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 <wenyou.yang@xxxxxxxxx> > > --- > > > > 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 linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
