On Tue, 26 Dec 2023 12:21:22 -0700, Mark Hasemeyer wrote:

Add wake capability information to the IRQ resource. Wake capability is
assumed based on conventions provided in the devicetree wakeup-source
binding documentation. An interrupt is considered wake capable if the
following are true:
1. A wakeup-source property exits in the same device node as the
   interrupt.
2. The IRQ is marked as dedicated by setting its interrupt-name to
   "wakeup".

The wakeup-source documentation states that dedicated interrupts can use
device specific interrupt names and device drivers are still welcome to
use their own naming schemes. This API is provided as a helper if one is
willing to conform to the above conventions.

The ACPI subsystems already provides similar APIs that allow one to
query the wake capability of an IRQ. This brings closer feature parity
to the devicetree.

Signed-off-by: Mark Hasemeyer <redacted>
---

Changes in v3:
-Use DEFINE_RES_IRQ_NAMED_FLAGS macro

Changes in v2:
-Update logic to return true only if wakeup-source property and
 "wakeup" interrupt-name are defined
-irq->IRQ, api->API

 drivers/of/irq.c | 39 +++++++++++++++++++++++++++++++++++----
 1 file changed, 35 insertions(+), 4 deletions(-)

Reviewed-by: Rob Herring <robh@kernel.org>