On Mon, Oct 5, 2015 at 2:58 AM, Siarhei Siamashka <siarhei.siamashka@xxxxxxxxx> wrote: > The pcDuino1 board does not use any power switches at all for its > two USB host ports and the VBUS pins are always connected to 5V. > > The pcDuino2 board uses the RT9701GB power switch for its single > USB host port, but the USB_EN pin (PD2) is pulled up with a 10K > resistor. So that the USB power is still enabled by default even > if nobody bothers to configure the PD2 pin or runs the pcDuino1 > firmware. Seems like it would be better if you had a regulator controlled by PD2. At least can shut down VBUS power when it wants to? ChenYu > The current dts file unnecessarily meddles with the PH3 and PH6 > pins. But the PH6 pin is available on the J11 expansion header > and may have a better use for other purposes. This patch fixes > the problem and now the PH6 pin can be used with the GPIO sysfs > interface. Tested on a pcDuino2 board and confirmed the voltage > on the PH6 pin with a multimeter: > > echo 230 > /sys/class/gpio/export > echo "out" > /sys/class/gpio/gpio230/direction > echo 0 > /sys/class/gpio/gpio230/value > echo 1 > /sys/class/gpio/gpio230/value > > USB still works as expected too. > > Signed-off-by: Siarhei Siamashka <siarhei.siamashka@xxxxxxxxx> > --- > arch/arm/boot/dts/sun4i-a10-pcduino.dts | 10 ---------- > 1 file changed, 10 deletions(-) -- 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
