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2 .\" SPDX-License-Identifier: BSD-2-Clause
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72 EIA RS-232C (CCITT V.24) serial communications interface.
109 At the heart of the
112 It contains the bus attachments and the low-level interrupt handler.
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195 Invert the pulse (RS-232 logic low = ASSERT, high = CLEAR).
216 RFC 2783 defines an ASSERT event as a higher-voltage line level, and a CLEAR
217 event as a lower-voltage line level, in the context of the RS-232 protocol.
218 The modem control signals on a TTL-level connection are typically
219 inverted from the RS-232 levels.
220 For example, carrier presence is indicated by a high signal on an RS-232
223 TTL and RS-232 line levels in most hardware designs.
224 Generally speaking, a connection to a DB-9 style connector is an RS-232
226 A connection to header pins or an edge-connector on an embedded board
231 driver also supports an initial-state and a lock-state control
234 from those of the corresponding initial-state device
238 in the normal way on the initial-state devices to program
245 on the lock-state device.
247 may be locked by setting the corresponding value in the lock-state
251 on the initial-state device and
253 on the lock-state device.
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286 Enable the so-called
289 For NS 16550-compatible devices, this will use heuristics to ensure that the
291 DesignWare-based UARTs need this due to a design flaw in the UART.
294 The data rate (bits per second) used for communications on the serial port.
295 When the device clock rate (see below) is set to 0, then the baud rate will be
296 used with the divisor to compute the device clock rate the first time the device
301 Otherwise the baud rate must be a multiple of 75.
304 driver to not program the baud rate divisor and use the hardware as-is.
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328 Specifies the physical address of a memory-mapped UART.
351 When set to 0, and the baud rate is also set, the UART's initialization
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363 corresponding callin initial-state and lock-state devices
369 corresponding callout initial-state and lock-state devices
375 COM2 instead of COM1 and set the baud rate to 115200.