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Subject[PATCH v6 0/6] Add RS485 9th bit addressing mode support to DW UART
Date
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().

PLEASE CHECK that the serial_rs485 .padding change looks OK (mainly
that it won't add hole under some odd condition which would alter
serial_rs485's sizeof)!

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-api@vger.kernel.org
Cc: linux-arch@vger.kernel.org

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 | 5 +-
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 | 8 +-
drivers/tty/serial/8250/8250_pci.c | 2 +-
drivers/tty/serial/8250/8250_port.c | 18 +--
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 | 26 ++++-
drivers/tty/serial/stm32-usart.c | 2 +-
drivers/tty/tty_ioctl.c | 4 +
include/linux/serial_8250.h | 7 +-
include/linux/serial_core.h | 3 +-
include/uapi/asm-generic/termbits-common.h | 1 +
include/uapi/linux/serial.h | 12 +-
31 files changed, 220 insertions(+), 50 deletions(-)

--
2.30.2

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