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 
10 static int nulldev_serial_setbrg(struct udevice *dev, int baudrate)
11 {
12 	return 0;
13 }
14 
15 static int nulldev_serial_getc(struct udevice *dev)
16 {
17 	return -EAGAIN;
18 }
19 
20 static int nulldev_serial_pending(struct udevice *dev, bool input)
21 {
22 	return 0;
23 }
24 
25 static int nulldev_serial_input(struct udevice *dev)
26 {
27 	return 0;
28 }
29 
30 static int nulldev_serial_putc(struct udevice *dev, const char ch)
31 {
32 	return 0;
33 }
34 
35 static const struct udevice_id nulldev_serial_ids[] = {
36 	{ .compatible = "nulldev-serial" },
37 	{ }
38 };
39 
40 
41 const struct dm_serial_ops nulldev_serial_ops = {
42 	.putc = nulldev_serial_putc,
43 	.pending = nulldev_serial_pending,
44 	.getc = nulldev_serial_getc,
45 	.setbrg = nulldev_serial_setbrg,
46 };
47 
48 U_BOOT_DRIVER(serial_nulldev) = {
49 	.name	= "serial_nulldev",
50 	.id	= UCLASS_SERIAL,
51 	.of_match = nulldev_serial_ids,
52 	.ops	= &nulldev_serial_ops,
53 };
54