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