[PATCH v2 1/2] usb: ohci-at91: Forcibly suspend ports while USB suspend

Rob Herring
2016-06-03T01:54:09Z

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@atmel.com>
> ---
>
> 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