From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752254AbcDZRFt (ORCPT ); Tue, 26 Apr 2016 13:05:49 -0400 Received: from devils.ext.ti.com ([198.47.26.153]:51845 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751363AbcDZRFr (ORCPT ); Tue, 26 Apr 2016 13:05:47 -0400 Subject: Re: [PATCH] ARM: dts: AM57xx/DRA7: Update SoC voltage rail limits to match data sheet To: Tony Lindgren References: <1461140319-32026-1-git-send-email-nm@ti.com> <20160426170300.GC5995@atomide.com> CC: =?UTF-8?Q?Beno=c3=aet_Cousson?= , , , , From: Nishanth Menon Message-ID: <571F9FD1.2020404@ti.com> Date: Tue, 26 Apr 2016 12:05:21 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 MIME-Version: 1.0 In-Reply-To: <20160426170300.GC5995@atomide.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/26/2016 12:03 PM, Tony Lindgren wrote: > * Nishanth Menon [160420 01:20]: >> As per the data sheet starting from SPRUHQ0H (Nov 2015 - Latest[1]), >> VDD_CORE can vary from 0.85v to 1.15v for AVS class0. VDD GPU/DSP >> et.al. can range from 0.85v to 1.25V with AVS class0 >> >> Since dynamic voltage scaling is disabled for DRA7/AM57xx SoCs for >> all SoC rails other than MPU, the bootloader is responsible for >> setting up the AVS class0 voltage, however, with wrong voltage machine >> constraints in dtb, regulator framework will lower the voltage below >> the required voltage levels for certain samples in production flow. >> This can cause catastrophic failures which can be pretty hard to >> identify. >> >> Update board files which don't match required specification. >> >> [1] http://www.ti.com/product/AM5728/datasheet/specifications#SPRT637-7340 > > Applying into omap-for-v4.7/dt thanks. This does not apply to > v4.6-rc, so assuming this is not an urgent fix. Thanks. Yep, it is not an emergency regression fix since most of the platforms out in the field are not impacted. -- Regards, Nishanth Menon