Add a bus_probe_nomatch() method for gpiobus/ofw_gpiobus.

This prints a warning when your system have a hinted child or a FDT child
node for which you don't have a matching driver:

gpiobus0: <unkno

Add a bus_probe_nomatch() method for gpiobus/ofw_gpiobus.

This prints a warning when your system have a hinted child or a FDT child
node for which you don't have a matching driver:

gpiobus0: <unknown device> at pin(s) 24 irq 24

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Merge from head

Merge ^/head r279313 through r279595.

Merge r279515 through r279554 (mainly to get r279554 in this branch).

Move duplicate code to a new public function.

This new function can be used by other drivers to reserve the use of GPIO
pins.

Anyway, the use of ofw_gpiobus_parse_gpios() is preferred when possible

Move duplicate code to a new public function.

This new function can be used by other drivers to reserve the use of GPIO
pins.

Anyway, the use of ofw_gpiobus_parse_gpios() is preferred when possible.

Requested by: Michal Meloun

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Merge r278538 through r279514.

Rename and move gpiobus_alloc_ivars() and gpiobus_free_ivars() so they can
be used on non FDT systems.

This prevents access to uninitialized memory on drivers that try to access
pin flags on non FDT

Rename and move gpiobus_alloc_ivars() and gpiobus_free_ivars() so they can
be used on non FDT systems.

This prevents access to uninitialized memory on drivers that try to access
pin flags on non FDT systems.

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Merge from HEAD

Merge ^/head r278005 through r278109.

Register the GPIO controller device reference on xref table for FDT systems.

Merge ^/head r277975 through r277998.

Implement GPIO_GET_BUS() method for all GPIO drivers.

Add helper routines to deal with attach and detach of gpiobus and gpioc
devices that are common to all drivers.

Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation

Sync to HEAD@r274766

Merge from head@274682

Moves all the duplicate code to a single function.

Verify for invalid modes and unwanted flags before pass the new flags to
driver.

Fix gpiobus_child_location_str() to return a real string with the mapped
pins.

Make gpiobus_print_pins() static again.

Add basic interrupt management code to gpiobus and ofw_gpiobus.

This is the general support to allow the use of GPIO pins as interrupt
sources for direct gpiobus children.

The use of GPIO pins as g

Add basic interrupt management code to gpiobus and ofw_gpiobus.

This is the general support to allow the use of GPIO pins as interrupt
sources for direct gpiobus children.

The use of GPIO pins as generic interrupt sources (for an ethernet driver
for example) will only be possible when arm/intrng is complete. Then, most
of this code will need to be rewritten, but it works for now, is better
than what we have and will allow further developments.

Tested on: ar71xx (RSPRO), am335x (BBB), bcm2835 (Raspberry pi)
Differential Revision: https://reviews.freebsd.org/D999
Reviewed by: rpaulo

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Sync to HEAD@r274095.

Fix the gpiobus locking by using a more sane model where it isn't necessary
hold the gpiobus lock between the gpio calls.

gpiobus_acquire_lock() now accepts a third parameter which tells gpiobus
wha

Fix the gpiobus locking by using a more sane model where it isn't necessary
hold the gpiobus lock between the gpio calls.

gpiobus_acquire_lock() now accepts a third parameter which tells gpiobus
what to do when the bus is already busy.

When GPIOBUS_WAIT wait is used, the calling thread will be put to sleep
until the bus became free.

With GPIOBUS_DONTWAIT the calling thread will receive EWOULDBLOCK right
away and then it can act upon.

This fixes the gpioiic(4) locking issues that arises when doing multiple
concurrent access on the bus.

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Move the duplicated code to a single function.

No functional changes.

MFC @ r266724

An SVM update will follow this.

IFC @266473

Merge from head