhqMXZLSXo5VWpKMFkzb2xYU3or?= =?utf-8?B?cHpISVp2Wm5RQklOZW1sOCtNOVRhbkpFNHZhMVV3SWJkb0ZKcEQ0WE5rRyty?= =?utf-8?B?UGo4bmxVMEFiOWpSWjlVQkRRS1NQSzNNWFJYYi9EUm5MYlEzMUZDMDI1cWJ5?= =?utf-8?B?a2h3dzNMU1BHWVV3eTJmbjBheUlWYXlwb2NjQ2JlN05CWXI0RWQ4RnJ0UU5Q?= =?utf-8?B?ZnFBWGJ1L25rT3FJeU5CYlQ0N09BN1p4T3oyLzdaOTQ4UTVkSGJWUzNQNE1k?= =?utf-8?B?a3BCV2hyRloxN0RONkxSbGduTXBrQWM0Vy9aZ04yRm93OW1Ndnprc0h4Ympl?= =?utf-8?B?WGNGZWNKMVdrZE9IK2srRmRxd0JGV3ZMMFIzY0gwMGJERExSZjFLOWZ3U1JI?= =?utf-8?B?L29NVzBscnFTNWpHNU9JeU12VWRlK1ZVWEJPNHVxbUV0WXFRSU1lTXR3TGJt?= =?utf-8?B?bHJzK2o4Yi85Rzk4UmxpYVUzRG1UVTNkT2tkRGJoeSt5dGVnVndrNE1TblFn?= =?utf-8?B?UlJqdW9TN2s2QVlwVXRzQTdoeDJZVlgrVzhIVVFWRXlucmY4U2JmSnZRS0k4?= =?utf-8?B?cFJZdW9kWUVXdTRRdEpQcDFnb2ZiV0N0M1dhWnNYTzdMeXRWbEdoQ3hmVDAx?= =?utf-8?B?Y25RUlhUSnczUm1xTm45R3g3MXNzQlhWSjFwSC9OdDFSVUFWaUQyeWEvY0F2?= =?utf-8?B?bzNhSjJ0NlBhYzd1OGNKRVZCcWVVU2hyTDJNVFJoZ0Y5bDkvUmtaZEY3K01w?= =?utf-8?B?bjZQWW9lWU8vcHhmRE9ZT1hjZFBvbytuN01pMVhYN09TekErYVEvRWsrOWY1?= =?utf-8?B?Q09Bbit4VVZGc1VHVDFPbERabkYrUmNSWVMvUnRiM2creTF3QnhjSzlKQzNU?= =?utf-8?B?V0NUZUUwUFdzQjlHcW1wQXhiZDNHMnYvSkg1SFVyVG42QjY3Yy80bURGcndl?= =?utf-8?B?SDVVYjVHdWR0VWhUbGpIcHRVaUljSElqNFM0akRramxrV2FDSTZvN21pSTZH?= =?utf-8?B?bXVJTUdTeUoyS0ZVazliNTFQSkZ6cStMOXYxNGEwMFAyMnBWVmtwYVk3VVFR?= =?utf-8?B?aUYrZVByR1UzVE9jTkN3UWNqVHhwUnkvU2lMU0xSOFg5SEcvQ3lmRjA0Rk95?= =?utf-8?B?M3Z2bzNucjBpV3ZyTnA4bzBGZ3ZCUmJCRFk1eEZmaFBBMVFDMVgxYTkrN2xq?= =?utf-8?B?NzQzRXE0U0hDU3p3QndUNkNhdkNhekV6K1BRczRnZlpjOTV0WmZ2eHlPeFpL?= =?utf-8?B?ZExWRDZsRUhuaDduNVpHczhaQVNZQjcrS1l1SU1PVFU1R2w1ZHNNa2tISWZ5?= =?utf-8?B?YitsM21QRzRPSFc0c2pxZGNMSzRMZXNnOXA2MmxleGdFSW5KTUtHVnR2Y3lH?= =?utf-8?B?WTJVTE5JMG51K3YybEM2Z0RhQmE0K3IxK2xMb2U0aVBkMXorNFZLdmNwSWVp?= =?utf-8?B?bFB2dEFwZGI4VmI5UzFEbldIOWx0c2JZS0F2cXB0bytBcVZ0V256TTgwY29s?= =?utf-8?B?WXlvbmk0ZFJ4aTRnOHN6bVlzRnMvdHJrYkVIZWJHU0pFeW9lRi8rUmwyY0xN?= =?utf-8?B?VVBSSE4zZHdSZXhOQVFuZUJmTnNXWE1aNGE3Y3dTVHk3R3YrQzU4eUVlMVFw?= =?utf-8?B?S2JQbERGYm04OWZsL3Q3akh6T0J5WFdLK0w3VkprQmZuNkpZMXhJdWw3NUdr?= =?utf-8?B?eVJwaW5pcklrZDJRZW5xUkFWYzlBQjZjQ0Y5Q041ZmUrMGpWd2dITmJvQjVL?= =?utf-8?B?UElxbUI0VmtTb2dYaTQ5SjVwOXhjempmS0tQWjQ5dUdRRWhockNKT1k0Y1c3?= =?utf-8?B?Ynd3ZkI0QXJTV3hpSmpyQVQ3QlVqN1NFQ2JKbkt4c3hsWFo1MnhBVVkrNm4y?