bus_generic_detach: Delete children after detaching them

This provides better semantics as a standalone DEVMETHOD for
device_attach as bus drivers should remove child devices they created
as part of

bus_generic_detach: Delete children after detaching them

This provides better semantics as a standalone DEVMETHOD for
device_attach as bus drivers should remove child devices they created
as part of detach cleanup. The implementation calls
bus_detach_children() first to permit child devices an opportunity to
veto the detach operation. If that succeeds, device_delete_children()
is used to delete the child devices.

This requires fixing various drivers that were deleting devices
explicitly (via a device_t pointer cached in the softc) after calling
bus_generic_detach to stop doing that and just rely on
bus_generic_detach to remove child devices.

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D47959

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Replace calls to bus_generic_attach with bus_attach_children

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D47675

vf_i2c: Don't hold a mutex across bus_generic_detach

This was also leaking the lock if bus_generic_detach failed.

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D47221

newbus: globally replace device_add_child(..., -1) with DEVICE_UNIT_ANY

Sponsored by: Netflix

vf_i2c: update I2C controller logic

Update the I2C controller logic to be more consistent with the
newer version of the controller reference manual.
This makes it work better on modern LS/LX platfor

vf_i2c: update I2C controller logic

Update the I2C controller logic to be more consistent with the
newer version of the controller reference manual.
This makes it work better on modern LS/LX platforms and avoids
unnecessary delays. Also fixes a lock leak.

MFC after: 7 days
Tested by: bz (LS1088a FDT), Pierre-Luc Drouin (Honeycomb, ACPI)
Differential Revision: https://reviews.freebsd.org/D44021

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vf_i2c: split up and add ACPI attachments in addition to FDT

Move the code from the arm specific to the iicbus controller directory.
Split up between general logic and bus attachment code.
Add suppo

vf_i2c: split up and add ACPI attachments in addition to FDT

Move the code from the arm specific to the iicbus controller directory.
Split up between general logic and bus attachment code.
Add support for ACPI attachment in addition to FDT.

MFC after: 7 days
Tested by: bz (LS1088a FDT), Pierre-Luc Drouin (Honeycomb, ACPI)
Based on: D24917 by Val Packett (initial early version)
Differential Revision: https://reviews.freebsd.org/D44020

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