1cac73f20SKeng Soon Cheah /* 2cac73f20SKeng Soon Cheah * Copyright (c) 2015 National Instruments 3cac73f20SKeng Soon Cheah * 4cac73f20SKeng Soon Cheah * SPDX-License-Identifier: GPL-2.0+ 5cac73f20SKeng Soon Cheah */ 6cac73f20SKeng Soon Cheah 7cac73f20SKeng Soon Cheah #include <common.h> 8cac73f20SKeng Soon Cheah #include <dm.h> 9cac73f20SKeng Soon Cheah #include <serial.h> 10cac73f20SKeng Soon Cheah 11cac73f20SKeng Soon Cheah static int nulldev_serial_setbrg(struct udevice *dev, int baudrate) 12cac73f20SKeng Soon Cheah { 13cac73f20SKeng Soon Cheah return 0; 14cac73f20SKeng Soon Cheah } 15cac73f20SKeng Soon Cheah 16cac73f20SKeng Soon Cheah static int nulldev_serial_getc(struct udevice *dev) 17cac73f20SKeng Soon Cheah { 18cac73f20SKeng Soon Cheah return -EAGAIN; 19cac73f20SKeng Soon Cheah } 20cac73f20SKeng Soon Cheah 21*b12907f2SWilson Lee static int nulldev_serial_pending(struct udevice *dev, bool input) 22*b12907f2SWilson Lee { 23*b12907f2SWilson Lee return 0; 24*b12907f2SWilson Lee } 25*b12907f2SWilson Lee 26cac73f20SKeng Soon Cheah static int nulldev_serial_input(struct udevice *dev) 27cac73f20SKeng Soon Cheah { 28cac73f20SKeng Soon Cheah return 0; 29cac73f20SKeng Soon Cheah } 30cac73f20SKeng Soon Cheah 31cac73f20SKeng Soon Cheah static int nulldev_serial_putc(struct udevice *dev, const char ch) 32cac73f20SKeng Soon Cheah { 33cac73f20SKeng Soon Cheah return 0; 34cac73f20SKeng Soon Cheah } 35cac73f20SKeng Soon Cheah 36cac73f20SKeng Soon Cheah static const struct udevice_id nulldev_serial_ids[] = { 37cac73f20SKeng Soon Cheah { .compatible = "nulldev-serial" }, 38cac73f20SKeng Soon Cheah { } 39cac73f20SKeng Soon Cheah }; 40cac73f20SKeng Soon Cheah 41cac73f20SKeng Soon Cheah 42cac73f20SKeng Soon Cheah const struct dm_serial_ops nulldev_serial_ops = { 43cac73f20SKeng Soon Cheah .putc = nulldev_serial_putc, 44*b12907f2SWilson Lee .pending = nulldev_serial_pending, 45cac73f20SKeng Soon Cheah .getc = nulldev_serial_getc, 46cac73f20SKeng Soon Cheah .setbrg = nulldev_serial_setbrg, 47cac73f20SKeng Soon Cheah }; 48cac73f20SKeng Soon Cheah 49cac73f20SKeng Soon Cheah U_BOOT_DRIVER(serial_nulldev) = { 50cac73f20SKeng Soon Cheah .name = "serial_nulldev", 51cac73f20SKeng Soon Cheah .id = UCLASS_SERIAL, 52cac73f20SKeng Soon Cheah .of_match = nulldev_serial_ids, 53cac73f20SKeng Soon Cheah .ops = &nulldev_serial_ops, 54cac73f20SKeng Soon Cheah }; 55