= =?utf-8?B?L3dOU1U2aDNra3V0T05lUGkzQUpwZUpMam1MeStxRW1aYzFLWGkvV1Jqblps?= =?utf-8?B?OVpSY1BkMFc0Y0pwbWdhUFVRS3R1U0VyS2dCd3ZTMUxLYjBDWmdXRGlxbzRI?= =?utf-8?B?N0VDc2grc0ppSmlWaGRMZ04vZUwreVlwQnpZbjJiWFFQZ1FzaWVNUFZXOEhl?= =?utf-8?Q?78Cc=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:GVXPR04MB12038.eurprd04.prod.outlook.com; PTR:; CAT:NONE; SFS:(13230040)(376014)(366016)(1800799024)(7053199007); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?R2xRVllWcW5sVkN6b3Nud21KdUFKcXMxVGozK3h6QmphRG5DVlJGWk9wWnln?= =?utf-8?B?S01lZERvZXVIRDU0czNyM1BIbUZ6UzN2SUh2R0xvUHBqbWwwOUoycGEySFNB?= =?utf-8?B?UTlPZXdKMkE1S0JnMEJTbVh0aFVLZGNPblEyOHdyeCtNMFF3cmlhTVJ6Rmdr?= =?utf-8?B?NDBRdDBZOW5YL1o3WmFGQTlRbXFDK28vV2NvQ2oxSW10K0dSM0EweDBNZk9a?= =?utf-8?B?WDR2WUJGMkt1Vjl4cGx4dEZDNlhXMURKb0pEOUxBZjJhVlZHdmtGeVBtQjNB?= =?utf-8?B?SVRGWXNIZHhVSUhBWi9xY3pNRDRTV0xuVFVCMzViUHJOVHdRaEFhbHVTYk9F?= =?utf-8?B?MWxKWHdEbTU0OWNvdGN2WWJhYVVPaUNHSnQyejJWNnFYSjY2bTVGeklmV3VQ?= =?utf-8?B?YmZseXQ3RUNIYko2aUx2ZXNEUTNnZ3F5ZEpHTWN2c3lRME04VWJSNDBwQm9E?= =?utf-8?B?V3VFQ3NGS2ltZGVTakFCSCtQWkkvNzdVNnE2OW5acU5scjJJRFo4UWZMUC9p?= =?utf-8?B?YXVTWU5qUy9LUy94UkgrUjdocUFuc2MzMkNwUGdVZjVGTlhUcU5vQW1WNktO?= =?utf-8?B?am5Vc3ZHc1BoN2tOc3RzMFQ0aWpvdHpKMmtqWW91YjU3NmVURmFUWEp0aXhT?= =?utf-8?B?WDM2YzRJem9Pekd0Rk40MWYxVDVaaDk1TmhRZy9yL3hVN3dRYVplUzZYa2cv?= =?utf-8?B?RXl3YnlMdUNITXlmYTNab0NSR24vYWhYSExzNzVzeXhOMW5kSk5vZXFMTXdT?= =?utf-8?B?T0ZyUWFhV2d0cVBYNTBxYzNkUFhWcWVYazcxc3A3d0h2a1hlQ3lSTURJMW54?= =?utf-8?B?S3I2NkNreTM2WmVuTW1xdWpQNm50N1ZxYUluWS9ucVRmbjN3TVZNZEwwUkR5?= =?utf-8?B?VERKM3pPZWNIenFEQWJYelh3ZXZYNjdWQnY1SlZnOGtyd3lQM2FVQnRZUG83?= =?utf-8?B?cWRNTlgvVUdYZWRlLzFHTDM3NlhFbmVIVmgxTWdRUktDejc2b2J2WDRRYzkw?= =?utf-8?B?amhFOGRhZi9xcVAvbUlXTU5lTnVmWjBxYzVkWjhXVGpaYkhsZ204aGxwa0Ju?= =?utf-8?B?a0cwY3ZyZFVrNGFiWGt1MG1jNXJSWS9mSHBEeGZ0OFdLNGIxZGk2a2syN2JL?= =?utf-8?B?VVE1L0R0YUFQSStuTWovaXpQdGUraGFjWGJsMDVqYjMxdFVnYnpBU0I5dUJ5?= =?utf-8?B?enlEYVgvNDJsaGJUcFdyaDBSRWxkcnNzZlFTUzY2MEZxQWtvb2lsVHBqcWNZ?= =?utf-8?B?amlPZXpRTVdxQTNicHdvVTMwWHFuaXllNnNDTlJrMmFaWC9GRTAxckdvclFU?= =?utf-8?B?ZEZyeDRMVnhCQzBCL2RDL1JyQjdFVTNXS0hUWUoyTUxHNnJNU08wdjdPQTAy?= =?utf-8?B?MkpNeWdNamgzM0J3R2I2bW9XaHZkemhOZCs1RWZJTEtXMEtDVnVBb3JYZkxQ?= =?utf-8?B?Ny9adHFBWDVGLzBBY1pENjBEU1N2K3RjbDZ4MFRWZ2hSK3hKRWV5bk1wKzJW?