linux-kernel - Re: [PATCH] ARM: dts: dra7-evm: Keep all VDD rails always-on

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Date:	Mon, 10 Nov 2014 12:39:23 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	Roger Quadros <rogerq@...com>
Cc:	Nishanth Menon <nm@...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: dra7-evm: Keep all VDD rails always-on

* Roger Quadros <rogerq@...com> [141103 06:44]:
> Hi Nishant,
> 
> On 10/21/2014 05:38 PM, Nishanth Menon wrote:
> > DRA7 Data Manual (SPRS857L - August 2014) section 4.1.1 states: "All
> > unused power supply balls must be supplied with the voltages specified
> > in the Section 5.2, Recommended Operating Conditions".
> > 
> > This implies that all unused voltage rails for Vayu can never be
> > switched off even if the hardware blocks inside that voltage domain is
> > unused. Switching off these unused rails may result in stability issues
> > on other domains and increased leakage and power-on-hour impacts.
> > 
> > J6eco-evm dts file already considers this, however j6evm-dts file needs
> > to be fixed to consider this constraint of the SoC.
> > 
> > Signed-off-by: Nishanth Menon <nm@...com>
> 
> Acked-by: Roger Quadros <rogerq@...com>
> 
> I'm assuming that vddshv8 (MMC1 power group) can be switched off.

Applying into omap-for-v3.19/dt thanks.

Tony
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