linux-kernel - [PATCH v6 0/6] Add RS485 9th bit addressing mode support to DW UART

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Date:   Mon, 13 Jun 2022 10:52:21 +0300
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     linux-serial@...r.kernel.org, Greg KH <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Lukas Wunner <lukas.wunner@...el.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, linux-kernel@...r.kernel.org,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Arnd Bergmann <arnd@...db.de>, linux-api@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: [PATCH v6 0/6] Add RS485 9th bit addressing mode support to DW UART

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@...db.de>
Cc: linux-api@...r.kernel.org
Cc: linux-arch@...r.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