/sys/devices/platform/serial8250/tty/ttyS3
Directories:

• /sys/devices/platform/serial8250/tty
• /sys/devices/platform/serial8250/tty/ttyS3/power
• /sys/devices/platform/serial8250
• /sys/class/tty

Files:

• uevent
• iomem_reg_shift
• line
• xmit_fifo_size
• port
• uartclk
• dev
• type
• iomem_base
• custom_divisor
• io_type
• irq
• close_delay
• closing_wait
• flags