drivers/serial/serial_nulldev.c

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