+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 >
