From ea08eeccae9297f7aabd2ef7f0c2517ac4549acc Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:18:26 +0000
Subject: [PATCH] write in 30M

---
 kernel/Documentation/devicetree/bindings/iommu/iommu.txt |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/kernel/Documentation/devicetree/bindings/iommu/iommu.txt b/kernel/Documentation/devicetree/bindings/iommu/iommu.txt
index 5a8b462..3c36334 100644
--- a/kernel/Documentation/devicetree/bindings/iommu/iommu.txt
+++ b/kernel/Documentation/devicetree/bindings/iommu/iommu.txt
@@ -86,6 +86,12 @@
 disable the IOMMU's device tree node in the first place because it would
 prevent any driver from properly setting up the translations.
 
+Optional properties:
+--------------------
+- pasid-num-bits: Some masters support multiple address spaces for DMA, by
+  tagging DMA transactions with an address space identifier. By default,
+  this is 0, which means that the device only has one address space.
+
 
 Notes:
 ======

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