[dpu_tty]: Add a DPU TTY console utility

[wenchungw]

• Add dpu_tty.py
• Add dpu_tty.py to scripts

Signed-off-by: Wenchung Wang [email protected]

What I did

Add DPU TTY console utility.

How I did it

• Read platform.json to retrieve TTY settings in DPUS section. Set up TTY console according to TTY device name and baud rate.
• Also provide options to overwrite default TTY device and baud rate.

"DPUS": {
    "dpu0": {
        "serial-console": {
            "device": "ttyS4",
            "baud-rate": "115200"
        }
    },
    "dpu1": {
        "serial-console": {
            "device": "ttyS5",
            "baud-rate": "115200"
        }
    }
},

How to verify it

Run the utility on a smart switch that provides DPU UART console via ttyS device. The test plan is at https://github.com/sonic-net/sonic-mgmt/pull/12701/files section 1.4.

Previous command output (if the output of a command-line utility has changed)

N/A

New command output (if the output of a command-line utility has changed)

N/A

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: wenchungw / name: Wenchung Wang (9e3b18488e95f9450ad5b51a1bb524ee6d8c28d6, daec93fc36209863576dc2db841089f7e2cd3609, a7248496955f4ad537b16e84ecff36578d4b3f76, bfec7a9a28a38540eba0046595d95d2e22c80382, d2398bcf0b5ef4bbe5ffcf281ede7d9d4bae06e8, c993bfb3097ca96023b3abe38a80d1684e0517f7, a40adfce28a07d74549dba9b83b8753246cb6043, 31840f35c4c2578f42cfb6775c817b5be90bac64)

[wenchungw]

@wenchungw could you update this document to explain the new CLI being proposed?

https://github.com/sonic-net/sonic-utilities/blob/master/doc/Command-Reference.md

Please add a new section "Console"

Added.

[wenchungw]

As commented. Please also cover the application with the tests

Added a test log.

[prgeor]

@oleksandrivantsiv please review/approve