1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Copyright (c) 2015 National Instruments 4 */ 5 6#include <common.h> 7#include <dm.h> 8#include <serial.h> 9 10static int nulldev_serial_setbrg(struct udevice *dev, int baudrate) 11{ 12 return 0; 13} 14 15static int nulldev_serial_getc(struct udevice *dev) 16{ 17 return -EAGAIN; 18} 19 20static int nulldev_serial_pending(struct udevice *dev, bool input) 21{ 22 return 0; 23} 24 25static int nulldev_serial_putc(struct udevice *dev, const char ch) 26{ 27 return 0; 28} 29 30static const struct udevice_id nulldev_serial_ids[] = { 31 { .compatible = "nulldev-serial" }, 32 { } 33}; 34 35 36const struct dm_serial_ops nulldev_serial_ops = { 37 .putc = nulldev_serial_putc, 38 .pending = nulldev_serial_pending, 39 .getc = nulldev_serial_getc, 40 .setbrg = nulldev_serial_setbrg, 41}; 42 43U_BOOT_DRIVER(serial_nulldev) = { 44 .name = "serial_nulldev", 45 .id = UCLASS_SERIAL, 46 .of_match = nulldev_serial_ids, 47 .ops = &nulldev_serial_ops, 48}; 49