linux-kernel - Re: [PATCH v2 1/6] ARM: dts: dra7-evm: Make VDDA_1V8

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Date:	Mon, 7 Jul 2014 01:44:32 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Roger Quadros <rogerq@...com>
Cc:	kishon@...com, balbi@...com, nsekhar@...com, nm@...com,
	george.cherian@...com, sergei.shtylyov@...entembedded.com,
	linux-omap@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, Rajendra Nayak <rnayak@...com>,
	Tero Kristo <t-kristo@...com>
Subject: Re: [PATCH v2 1/6] ARM: dts: dra7-evm: Make VDDA_1V8_PHY supply
 always on

* Roger Quadros <rogerq@...com> [140707 01:36]:
> Hi Tony,
> 
> On 07/07/2014 11:29 AM, Tony Lindgren wrote:
> > * Roger Quadros <rogerq@...com> [140704 02:57]:
> >> After clarification from the hardware team it was found that
> >> this 1.8V PHY supply can't be switched OFF when SoC is Active.
> >>
> >> Since the PHY IPs don't contain isolation logic built in the design to
> >> allow the power rail to be switched off, there is a very high risk
> >> of IP reliability and additional leakage paths which can result in
> >> additional power consumption.
> >>
> >> The only scenario where this rail can be switched off is part of Power on
> >> reset sequencing, but it needs to be kept always-on during operation.
> >>
> >> This patch is required for proper functionality of USB, SATA
> >> and PCIe on DRA7-evm.
> >>
> >> CC: Rajendra Nayak <rnayak@...com>
> >> CC: Tero Kristo <t-kristo@...com>
> >> Signed-off-by: Roger Quadros <rogerq@...com>
> > 
> > Best that you queue this with the series:
> 
> This patch doesn't have any dependency with the others and we're not even sure if
> this series will hit 3.16.
> 
> But this 1V8 regulator _is_ required for normal operation of the SoC, whether the
> PHYs are in use or not.
> 
> Can you please queue just this patch for SoC fixes for 3.16? Thanks.

OK will do.

Regards,

Tony
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