linux-kernel - [PATCH v2 3/8] dt-bindings: media: mediatek,jpeg: Relax IOMMU max item count

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Message-ID: <20241001113052.3124869-4-fshao@chromium.org>
Date: Tue,  1 Oct 2024 19:27:21 +0800
From: Fei Shao <fshao@...omium.org>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Fei Shao <fshao@...omium.org>,
	Bin Liu <bin.liu@...iatek.com>,
	Conor Dooley <conor+dt@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Xia Jiang <xia.jiang@...iatek.com>,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org,
	linux-mediatek@...ts.infradead.org
Subject: [PATCH v2 3/8] dt-bindings: media: mediatek,jpeg: Relax IOMMU max item count

On MediaTek platforms with Multimedia MMU (M4U), a multimedia hardware
can be assigned with a local arbiter (LARB) which has a maximum of 32
ports for MediaTek's IOMMU infrastructure. That means there can be at
most 32 items in the iommus property in theory.

Instead of relaxing the max item count every time a newly introduced
device tree hits the limit, bump the number to 32 as an one-time effort.

On the other hand, all existing and foreseeable JPEG decoder nodes at
this point have at least 2 IOMMUs, so set minItems to 2 accordingly.

Signed-off-by: Fei Shao <fshao@...omium.org>
---
It's not in the upstream tree yet, but the upcoming MT8188 DT will have
6 IOMMUs in its JPEG decoder. This patch is to pave the way for that.

Changes in v2:
New patch.

 .../devicetree/bindings/media/mediatek-jpeg-decoder.yaml       | 3 ++-
 .../devicetree/bindings/media/mediatek-jpeg-encoder.yaml       | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/media/mediatek-jpeg-decoder.yaml b/Documentation/devicetree/bindings/media/mediatek-jpeg-decoder.yaml
index cfabf360f278..a4aacd3eb189 100644
--- a/Documentation/devicetree/bindings/media/mediatek-jpeg-decoder.yaml
+++ b/Documentation/devicetree/bindings/media/mediatek-jpeg-decoder.yaml
@@ -44,7 +44,8 @@ properties:
     maxItems: 1
 
   iommus:
-    maxItems: 2
+    minItems: 2
+    maxItems: 32
     description: |
       Points to the respective IOMMU block with master port as argument, see
       Documentation/devicetree/bindings/iommu/mediatek,iommu.yaml for details.
diff --git a/Documentation/devicetree/bindings/media/mediatek-jpeg-encoder.yaml b/Documentation/devicetree/bindings/media/mediatek-jpeg-encoder.yaml
index 83c020a673d6..5b15f8977f67 100644
--- a/Documentation/devicetree/bindings/media/mediatek-jpeg-encoder.yaml
+++ b/Documentation/devicetree/bindings/media/mediatek-jpeg-encoder.yaml
@@ -39,7 +39,7 @@ properties:
 
   iommus:
     minItems: 2
-    maxItems: 4
+    maxItems: 32
     description: |
       Points to the respective IOMMU block with master port as argument, see
       Documentation/devicetree/bindings/iommu/mediatek,iommu.yaml for details.
-- 
2.46.1.824.gd892dcdcdd-goog