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 8EACAEB64DD for ; Tue, 11 Jul 2023 19:47:28 +0000 (UTC) Received: from h2850616.stratoserver.net (localhost [IPv6:::1]) by phobos.denx.de (Postfix) with ESMTP id 692BA86926; Tue, 11 Jul 2023 21:43:48 +0200 (CEST) Authentication-Results: phobos.denx.de; dmarc=pass (p=none dis=none) header.from=denx.de Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=denx.de; s=phobos-20191101; t=1689104628; bh=RflVlqEctOYc/SXUhXwxUFF1PiD6th1rYkWn/NPoXkQ=; h=From:To:Subject:In-reply-to:Date:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From; b=fSr4YKf0SqjXqwvugH55me007NDcv3U3M6fVS6Ws7t/O/cHfSlc9uDHSW2mtQrguP mTCm65avAEWpPFYFx8U+AcHUCIVscP8uSNdPMSzIeVAGzp97zXoBzZfMf1gr0Mao4n Y9JUIomLli5xcrtt/H6tn8o3CMqDCU+wzcpBrOKFhMBiIVO9uwCfaBiN5hxnrM0yQA gnzSpD8WNuR/shrIkwGhWZdvF2mT2RgTfwHrv0ZmkuQ412fyeiow7UJ1nm0l7BRDW2 l9aTtyalx4Ceyq/ZmmC93WVqMtlspEtn3j3mxmLw/eYGbAqZAr8VSGdBVlWq9mS5Io hXjf+soOOqNgA== Received: by phobos.denx.de (Postfix, from userid 109) id 73F87868F8; Tue, 11 Jul 2023 21:43:47 +0200 (CEST) Received: from mail-out.m-online.net (mail-out.m-online.net [212.18.0.9]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by phobos.denx.de (Postfix) with ESMTPS id 8484A8695E for ; Tue, 11 Jul 2023 21:43:45 +0200 (CEST) Authentication-Results: phobos.denx.de; dmarc=fail (p=none dis=none) header.from=denx.de Authentication-Results: phobos.denx.de; spf=fail smtp.mailfrom=sbabic@denx.de Received: from frontend01.mail.m-online.net (unknown [192.168.8.182]) by mail-out.m-online.net (Postfix) with ESMTP id 4R0rsF2Dvjz1r68j; Tue, 11 Jul 2023 21:43:45 +0200 (CEST) Received: from localhost (dynscan1.mnet-online.de [192.168.6.68]) by mail.m-online.net (Postfix) with ESMTP id 4R0rsF26qTz1qqmK; Tue, 11 Jul 2023 21:43:45 +0200 (CEST) X-Amavis-Alert: BAD HEADER SECTION, Missing required header field: "Date" Received: from mail.mnet-online.de ([192.168.8.182]) by localhost (dynscan1.mail.m-online.net [192.168.6.68]) (amavis, port 10024) with ESMTP id 7OMwEHrAEUtE; Tue, 11 Jul 2023 21:43:44 +0200 (CEST) Received: from papero (host-88-217-136-221.customer.m-online.net [88.217.136.221]) by mail.mnet-online.de (Postfix) with ESMTP; Tue, 11 Jul 2023 21:43:44 +0200 (CEST) From: sbabic@denx.de X-Patchwork-Submitter: Lukasz Majewski X-Patchwork-Id: 1778996 X-Patchwork-Delegate: sbabic@denx.de To: Lukasz Majewski ,u-boot@lists.denx.de Subject: [PATCH 3/5] arm: mxs: Provide Kconfig option to not enable 4P2 regulator in IMX28 PMU In-reply-to: <20230509143243.1523791-3-lukma@denx.de> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit MIME-Version: 1.0 Message-Id: <20230711194347.73F87868F8@phobos.denx.de> Date: Tue, 11 Jul 2023 21:43:45 +0200 (CEST) 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 > The IMX28 PMU (Power Management Unit) has a dedicated Linear Regulator > to produce (by default) 4.2V output - available outside the chip as > VDD_4P2. > When system is supposed to not use VDD5V as a main power source - instead > the DCDC_BATT is used; it is safe to disable this regulator. > As the in-PMU DCDC switching regulator (from which DCDC_VDDA, DCDC_VDDIO > and DCDC_VDDD are generated) can be driven from DCDC_BATT or output > of this 4P2 regulator - by disabling the latter the use of the DCDC_BATT > is forced. > To be more specific - according to NXP's AN4199 the DCDC_BATT source is > preferred (over VDD5V), as more efficient and stable source for > industrial applications. > Signed-off-by: Lukasz Majewski Applied to u-boot-imx, master, thanks ! Best regards, Stefano Babic -- ===================================================================== DENX Software Engineering GmbH, Managing Director: Erika Unter HRB 165235 Munich, Office: Kirchenstr.5, 82194 Groebenzell, Germany Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: sbabic@denx.de =====================================================================