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

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Date:	Mon, 7 Jul 2014 01:29:22 -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> [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:

Acked-by: Tony Lindgren <tony@...mide.com>

> ---
>  arch/arm/boot/dts/dra7-evm.dts | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/boot/dts/dra7-evm.dts b/arch/arm/boot/dts/dra7-evm.dts
> index 4adc280..8308954 100644
> --- a/arch/arm/boot/dts/dra7-evm.dts
> +++ b/arch/arm/boot/dts/dra7-evm.dts
> @@ -240,6 +240,7 @@
>  					regulator-name = "ldo3";
>  					regulator-min-microvolt = <1800000>;
>  					regulator-max-microvolt = <1800000>;
> +					regulator-always-on;
>  					regulator-boot-on;
>  				};
>  
> -- 
> 1.8.3.2
> 
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