drivers/serial/serial_nulldev.c

   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 };