diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/serial/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/serial/Makefile | 1 | ||||
| -rw-r--r-- | drivers/serial/serial_nulldev.c | 48 |
3 files changed, 56 insertions, 0 deletions
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig index aeed538fa4..13b2550d3b 100644 --- a/drivers/serial/Kconfig +++ b/drivers/serial/Kconfig @@ -414,6 +414,13 @@ config MXC_UART If you have a machine based on a Motorola IMX CPU you can enable its onboard serial port by enabling this option. +config NULLDEV_SERIAL + bool "Null serial device" + help + Select this to enable null serial device support. A null serial + device merely acts as a placeholder for a serial device and does + nothing for all it's operation. + config PIC32_SERIAL bool "Support for Microchip PIC32 on-chip UART" depends on DM_SERIAL && MACH_PIC32 diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile index 72a6996a0a..7adcee3e10 100644 --- a/drivers/serial/Makefile +++ b/drivers/serial/Makefile @@ -49,6 +49,7 @@ obj-$(CONFIG_BCM283X_MU_SERIAL) += serial_bcm283x_mu.o obj-$(CONFIG_MSM_SERIAL) += serial_msm.o obj-$(CONFIG_MVEBU_A3700_UART) += serial_mvebu_a3700.o obj-$(CONFIG_MPC8XX_CONS) += serial_mpc8xx.o +obj-$(CONFIG_NULLDEV_SERIAL) += serial_nulldev.o ifndef CONFIG_SPL_BUILD obj-$(CONFIG_USB_TTY) += usbtty.o diff --git a/drivers/serial/serial_nulldev.c b/drivers/serial/serial_nulldev.c new file mode 100644 index 0000000000..07683086db --- /dev/null +++ b/drivers/serial/serial_nulldev.c @@ -0,0 +1,48 @@ +/* + * Copyright (c) 2015 National Instruments + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm.h> +#include <serial.h> + +static int nulldev_serial_setbrg(struct udevice *dev, int baudrate) +{ + return 0; +} + +static int nulldev_serial_getc(struct udevice *dev) +{ + return -EAGAIN; +} + +static int nulldev_serial_input(struct udevice *dev) +{ + return 0; +} + +static int nulldev_serial_putc(struct udevice *dev, const char ch) +{ + return 0; +} + +static const struct udevice_id nulldev_serial_ids[] = { + { .compatible = "nulldev-serial" }, + { } +}; + + +const struct dm_serial_ops nulldev_serial_ops = { + .putc = nulldev_serial_putc, + .getc = nulldev_serial_getc, + .setbrg = nulldev_serial_setbrg, +}; + +U_BOOT_DRIVER(serial_nulldev) = { + .name = "serial_nulldev", + .id = UCLASS_SERIAL, + .of_match = nulldev_serial_ids, + .ops = &nulldev_serial_ops, +}; |