Re: [PATCH] ARM: dts: AM57xx/DRA7: Update SoC voltage rail limits to match data sheet

From	Tony Lindgren <tony@atomide.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] ARM: dts: AM57xx/DRA7: Update SoC voltage rail limits to match data sheet
Date	2016-04-26 19:10 +0200
Message-ID	<rseEN-2TH-5@gated-at.bofh.it> (permalink)
References	<rpVwC-4GI-11@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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* Nishanth Menon <nm@ti.com> [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.

Regards,

Tony

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[PATCH] ARM: dts: AM57xx/DRA7: Update SoC voltage rail limits to match data sheet Nishanth Menon <nm@ti.com> - 2016-04-20 10:20 +0200
  Re: [PATCH] ARM: dts: AM57xx/DRA7: Update SoC voltage rail limits to  match data sheet Nishanth Menon <nm@ti.com> - 2016-04-26 19:10 +0200
  Re: [PATCH] ARM: dts: AM57xx/DRA7: Update SoC voltage rail limits to  match data sheet Tony Lindgren <tony@atomide.com> - 2016-04-26 19:10 +0200

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