Replace calls to bus_generic_attach with bus_attach_children

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

clk_fixed: quiet by default

We may attach several of these devices, but there is no meaningful
information added to dmesg. For example:

ofwbus0: <Open Firmware Device Tree>
clk_fixed0: <Fixed c

clk_fixed: quiet by default

We may attach several of these devices, but there is no meaningful
information added to dmesg. For example:

ofwbus0: <Open Firmware Device Tree>
clk_fixed0: <Fixed clock> on ofwbus0
clk_fixed1: <Fixed clock> on ofwbus0
clk_fixed2: <Fixed clock> on ofwbus0
clk_fixed3: <Fixed clock> on ofwbus0
clk_fixed4: <Fixed clock> on ofwbus0
clk_fixed5: <Fixed clock> on ofwbus0
clk_fixed6: <Fixed clock> on ofwbus0
clk_fixed7: <Fixed clock> on ofwbus0
clk_fixed8: <Fixed clock> on ofwbus0
clk_fixed9: <Fixed clock> on ofwbus0
clk_fixed10: <Fixed clock> on ofwbus0
clk_fixed11: <Fixed clock> on ofwbus0

To reduce this noise, quiet the devices for by default. For verbose
boot, the message will be emitted.

Reviewed by: manu
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D44266

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clk_fixed: call clkdom_dump() for verbose boot

This is standard practice for clock drivers that register clocks
dynamically. Nothing else uses the CLK_DEBUG macro.

The result is that the name and f

clk_fixed: call clkdom_dump() for verbose boot

This is standard practice for clock drivers that register clocks
dynamically. Nothing else uses the CLK_DEBUG macro.

The result is that the name and frequency of the fixed clock is printed
for a verbose boot, which may aid in debugging.

Reviewed by: manu
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D44265

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clk: Move clock code in dev/clk

We've removed kernel option EXT_RESOURCES almost two years ago.
While it was ok to have some code under a common 'extres' subdirectory
at first, we now have a lot of

clk: Move clock code in dev/clk

We've removed kernel option EXT_RESOURCES almost two years ago.
While it was ok to have some code under a common 'extres' subdirectory
at first, we now have a lot of consumer of it and we made it mandatory
so no need to have it under a cryptic name.

Reviewed by: mhorne
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D43191

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