From: Daniel J Blueman <daniel@quora.org>
To: "Bryan O'Donoghue" <bod@kernel.org>,
Vikash Garodia <vikash.garodia@oss.qualcomm.com>,
Dikshita Agarwal <dikshita.agarwal@oss.qualcomm.com>,
Abhinav Kumar <abhinav.kumar@linux.dev>,
Bjorn Andersson <andersson@kernel.org>,
Konrad Dybcio <konradybcio@kernel.org>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
linux-arm-msm@vger.kernel.org, linux-media@vger.kernel.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
Daniel J Blueman <daniel@quora.org>
Subject: [PATCH 1/2] dt-bindings: media: qcom,sm8550-iris: Allow IOVA reservation memory-region
Date: Mon, 1 Jun 2026 12:13:33 +0800 [thread overview]
Message-ID: <20260601041336.9497-1-daniel@quora.org> (raw)
In addition to the firmware-loaded codec carveout, some Iris platforms
need to declare an IOMMU IOVA reservation (a reserved-memory node with
iommu-addresses) to keep DMA away from IOVA ranges that earlier
firmware stages have already mapped through the SMMU.
Permit a second memory-region phandle for this purpose, and describe
the meaning of each entry so the ordering is unambiguous.
Signed-off-by: Daniel J Blueman <daniel@quora.org>
---
Documentation/devicetree/bindings/media/qcom,sm8550-iris.yaml | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/media/qcom,sm8550-iris.yaml b/Documentation/devicetree/bindings/media/qcom,sm8550-iris.yaml
index 9c4b760508b5..6359e4953d42 100644
--- a/Documentation/devicetree/bindings/media/qcom,sm8550-iris.yaml
+++ b/Documentation/devicetree/bindings/media/qcom,sm8550-iris.yaml
@@ -80,7 +80,11 @@ properties:
dma-coherent: true
memory-region:
- maxItems: 1
+ minItems: 1
+ maxItems: 2
+ items:
+ - description: Firmware-loaded codec carveout
+ - description: IOMMU IOVA reservation region
operating-points-v2: true
--
2.53.0
next reply other threads:[~2026-06-01 4:14 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-01 4:13 Daniel J Blueman [this message]
2026-06-01 4:13 ` [PATCH 2/2] arm64: dts: qcom: hamoa: Reserve low IOVA range for Iris Daniel J Blueman
2026-06-02 10:26 ` Bryan O'Donoghue
2026-06-02 15:03 ` Val Packett
2026-06-02 15:33 ` Bryan O'Donoghue
2026-06-02 15:35 ` Daniel J Blueman
2026-06-04 6:38 ` Vikash Garodia
2026-06-08 3:48 ` Val Packett
2026-06-08 4:17 ` Xilin Wu
2026-06-08 13:36 ` Bryan O'Donoghue
2026-06-09 13:01 ` Bryan O'Donoghue
2026-07-10 10:51 ` Bryan O'Donoghue
2026-06-10 1:14 ` Daniel J Blueman
2026-06-01 4:27 ` [PATCH 1/2] dt-bindings: media: qcom,sm8550-iris: Allow IOVA reservation memory-region sashiko-bot
2026-06-01 17:45 ` Rob Herring (Arm)
2026-06-04 19:15 ` Frank Li
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