On Fri, Oct 09, 2015 at 02:09:39PM +0300, Siarhei Siamashka wrote: > Enable the otg/drc usb controller on the pcDuino1/2 board. Note > that the pcDuino1 FEX file from the vendor contains the following > information in the [usbc0] section: > usb_id_gpio = port:PH04<0><1><default><default> > usb_det_vbus_gpio = port:PH05<0><0><default><default> > usb_drv_vbus_gpio = port:PB09<1><0><default><0> > While the pcDuino2 FEX has: > usb_id_gpio = port:PH04<0><1><default><default> > usb_det_vbus_gpio = port:PH05<0><0><default><default> > usb_drv_vbus_gpio = port:PD02<1><0><default><0> > > The ID pin is indeed PH4. The PD2 pin can be used to switch power > on/off for the USB Type A receptacle on pcDuino2, but it has nothing > to do with the MicroUSB OTG receptacle. The VBUS pin of the MicroUSB > receptacle is always connected to 5V according to the schematics > (both pcDuino1 and pcDuino2) and confirmed by doing some tests on > pcDuino2. The PH5 pin is just one of the pins on the J8 expansion > header and has nothing to do with USB OTG. The PB9 pin is pulled > up and connected to the N_VBUSEN pin of AXP209 PMIC, while the > VBUS pin of AXP209 only has a capacitor between it and the > ground (this pin is not used for anything else). > > To sum it up. Only the ID pin (PH4) has a real use. And 5V voltage > is always served to the MicroUSB OTG receptacle no matter what is > the state of the PB9/PD2 pins. > > This patch has been tested on pcDuino2 to work fine in a host role > with a USB keyboard connected via an OTG cable. It also works fine > in a device role (cdc_ether) with a regular Micro-B cable connected > to a desktop PC. > > Signed-off-by: Siarhei Siamashka <siarhei.siamashka@xxxxxxxxx> Applied, thanks! Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com
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