On Wed, Jun 01, 2016 at 12:29:59PM +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 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 | 5 +- > drivers/usb/host/ohci-at91.c | 80 +++++++++++++++++++++- > include/soc/at91/at91_sfr.h | 29 ++++++++ > 3 files changed, 111 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..3e3e58a 100644 > --- a/Documentation/devicetree/bindings/usb/atmel-usb.txt > +++ b/Documentation/devicetree/bindings/usb/atmel-usb.txt > @@ -3,8 +3,9 @@ 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 SAMA5D2 which can force to suspend. That may be why you need this now, but that is irrelevant to having a chip specific compatible string. Rob -- 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
