[ Adding linux-usb as other may be interested in this. ] On Thu, Jul 05, 2018 at 01:57:29PM +0100, Antonio Santagiuliana wrote: > Thank you for the information. > What I don't understand is that if I use the CP2105 are its GPIOs usable by > this driver ? Yes, they should be. But if I remember correctly, the pins in question are muxed with different functions, so you need to make sure that the device is configured correctly (e.g. using some silabs tool). > If so, which is the interface to the user space ? I can open the driver > usbserial but from the Raspberry pi user space I don't understand where the > GPIOs from this chip are mapped to or how I should map them by creating a > node with mknod ? You can access them from /sys/class/gpio or using the new gpiolib chardev interface as any other gpios. If the gpios are recognised and registered, they should also show up in sysfs as a child device to the USB interface in question, for example as: /sys/bus/usb/devices/1-1.1\:1.0/gpio/gpiochipN Good luck, Johan -- 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
