From: Andre Przywara <andre.przywara@arm.com>
Date: Fri, 6 May 2022 15:05:23 +0100
Subject: dt-bindings: iommu: arm,smmu-v3: make PRI IRQ optional
Git-commit: e4783856a2e8e41c679fd818afc912904d4088ba
Patch-mainline: v5.19-rc1
References: bsc#1205701

The Page Request Interface (PRI) is an optional PCIe feature. As such, a
SMMU would not need to handle it if the PCIe host bridge or the SMMU
itself do not implement it. Also an SMMU could be connected to a platform
device, without any PRI functionality whatsoever.
In all cases there would be no SMMU PRI queue interrupt to be wired up
to an interrupt controller.
At the moment, with the "eventq,gerror,priq,cmdq-sync" order, we
would need to sacrifice the command queue sync interrupt as well, which
might not be desired.

Relax the binding to allow specifying certain useful combinations of
wired interrupts, for instance just the "gerror" interrupt, or omitting
both "pri" and "cmdq-sync".

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220506140533.3566431-2-andre.przywara@arm.com

Acked-by: Joerg Roedel <jroedel@suse.de>
---
 Documentation/devicetree/bindings/iommu/arm,smmu-v3.yaml | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.yaml b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.yaml
index e87bfbcc6913..c57a53d87e4e 100644
--- a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.yaml
+++ b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.yaml
@@ -37,12 +37,18 @@ properties:
           hardware supports just a single, combined interrupt line.
           If provided, then the combined interrupt will be used in preference to
           any others.
-      - minItems: 2
+      - minItems: 1
         items:
-          - const: eventq     # Event Queue not empty
-          - const: gerror     # Global Error activated
-          - const: priq       # PRI Queue not empty
-          - const: cmdq-sync  # CMD_SYNC complete
+          - enum:
+              - eventq     # Event Queue not empty
+              - gerror     # Global Error activated
+          - const: gerror
+          - enum:
+              - cmdq-sync  # CMD_SYNC complete
+              - priq       # PRI Queue not empty
+          - enum:
+              - cmdq-sync
+              - priq
 
   '#iommu-cells':
     const: 1