You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: bcm2xxx_gpio.rs
    path of file: ./repos/rust-raspberrypi-OS-tutorials/18_backtrace/kernel/src/bsp/device_driver/bcm
    
    the code of the file until where you have to start completion: // SPDX-License-Identifier: MIT OR Apache-2.0
//
// Copyright (c) 2018-2023 Andre Richter <andre.o.richter@gmail.com>

//! GPIO Driver.

use crate::{
    bsp::device_driver::common::MMIODerefWrapper,
    driver,
    exception::asynchronous::IRQNumber,
    memory::{Address, Virtual},
    synchronization,
    synchronization::IRQSafeNullLock,
};
use tock_re
    
    fn disable_pud_14_15_bcm2837(&mut self) {
        use crate::time;
        use core::time::Duration;

        // The Linux 2837 GPIO driver waits 1 Âµs between the steps.
        const DELAY: Duration = Duration::from_micros(1);

        self.registers.GPPUD.write(GPPUD::PUD::Off);
        time::time_manager().spin_for(DELAY);

        self.registers
            .GPPUDCLK0
            .write(GPPUDCLK0::PUDCLK15::AssertClock + GPPUDCLK0::PUDCLK14::AssertClock);
        time::time_manager().spin_for(DELAY);

        self.registers.GPPUD.write(GPPUD::PUD::Off);
        self.registers.GPPUDCLK0.set(0);
    }