What:		/sys/class/tty/console/active
Date:		Nov 2010
Contact:	Kay Sievers <kay.sievers@vrfy.org>
Description:
		 Shows the list of currently configured
		 console devices, like 'tty1 ttyS0'.
		 The last entry in the file is the active
		 device connected to /dev/console.
		 The file supports poll() to detect virtual
		 console switches.

What:		/sys/class/tty/tty0/active
Date:		Nov 2010
Contact:	Kay Sievers <kay.sievers@vrfy.org>
Description:
		 Shows the currently active virtual console
		 device, like 'tty1'.
		 The file supports poll() to detect virtual
		 console switches.

What:		/sys/class/tty/ttyS0/uartclk
Date:		Sep 2012
Contact:	Tomas Hlavacek <tmshlvck@gmail.com>
Description:
		 Shows the current uartclk value associated with the
		 UART port in serial_core, that is bound to TTY like ttyS0.
		 uartclk = 16 * baud_base

		 These sysfs values expose the TIOCGSERIAL interface via
		 sysfs rather than via ioctls.

What:		/sys/class/tty/ttyS0/type
Date:		October 2012
Contact:	Alan Cox <alan@linux.intel.com>
Description:
		 Shows the current tty type for this port.

		 These sysfs values expose the TIOCGSERIAL interface via
		 sysfs rather than via ioctls.

What:		/sys/class/tty/ttyS0/line
Date:		October 2012
Contact:	Alan Cox <alan@linux.intel.com>
Description:
		 Shows the current tty line number for this port.

		 These sysfs values expose the TIOCGSERIAL interface via
		 sysfs rather than via ioctls.

What:		/sys/class/tty/ttyS0/port
Date:		October 2012
Contact:	Alan Cox <alan@linux.intel.com>
Description:
		 Shows the current tty port I/O address for this port.

		 These sysfs values expose the TIOCGSERIAL interface via
		 sysfs rather than via ioctls.

What:		/sys/class/tty/ttyS0/irq
Date:		October 2012
Contact:	Alan Cox <alan@linux.intel.com>
Description:
		 Shows the current primary interrupt for this port.

		 These sysfs values expose the TIOCGSERIAL interface via
		 sysfs rather than via ioctls.

What:		/sys/class/tty/ttyS0/flags
Date:		October 2012
Contact:	Alan Cox <alan@linux.intel.com>
Description:
		 Show the tty port status flags for this port.

		 These sysfs values expose the TIOCGSERIAL interface via
		 sysfs rather than via ioctls.

What:		/sys/class/tty/ttyS0/xmit_fifo_size
Date:		October 2012
Contact:	Alan Cox <alan@linux.intel.com>
Description:
		 Show the transmit FIFO size for this port.

		 These sysfs values expose the TIOCGSERIAL interface via
		 sysfs rather than via ioctls.

What:		/sys/class/tty/ttyS0/close_delay
Date:		October 2012
Contact:	Alan Cox <alan@linux.intel.com>
Description:
		 Show the closing delay time for this port in ms.

		 These sysfs values expose the TIOCGSERIAL interface via
		 sysfs rather than via ioctls.

What:		/sys/class/tty/ttyS0/closing_wait
Date:		October 2012
Contact:	Alan Cox <alan@linux.intel.com>
Description:
		 Show the close wait time for this port in ms.

		 These sysfs values expose the TIOCGSERIAL interface via
		 sysfs rather than via ioctls.

What:		/sys/class/tty/ttyS0/custom_divisor
Date:		October 2012
Contact:	Alan Cox <alan@linux.intel.com>
Description:
		 Show the custom divisor if any that is set on this port.

		 These sysfs values expose the TIOCGSERIAL interface via
		 sysfs rather than via ioctls.

What:		/sys/class/tty/ttyS0/io_type
Date:		October 2012
Contact:	Alan Cox <alan@linux.intel.com>
Description:
		 Show the I/O type that is to be used with the iomem base
		 address.

		 These sysfs values expose the TIOCGSERIAL interface via
		 sysfs rather than via ioctls.

What:		/sys/class/tty/ttyS0/iomem_base
Date:		October 2012
Contact:	Alan Cox <alan@linux.intel.com>
Description:
		 The I/O memory base for this port.

		 These sysfs values expose the TIOCGSERIAL interface via
		 sysfs rather than via ioctls.

What:		/sys/class/tty/ttyS0/iomem_reg_shift
Date:		October 2012
Contact:	Alan Cox <alan@linux.intel.com>
Description:
		 Show the register shift indicating the spacing to be used
		 for accesses on this iomem address.

		 These sysfs values expose the TIOCGSERIAL interface via
		 sysfs rather than via ioctls.