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[ig4] Do not wait until interrupts are enabled at attach stage

Description

[ig4] Do not wait until interrupts are enabled at attach stage

as the driver is fully functional on a cold boot through utilization of
polled mode.

As a side effect, ig4 children probe and attach methods can be called
earlier in the boot sequence, so now it is up to the child drivers
to wait for a kernel initialization completion if it is required.

Details

Provenance
wulfAuthored on
Parents
rS354302: [ig4] Allow enabling of polled mode from iicbus allocation callback
Branches
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