K 10
svn:author
V 4
manu
K 8
svn:date
V 27
2020-12-17T17:11:14.474017Z
K 7
svn:log
V 417
Add IRQ resource to SPIBUS

Add capability to SPIBUS to have child device with IRQ.
For example many ADC chip have a dedicated pin to signal "data ready"
and the host can just wait for a interrupt to go out and read the result.

It is the same code as in R282674 and R282702 for IICBUS by Michal Meloun

Submitted by:	Oskar Holmund <oskar.holmlund@ohdata.se>
Differential Revision:	https://reviews.freebsd.org/D27396

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