Index of /sys/dev/char/4:68/subsystem/tty16/subsystem/ttyS21

• Parent Directory
• close_delay
• closing_wait
• custom_divisor
• dev
• device/
• flags
• io_type
• iomem_base
• iomem_reg_shift
• irq
• line
• port
• power/
• subsystem/
• type
• uartclk
• uevent
• xmit_fifo_size