<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/74245>74245</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [mlir:python] Add a mechanism to register upstream dialects from Python
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            mlir
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          hawkinsp
      </td>
    </tr>
</table>

<pre>
    Currently there seem to be two ways to register the upstream dialects in a build of MLIR Python:
a) use `mlirRegisterEverything`, which works, but links in many dialects and transforms that might not be necessary.
b) define a `_site_initialize` module, which works, but requires that you write a custom pybind11 module.

Wouldn't it be nice if one could do neither (a) nor (b), and instead just explicitly register dialects like `arith` with a `ir.Context` from Python, without having write a C++ Python extension to do so?

I'm imagining adding an API along the lines of:

```
arith.register_dialect(context)
```

to the generated code for a dialect, but I don't much mind exactly what the API is, so long as it exists. That appears to be the pattern often used by out-of-tree dialects.

@stellaraccident 
</pre>
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