= =?utf-8?B?ZnE1V1d4V2NZSDJoRHVGbVc4SWxEdWYxbjVOVS9KMWtWNHZxTThoa2x3VVN3?= =?utf-8?B?MGZtckw2VS9id1JYVlhSU0JqbTZ6ZlVSbGEwMXdKeXcyWUtRNGZ4OEttZzRk?= =?utf-8?B?OWRjU2J4em9reHV4MHpTNDkwWkhSc3U5YmMvMTFoSWIzV2Y0cXpHR1VhdkYy?= =?utf-8?B?RFFIamY4V2trS1pwODVmSUVseFk2eFNiYVdJb1hGMzkvVVpaYS92K0d2d09z?= =?utf-8?B?MWdEWWJwT3NHMy9jTzlXWUlGY052Z3lOMFpJcFlFT2d6SVkzK3lhL2xRcmRO?= =?utf-8?B?VVJnbThBTGV0anFhT2VTYUlncnk3MC9vR2FTQXRlaFVJTlY5djdpSTdwUjFm?= =?utf-8?B?L2RBL1JwK1BIbTM5NlltVnZ1NEZzRW81K1NSb05nYlpJTXRYVTladE1PK3F1?= =?utf-8?B?MG1rSU5XODJQNjExNXNPMlZQM05uV2dHZzg3VWQxQkJ0VDdrVjgrNXVrdG5V?= =?utf-8?B?Q25PemNKY3dmMkhna3NvTktxektnTVBmWStPWEN5bklQemJxZ3p1M0J3dWdq?= =?utf-8?B?UHRZc3FOYUdDT2U1TFZQVFpoWmNzMUUybmlRcWZJZk9HQzlDSzNidFEwNFBY?= =?utf-8?B?YWI4WTVyNG04Q1hYRlJRN09QWmo5MHpORFpxbTlETkhsZGZhZHZGTnV0MDc1?= =?utf-8?B?MndHK3NKZFFqV2R1S1lRU0srU1hZQXlXYUVuRGNtdExwbjJxemdxZXRsM0tu?= =?utf-8?B?Nzcwanl6TWJ0cW5ITzhXYnVhVkJ0NnZtZ1lLVUd6N1VXZnBlYVhrd0d3RCtP?= =?utf-8?B?aUpSZWdnOC9jYU44WkNuWXJ6ZEo3UHZFMkhod0JDZ2ZyeTZNQ3c2UT09?= X-OriginatorOrg: cherry.de X-MS-Exchange-CrossTenant-Network-Message-Id: b582234f-d388-4104-3631-08de54466c94 X-MS-Exchange-CrossTenant-AuthSource: GVXPR04MB12038.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Jan 2026 14:57:38.0181 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 5e0e1b52-21b5-4e7b-83bb-514ec460677e X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: VNTS5l4yJfN/lYCP9/mhqNEliPul0/TrxlIfiB6D1gN1UhVz4h3j4/QVEhewJ592qNL4fna/sqBWgaOOXlN2+PoKB8TssjsE/T6ndIp6gnY= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB8PR04MB7098 X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.39 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.8 at phobos.denx.de X-Virus-Status: Clean Hi Jonas, On 1/15/26 2:35 PM, Jonas Karlman wrote: > Hi Quentin, > > On 1/15/2026 1:24 PM, Quentin Schulz wrote: >> Hi Jonas, >> >> On 1/10/26 9:53 PM, Jonas Karlman wrote: >>> The NanoPi Zero2 is a small single board computer developed by >>> FriendlyElec, based on the Rockchip RK3528A SoC. >>> >>> Add support for the FriendlyElec NanoPi Zero2 board. >>> >>> Features tested on a FriendlyElec NanoPi Zero2 2407: >>> - SD-card boot >>> - eMMC boot >>> - Ethernet >>> - USB host >>> >>> Signed-off-by: Jonas Karlman >>> --- >>> arch/arm/dts/rk3528-nanopi-zero2-u-boot.dtsi | 11 ++++ >>> arch/arm/mach-rockchip/rk3528/MAINTAINERS | 6 ++ >>> configs/nanopi-zero2-rk3528_defconfig | 64 ++++++++++++++++++++ >>> doc/board/rockchip/rockchip.rst | 1 + >>> 4 files changed, 82 insertions(+) >>> create mode 100644 arch/arm/dts/rk3528-nanopi-zero2-u-boot.dtsi >>> create mode 100644 configs/nanopi-zero2-rk3528_defconfig >>> >>> diff --git a/arch/arm/dts/rk3528-nanopi-zero2-u-boot.dtsi b/arch/arm/dts/rk3528-nanopi-zero2-u-boot.dtsi >>> new file mode 100644 >>> index 000000000000..3e2fbd81da17 >>> --- /dev/null >>> +++ b/arch/arm/dts/rk3528-nanopi-zero2-u-boot.dtsi >>> @@ -0,0 +1,11 @@ >>> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT) >>> + >>> +#include "rk3528-u-boot.dtsi" >>> + >>> +&vdd_arm { >>> + regulator-init-microvolt = <953000>; >>> +}; >>> + >>> +&vdd_logic { >>> + regulator-init-microvolt = <900000>; >>> +}; >> >> Why? We need an explanation here to know if and when we can get rid of >> those additions. Why aren't those in the Linux kernel tree? > > All prior regulator-init-microvolt props was purged from Linux DTs some > time ago [1], instead of adding a dt-binding for this prop :/ > > After that change we now need to keep track of any initial microvolt > that should be set by U-Boot in -u-boot.dtsi files. > > If I remember correctly these regulators may have been initialized with > too low or high voltage out of reset, and this ensure stable operation. > That seems odd to me. Why could it reach U-Boot (where the regulator driver would then enable the regulator at voltage init-microvolt) if the regulator was initialized too low/high out of reset? Especially for vdd_arm, the CPU supply. I'm not sure we'll be able to convince the DT binding people to add this property though, it all seems like a problem related to devfreq not being handled in U-Boot that could be resolved by configuring the clock-tree + regulator-tree properly appropriately I guess (which is easier said than done :) ). We already have plenty of boards with that property (including some I maintain... news to me :) ), one more won't hurt us, so Reviewed-by: Quentin Schulz Thanks, Quentin