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

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Message-ID: <571F9FD1.2020404@ti.com>
Date:	Tue, 26 Apr 2016 12:05:21 -0500
From:	Nishanth Menon <nm@...com>
To:	Tony Lindgren <tony@...mide.com>
CC:	Benoît Cousson <bcousson@...libre.com>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<devicetree@...r.kernel.org>, <linux-omap@...r.kernel.org>
Subject: Re: [PATCH] ARM: dts: AM57xx/DRA7: Update SoC voltage rail limits to
 match data sheet

On 04/26/2016 12:03 PM, Tony Lindgren wrote:
> * Nishanth Menon <nm@...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.

Thanks. Yep, it is not an emergency regression fix since most of the
platforms out in the field are not impacted.


-- 
Regards,
Nishanth Menon