Initialize the 'enabled' variable before using it.
This fixes the following compilation warning:
"warning: 'enabled' may be used uninitialized [-Wmaybe-uninitialized]"
issued when compiling with `CONFIG_DEBUG` enabled.
Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>
Tested-by: Daniel Baluta <daniel.baluta@nxp.com>
Add support for PM. The strategy is as follows:
1) For level 1 interrupts: don't care, these don't
require the PM domain of irqsteer to be turned on
since they are, well, direct.
2) For level 2 interrupts: use the reference count
of the dispatchers.
Upon doing a get() on a dispatcher with its reference count
set to 0, before enabling the IRQ (meaning accessing the
reg. space) increment the reference count of the irqstr device
(which will result in the PM domain being enabled if 0).
Upon doin a put() on a dispatcher with its reference count
set to 1, after disabling the IRQ (meaning accessing the
reg. space) decrement the reference count of the irqstr device
(which will result in the PM domain being disabled if 0).
In summary, the PM domain of the device will be enabled if
at least one dispatcher is in use. On the other hand, the
PM domain of the device will be disabled if there's no
dispatchers in use (assuming there's no other dependencies).
Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>
Currently, all dispatcher interrupts are enabled during
the driver init() function, which will cause a bus fault
unless the PM domain associated with irqsteer is powered on.
Since PM will be done during irq_enable()/irq_disable(),
add support for dynamically enabling/disabling dispatchers.
This way, the reg. space of the dispatchers will be accessed
when the PM domain is powered on.
Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>
Currently, shared interrupts pose a big problem because
irq_disable() doesn't keep track of the number of clients
using that interrupt line. As such, add a reference count
mechanism which will stop the interrupt from being disabled
if there's still clients using it.
Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>
This gets rid of the z_ prefix.
Note that z_xt_*() are being used by the HAL so they cannot be
renamed.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This commit introduces a new interrupt controller driver used
for NXP's IRQ_STEER IP.
Apart from introducing the driver itself, this commit contains
the following changes:
1) Switch i.MX8MP to using the XTENSA core interrupt
controller instead of the dummy irqsteer one.
* this is required because the binding for the
irqsteer driver is no longer a dummy one
(since it's being used by the irqsteer driver).
As such, to avoid having problems, switch to
using another dummy binding.
2) Modify the irqsteer dummy binding such that it
serves the IRQ_STEER driver's needs.
Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>
Laurentiu Mihalcea