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Arjav Patel
cc464ea7f3
Add a new section documenting the TIOCSERGSTRUCT debug ioctl and CONFIG_SERIAL_TIOCSERGSTRUCT Kconfig option. The section covers enabling the feature, how the ioctl copies driver-internal state to user space, example usage with the 16550 UART driver, and a warning about the non-stable nature of exposed structures. Signed-off-by: Arjav Patel <arjav1528@gmail.com>