diff options
| author | Crescent Hsieh <crescentcy.hsieh@moxa.com> | 2026-07-31 15:48:16 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-08-03 16:51:57 +0200 |
| commit | af1ba61b62be975902c5a4babcc7952f6dfdbd29 (patch) | |
| tree | 1928c5d70730148a5b7739b1cbaf284327e02ccf /include/linux | |
| parent | d21a1509c62386200c09ed102983b8d79a1b0485 (diff) | |
serial: 8250: allow low-level drivers to override break control
Some UARTs require driver-specific handling for break signaling, which
cannot be expressed by the generic 8250 break implementation alone.
Add an optional uart_port break_ctl callback and route
serial8250_break_ctl() through it when provided. Rename the existing
8250 implementation to serial8250_do_break_ctl() and export it so
low-level drivers can reuse the default 8250 behavior when appropriate.
Signed-off-by: Crescent Hsieh <crescentcy.hsieh@moxa.com>
Link: https://patch.msgid.link/20260731074820.735619-11-crescentcy.hsieh@moxa.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/serial_8250.h | 1 | ||||
| -rw-r--r-- | include/linux/serial_core.h | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h index eba36710bc47..eeb868e93e15 100644 --- a/include/linux/serial_8250.h +++ b/include/linux/serial_8250.h @@ -204,6 +204,7 @@ void serial8250_do_shutdown(struct uart_port *port); void serial8250_do_pm(struct uart_port *port, unsigned int state, unsigned int oldstate); void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl); +void serial8250_do_break_ctl(struct uart_port *port, int break_state); void serial8250_do_set_divisor(struct uart_port *port, unsigned int baud, unsigned int quot); int fsl8250_handle_irq(struct uart_port *port); diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index c4cc4f66af4b..a7fd24f9e908 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -464,6 +464,7 @@ struct uart_port { void (*shutdown)(struct uart_port *port); void (*throttle)(struct uart_port *port); void (*unthrottle)(struct uart_port *port); + void (*break_ctl)(struct uart_port *port, int break_state); int (*handle_irq)(struct uart_port *); void (*pm)(struct uart_port *, unsigned int state, unsigned int old); |