On Thu, Jan 05, 2017 at 02:01:55PM +0800, Peter Chen wrote: > Some hard-wired USB devices need to do power sequence to let the > device work normally, the typical power sequence like: enable USB > PHY clock, toggle reset pin, etc. But current Linux USB driver > lacks of such code to do it, it may cause some hard-wired USB devices > works abnormal or can't be recognized by controller at all. > > In this patch, it calls power sequence library APIs to finish > the power sequence events. It will do power on sequence at hub's > probe for all devices under this hub (includes root hub). > At hub_disconnect, it will do power off sequence which is at powered > on list. > > Signed-off-by: Peter Chen <peter.chen@xxxxxxx> > Tested-by Joshua Clayton <stillcompiling@xxxxxxxxx> > Tested-by: Maciej S. Szmigiero <mail@xxxxxxxxxxxxxxxxxxxxx> > Reviewed-by: Vaibhav Hiremath <hvaibhav.linux@xxxxxxxxx> > --- > drivers/usb/Kconfig | 1 + > drivers/usb/core/hub.c | 48 ++++++++++++++++++++++++++++++++++++++++++++---- > drivers/usb/core/hub.h | 1 + > 3 files changed, 46 insertions(+), 4 deletions(-) > Acked-by: Krzysztof Kozlowski <krzk@xxxxxxxxxx> Tested on Odroid U3 (reset sequence for LAN9730): Tested-by: Krzysztof Kozlowski <krzk@xxxxxxxxxx> Best regards, Krzysztof -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
