ENH: TimedeltaArray add/sub with non-nano
- [ ] closes #xxxx (Replace xxxx with the Github issue number)
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- [ ] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
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- [ ] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

```
mypy.....................................................................Failed
- hook id: mypy
- exit code: 1

pandas/core/arrays/datetimelike.py:1294: error: "DatetimeLikeArrayMixin" has no attribute "_reso"  [attr-defined]
Found 1 error in 1 file (checked 1394 source files)
``` Yes

On Fri, Aug 26, 2022 at 4:16 PM Matthew Roeschke ***@***.***>
wrote:

> ***@***.**** commented on this pull request.
> ------------------------------
>
> In pandas/core/arrays/timedeltas.py
> <https://github.com/pandas-dev/pandas/pull/48261#discussion_r956494005>:
>
> >          if self.freq is not None:
> -            return type(self)(-self._ndarray, freq=-self.freq)
> -        return type(self)(-self._ndarray)
> +            freq = -self.freq
>
> Do we have a test for this case?
>
> —
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