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Allow child classes of simplebus to call attach directly
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Authored by andrew on Aug 3 2020, 12:03 PM.
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Summary

Reduce code duplication when a bus is subclassed from simplebus by allowing
them to call simplebus_attach directly. This is useful when the child bus
will just implement the same calls.

As not all children will expect to have a ranges property, e.g. the
Raspberry Pi firmware, allow this property to be missing.

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rS FreeBSD src repository - subversion
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