my_led_pins = [
            ("led_pins", 0, Pins("P3:2"), IOStandard("LVCMOS33")),
            ("led_pins", 1, Pins("P3:3"), IOStandard("LVCMOS33")),
        ]

        self.platform.add_extension(my_led_pins)
        io_led_pins = self.platform.request("led_pins")
        io_led_pins += self.platform.request("led_pins")

        #my_led_pin = self.platform.request(0, Pins("P3:0"))
        self.submodules.led = gpio.GPIOOut(io_led_pins)
        self.csr_devices.append("my_led_pins")