This patchset adds RS-485 9th bit addressing mode support to the DW
UART driver and the necessary serial core bits to handle it. The
addressing mode is configured through ->rs485_config() as was requested
during the review of the earlier versions. The line configuration
related ADDRB is still kept in ktermios->c_cflag to be able to take
account the extra addressing bit while calculating timing, etc. but it
is set/cleared by ->rs485_config().
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: linux-api@xxxxxxxxxxxxxxx
Cc: linux-arch@xxxxxxxxxxxxxxx
v8 -> v9:
- Tweak comments (struct fields info & one callback style correction)
- Add struct layout checks as static_asserts
v7 -> v8:
- Use anonymous union/struct in serial_rs485 to create "v2" of it
- Remove a stray newline change
- Reorder local var declarations
- Put ktermios param before serial_rs485 for rs485_config
v6 -> v7:
- Fixed typos in documentation & comment
- Changes lsr typing from unsigned int to u16
v5 -> v6:
- Reorder remaining patches
- LSR changes are simpler due to helper added by LSR fix series
- Depend on rs485_struct sanitization on catching much of invalid config
- In order to be able to alter ADDRB in termios .c_cflag within
.rs485_config(), take termios_rwsem and pass ktermios to it.
- Moved addressing mode setup entirely into .rs485_config()
- Use ndelay() instead of udelay() (uart_port->frame_time is in nsecs)
Ilpo Järvinen (6):
serial: 8250: make saved LSR larger
serial: 8250: create lsr_save_mask
serial: 8250_lpss: Use 32-bit reads
serial: take termios_rwsem for ->rs485_config() & pass termios as
param
serial: Support for RS-485 multipoint addresses
serial: 8250_dwlib: Support for 9th bit multipoint addressing
Documentation/driver-api/serial/driver.rst | 2 +
.../driver-api/serial/serial-rs485.rst | 26 ++++-
drivers/tty/serial/8250/8250.h | 9 +-
drivers/tty/serial/8250/8250_core.c | 4 +
drivers/tty/serial/8250/8250_dw.c | 2 +-
drivers/tty/serial/8250/8250_dwlib.c | 105 +++++++++++++++++-
drivers/tty/serial/8250/8250_exar.c | 11 +-
drivers/tty/serial/8250/8250_fintek.c | 2 +-
drivers/tty/serial/8250/8250_fsl.c | 2 +-
drivers/tty/serial/8250/8250_ingenic.c | 2 +-
drivers/tty/serial/8250/8250_lpc18xx.c | 2 +-
drivers/tty/serial/8250/8250_lpss.c | 2 +-
drivers/tty/serial/8250/8250_omap.c | 7 +-
drivers/tty/serial/8250/8250_pci.c | 2 +-
drivers/tty/serial/8250/8250_port.c | 20 ++--
drivers/tty/serial/amba-pl011.c | 2 +-
drivers/tty/serial/ar933x_uart.c | 2 +-
drivers/tty/serial/atmel_serial.c | 2 +-
drivers/tty/serial/fsl_lpuart.c | 4 +-
drivers/tty/serial/imx.c | 2 +-
drivers/tty/serial/max310x.c | 2 +-
drivers/tty/serial/mcf.c | 3 +-
drivers/tty/serial/omap-serial.c | 3 +-
drivers/tty/serial/sc16is7xx.c | 2 +-
drivers/tty/serial/serial_core.c | 36 +++++-
drivers/tty/serial/stm32-usart.c | 2 +-
drivers/tty/tty_ioctl.c | 4 +
include/linux/serial_8250.h | 7 +-
include/linux/serial_core.h | 1 +
include/uapi/asm-generic/termbits-common.h | 1 +
include/uapi/linux/serial.h | 20 +++-
31 files changed, 238 insertions(+), 53 deletions(-)
--
2.30.2
