Add yet another variant of Apple's interrupt controller. This one might
to stick for more SoC variants than their predecessors. According to
Apple's device trees it is used on all SoCs since the M3 (t8122) up to
M5 (t8142). This information is not 100% reliable since macOS uses
different kernel builds for each SoC variant.
As far as the functionality implemented in the Linux driver it is almost
identical to AICv2. The only noticeable difference is an increased
IRQ_CFG offset.
AICv3 uses the same device tree bindings as AICv2 so add its compatible
to the existing apple,aic2.yaml.
Apple's device tree added many MMIO offsets as properties for the
"aic,3" node. The offsets are the same for all released SoCs with AICv3
so the Linux driver continues to use hard coded offsets.
Compatible strings for AICv3 will be SoC specific like
"apple,t8122-aic3" so a potential future SoC with different offsets
would use a new base compatible string for which the driver uses
different MMIO offsets.
While the offsets are the same on M4 and later SoCs access to
implementation defined system registers will require different
compatible strings.

Signed-off-by: Janne Grunau <j@jannau.net>
---
Changes in v3:
- sort aic v2 compatible list alphabetically in dt-bindings
- drop mostly duplicate t8122-aic3 example from dt-bindings
- rebase onto v7.0-rc1
- Link to v2: https://lore.kernel.org/r/20260128-irq-apple-aic3-v2-0-b4bc8e16c997@jannau.net (local)

Changes in v2:
- allow single "apple,t8122-aic3" compatible in the bindings
- drop leftover #include <linux/of.h> as it's not justified by the
  contents
- comment and white space style fixes
- sort cases by version in switch statement
- Add Sven's Rb:
- Link to v1: https://lore.kernel.org/r/20260125-irq-apple-aic3-v1-0-a2afe66a6ab9@jannau.net (local)

---
Janne Grunau (2):
      dt-bindings: interrupt-controller: apple,aic2: Add AICv3
      irqchip/apple-aic: Add support for "apple,t8122-aic3"

 .../bindings/interrupt-controller/apple,aic2.yaml  | 30 +++++++++++++++-------
 drivers/irqchip/irq-apple-aic.c                    | 24 ++++++++++++++---
 2 files changed, 42 insertions(+), 12 deletions(-)
---
base-commit: 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f
change-id: 20260119-irq-apple-aic3-0314f6aa2a2a

Best regards,
-- 
Janne Grunau [off-list ref]