diff options
| author | Hugo Villeneuve <hvilleneuve@dimonoff.com> | 2026-05-21 14:16:53 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-07-10 14:50:13 +0200 |
| commit | 44b374622a3f93f2f9ce0a782f3fedb7cd758b6b (patch) | |
| tree | 2a8ab0b91a57c1701cbadf9c9be7e14e7b04ad90 /include | |
| parent | 650d60c734ced3c0efa115d6bad031a24680be4e (diff) | |
serial: core: add new I/O type for SPI and I2C bus devices
I2C/SPI serial drivers don't use the following struct uart_port variables:
port->membase
port->mapbase
port->iobase
However, they are forced to set membase to a non-zero value so that
uart_configure_port() will succeed because of the following check:
/* If there isn't a port here, don't do anything further. */
if (!port->iobase && !port->mapbase && !port->membase)
return;
Add a new I/O type for SPI and I2C bus devices to remove the need to
implement the kind of above-mentioned ambiguous workarounds to make them
work. Now that UART report functions are using uart_iotype_*() functions,
no more irrelevant I/O information are being printed for UPIO_BUS iotypes.
Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Link: https://patch.msgid.link/20260521-tty-upio-v3-7-bf74567994a0@dimonoff.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/serial_core.h | 1 | ||||
| -rw-r--r-- | include/uapi/linux/serial.h | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index 66b1459d53fc..c4cc4f66af4b 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -437,6 +437,7 @@ enum uart_iotype { UPIO_TSI = SERIAL_IO_TSI, /* Tsi108/109 type IO */ UPIO_MEM32BE = SERIAL_IO_MEM32BE, /* 32b big endian */ UPIO_MEM16 = SERIAL_IO_MEM16, /* 16b little endian */ + UPIO_BUS = SERIAL_IO_BUS, /* Serial bus I/O access (ex: SPI, I2C) */ }; struct uart_port { diff --git a/include/uapi/linux/serial.h b/include/uapi/linux/serial.h index de9b4733607e..e6f61538fc28 100644 --- a/include/uapi/linux/serial.h +++ b/include/uapi/linux/serial.h @@ -72,6 +72,7 @@ struct serial_struct { #define SERIAL_IO_TSI 5 #define SERIAL_IO_MEM32BE 6 #define SERIAL_IO_MEM16 7 +#define SERIAL_IO_BUS 8 #define UART_CLEAR_FIFO 0x01 #define UART_USE_FIFO 0x02 |