From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tony Lindgren Subject: Re: [PATCH v2 1/6] ARM: dts: dra7-evm: Make VDDA_1V8_PHY supply always on Date: Mon, 7 Jul 2014 01:29:22 -0700 Message-ID: <20140707082922.GI28884@atomide.com> References: <1404467748-12154-1-git-send-email-rogerq@ti.com> <1404467748-12154-2-git-send-email-rogerq@ti.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1404467748-12154-2-git-send-email-rogerq-l0cyMroinI0@public.gmane.org> Sender: linux-usb-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Roger Quadros Cc: kishon-l0cyMroinI0@public.gmane.org, balbi-l0cyMroinI0@public.gmane.org, nsekhar-l0cyMroinI0@public.gmane.org, nm-l0cyMroinI0@public.gmane.org, george.cherian-l0cyMroinI0@public.gmane.org, sergei.shtylyov-M4DtvfQ/ZS1MRgGoP+s0PdBPR1lH4CV8@public.gmane.org, linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Rajendra Nayak , Tero Kristo List-Id: linux-omap@vger.kernel.org * Roger Quadros [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 > CC: Tero Kristo > Signed-off-by: Roger Quadros Best that you queue this with the series: Acked-by: Tony Lindgren > --- > 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 > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752162AbaGGI30 (ORCPT ); Mon, 7 Jul 2014 04:29:26 -0400 Received: from mho-03-ewr.mailhop.org ([204.13.248.66]:15001 "EHLO mho-01-ewr.mailhop.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751227AbaGGI3W (ORCPT ); Mon, 7 Jul 2014 04:29:22 -0400 X-Mail-Handler: Dyn Standard SMTP by Dyn X-Originating-IP: 99.127.230.128 X-Report-Abuse-To: abuse@dyndns.com (see http://www.dyndns.com/services/sendlabs/outbound_abuse.html for abuse reporting information) X-MHO-User: U2FsdGVkX1+AD1bo1yTs8jsDeEA68q1+ Date: Mon, 7 Jul 2014 01:29:22 -0700 From: Tony Lindgren To: Roger Quadros Cc: kishon@ti.com, balbi@ti.com, nsekhar@ti.com, nm@ti.com, george.cherian@ti.com, sergei.shtylyov@cogentembedded.com, linux-omap@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Rajendra Nayak , Tero Kristo Subject: Re: [PATCH v2 1/6] ARM: dts: dra7-evm: Make VDDA_1V8_PHY supply always on Message-ID: <20140707082922.GI28884@atomide.com> References: <1404467748-12154-1-git-send-email-rogerq@ti.com> <1404467748-12154-2-git-send-email-rogerq@ti.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1404467748-12154-2-git-send-email-rogerq@ti.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Roger Quadros [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 > CC: Tero Kristo > Signed-off-by: Roger Quadros Best that you queue this with the series: Acked-by: Tony Lindgren > --- > 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 >