061b38cdcc
"pin_list" allows to specify child pins as a list of pin numbers. Existing hint "pins" serves the same purpose but with a 32-bit wide bit mask. One problem with that is that a controller can have more than 32 pins. One example is amdgpio. Also, a list of numbers is a little bit more human friendly than a matching bit mask. As a side note, it seems that in FDT pins are typically specified by their numbers as well. This commit also adds accessors for instance variables (IVARs) that define the child pins. My primary goal is to allow a child to be configured programmatically rather than via hints (assuming that FDT is not supported on a platform). Also, while a child should not care about specific pin numbers that are allocated to it, it could be interested in how many were actually assigned to it. While there, I removed "flags" instance variable. It was unused. Reviewed by: mizhka MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D20459
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