From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexandre Belloni Subject: Re: [PATCH v3 1/2] usb: ohci-at91: Forcibly suspend ports while USB suspend Date: Wed, 8 Jun 2016 22:38:10 +0200 Message-ID: <20160608203810.GF2466@piout.net> References: <1465359311-14544-1-git-send-email-wenyou.yang@atmel.com> <1465359311-14544-2-git-send-email-wenyou.yang@atmel.com> <20160608202651.GA23604@rob-hp-laptop> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20160608202651.GA23604@rob-hp-laptop> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Rob Herring Cc: Wenyou Yang , Alan Stern , Greg Kroah-Hartman , Nicolas Ferre , Pawel Moll , Mark Brown , Ian Campbell , Kumar Gala , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: devicetree@vger.kernel.org On 08/06/2016 at 15:26:51 -0500, Rob Herring wrote : > On Wed, Jun 08, 2016 at 12:15:10PM +0800, Wenyou Yang wrote: > > In order to the save power consumption, as a workaround, suspend > > forcibly the USB PORTA/B/C via set the SUSPEND_A/B/C bits of OHCI > > Interrupt Configuration Register in the SFRs while OHCI USB suspend. > > > > This suspend operation must be done before the USB clock is disabled, > > resume after the USB clock is enabled. > > > > Signed-off-by: Wenyou Yang > > --- > > > > Changes in v3: > > - Change the compatible description for more precise. > > > > Changes in v2: > > - Add compatible to support forcibly suspend the ports. > > - Add soc/at91/at91_sfr.h to accommodate the defines. > > - Add error checking for .sfr_regmap. > > - Remove unnecessary regmap_read() statement. > > > > .../devicetree/bindings/usb/atmel-usb.txt | 6 +- > > drivers/usb/host/ohci-at91.c | 80 +++++++++++++++++++++- > > include/soc/at91/at91_sfr.h | 29 ++++++++ > > 3 files changed, 112 insertions(+), 3 deletions(-) > > create mode 100644 include/soc/at91/at91_sfr.h > > > > diff --git a/Documentation/devicetree/bindings/usb/atmel-usb.txt b/Documentation/devicetree/bindings/usb/atmel-usb.txt > > index 5883b73..888deaa 100644 > > --- a/Documentation/devicetree/bindings/usb/atmel-usb.txt > > +++ b/Documentation/devicetree/bindings/usb/atmel-usb.txt > > @@ -3,8 +3,10 @@ Atmel SOC USB controllers > > OHCI > > > > Required properties: > > - - compatible: Should be "atmel,at91rm9200-ohci" for USB controllers > > - used in host mode. > > + - compatible: Should be one of the following > > + "atmel,at91rm9200-ohci" for USB controllers used in host mode. > > + "atmel,sama5d2-ohci" for USB controllers used in host mode > > + on SAMA5D2 which can force to suspend. > > Guess I wasn't clear enough before. Drop "which can force to suspend". > Well, my point is that we don't need a new compatible anyway. -- Alexandre Belloni, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html