From: Tony Lindgren <tony@atomide.com>
To: Roger Quadros <rogerq@ti.com>
Cc: Nishanth Menon <nm@ti.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
linux-omap@vger.kernel.org
Subject: Re: [PATCH] ARM: dts: dra7-evm: Keep all VDD rails always-on
Date: Mon, 10 Nov 2014 12:39:23 -0800 [thread overview]
Message-ID: <20141110203922.GX31454@atomide.com> (raw)
In-Reply-To: <54579476.10702@ti.com>
* Roger Quadros <rogerq@ti.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@ti.com>
>
> Acked-by: Roger Quadros <rogerq@ti.com>
>
> I'm assuming that vddshv8 (MMC1 power group) can be switched off.
Applying into omap-for-v3.19/dt thanks.
Tony
prev parent reply other threads:[~2014-11-10 20:40 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-21 14:38 [PATCH] ARM: dts: dra7-evm: Keep all VDD rails always-on Nishanth Menon
2014-11-03 14:43 ` Roger Quadros
2014-11-10 20:39 ` Tony Lindgren [this message]
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