Re: [PATCH 0/5] tty: serial: uartlite: Disable changing fixed parameters

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+Shubhrajyoti

On 7/24/21 12:31 AM, Sean Anderson wrote:
> The uartlite device is a "soft" device and certain parameters (such as
> data bits, parity, and baud) are configured at synthesis time, and
> cannot be discovered at runtime. Fortunately, bindings for this device
> typically include some of these parameters (especially baud rate).
> Instead of silently letting Linux's termios drift away from what the
> hardware is actually doing, make the termios reflect the hardware, and
> prevent them from being changed. With this series applied, the user
> recieves an error message the first time they try and change these
> termios:
> 
>     # stty parity
>     [    7.221696] uartlite 84000000.serial: only 'n' parity supported
>     [    7.222139] uartlite 84000000.serial: only 8 data bits supported
>     stty: standard input: cannot perform all requested operations
> 
> In addition, the configured baud/parity/bits/etc. are exposed through
> the standard termios ioctls, instead of using the default termios for
> unconfigured ttys.
> 
> 
> Sean Anderson (5):
>   dt-bindings: serial: uartlite: Convert to json-schema
>   dt-bindings: serial: uartlite: Add properties for synthesis-time
>     parameters
>   sh: j2: Update uartlite binding with data and parity properties
>   tty: serial: uartlite: Initialize termios with fixed synthesis
>     parameters
>   tty: serial: uartlite: Prevent changing fixed parameters
> 
>  .../bindings/serial/xlnx,opb-uartlite.txt     |  23 ----
>  .../bindings/serial/xlnx,opb-uartlite.yaml    |  92 ++++++++++++++
>  arch/sh/boot/dts/j2_mimas_v2.dts              |   2 +
>  drivers/tty/serial/uartlite.c                 | 118 ++++++++++++++++--
>  4 files changed, 203 insertions(+), 32 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/serial/xlnx,opb-uartlite.txt
>  create mode 100644 Documentation/devicetree/bindings/serial/xlnx,opb-uartlite.yaml
> 



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