Hi Alan, Magnus Thank you for your reply > > -- probe -- > > if (pdata->power) > > pdata->power(xxx, 1) > > > > usb_add_hcd() > > > > -- remove -- > > usb_remove_hcd() > > > > if (pdata->power) > > pdata->power(xxx, 0) > > From my point of view this all depends on what the hardware supports. > If the USB host controller hardware can be powered down (power domain > off, clock off) when no USB hardware is connected, but still perform > hotplug detection of a newly added device, then if so then I'd like to > see more fine grained PM support in the drivers. If that's not > possible then I believe the more static approach (on probe/remove) is > fine. Perhaps the latter is a good first step. Thank you. If Alan accepted this idea (= add .power callback), I would like to use this. >> Alan please let me know your opinion. - hotplug power down is difficult on USB host, since host should output VBUS. - this kind of "power ON/OFF" is a platform limited problem (at this point ?) - I don't want create a new confusion (= use simple solution) Best regards --- Kuninori Morimoto -- 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
