From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nishanth Menon Subject: Re: [PATCH] ARM: dts: AM57xx/DRA7: Update SoC voltage rail limits to match data sheet Date: Tue, 26 Apr 2016 12:05:21 -0500 Message-ID: <571F9FD1.2020404@ti.com> References: <1461140319-32026-1-git-send-email-nm@ti.com> <20160426170300.GC5995@atomide.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20160426170300.GC5995-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Tony Lindgren Cc: =?UTF-8?Q?Beno=c3=aet_Cousson?= , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: devicetree@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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html