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 X-Spam-Level: X-Spam-Status: No, score=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0F0A8C43381 for ; Wed, 20 Mar 2019 14:57:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D36B72184E for ; Wed, 20 Mar 2019 14:57:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553093877; bh=T0v3mC9gcjZco22oC2GtkruAbqGtQdlJ6jnw55IJ6GI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=DBNzfhwahRmtjYl5hRrRDixS4LUAQR3FePlkB44+uLitKBSe5OQQj7nHpULLDPIyI P2Nz1AfR9DtvfpPQFevq/Zjfr9+39KlJDFdnGwaBOupRXoiTUyisWimOswFCzYLnk2 oXvkiLuQyIWVyCTB7q44hJDEqtAbgtKjGemwq7T0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728382AbfCTO54 (ORCPT ); Wed, 20 Mar 2019 10:57:56 -0400 Received: from mail.kernel.org ([198.145.29.99]:54444 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726686AbfCTO54 (ORCPT ); Wed, 20 Mar 2019 10:57:56 -0400 Received: from dragon (98.142.130.235.16clouds.com [98.142.130.235]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5C0202146E; Wed, 20 Mar 2019 14:57:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553093876; bh=T0v3mC9gcjZco22oC2GtkruAbqGtQdlJ6jnw55IJ6GI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Y88DFhQ9w/2i5vAndYVhVq4E68epUb3PVlWKsjHBErQbCu31AVKIf8XjhUsirCatU HwmetE+ahbdrIFscyeSGcxqC7ZtjIH+dpzptQcgwN+0VjOmioD5XlHHRlMzqRLOspN vtzfhlz0fQfFmgnUDK+D/g9RialJU7LzQxgs4LCA= Date: Wed, 20 Mar 2019 22:57:25 +0800 From: Shawn Guo To: Adam Ford Cc: arm-soc , Rob Herring , Mark Rutland , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , devicetree , Linux Kernel Mailing List Subject: Re: [PATCH 2/3] ARM: DTS: imx6q-logicpd: Reduce inrush current on start Message-ID: <20190320145723.GE8337@dragon> References: <20190306140402.17122-1-aford173@gmail.com> <20190306140402.17122-2-aford173@gmail.com> <20190320124446.GO4980@dragon> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Mar 20, 2019 at 08:41:27AM -0500, Adam Ford wrote: > On Wed, Mar 20, 2019 at 7:45 AM Shawn Guo wrote: > > > > On Wed, Mar 06, 2019 at 08:04:00AM -0600, Adam Ford wrote: > > > The main 3.3V regulator sources a series of additional regulators. > > > This patch adds a small delay, so when the 3.3V regulator comes > > > on it delays a bit before the subsequent regulators can come on. > > > This reduces the inrush current a bit on the external DC power > > > supply. > > > > > > Fixes: 1c207f911fe9 ("ARM: dts: imx: Add support for Logic PD > > > i.MX6QD EVM") > > > > Same comment as patch #1. > > The sourcing regulator occasionally cuts out because the inrush is so > high. I would argue that preventing a hardware issue like that would > be a 'fix' and if it helps, I could add that to the description. Yes, if you would like to get it in as a fix, please elaborate the real world issue it fixes. Shawn