From 7de0c114f06744444853b13e4faf231297370cc4 Mon Sep 17 00:00:00 2001
From: Akhil R <akhilrajeev@nvidia.com>
Date: Tue, 31 Mar 2026 15:53:03 +0530
Subject: [PATCH] arm64: tegra: Enable GPCDMA in Tegra264 and add iommu-map

Enable GPCDMA in Tegra264 and add the iommu-map property so that each
channel uses a separate stream ID and gets its own IOMMU domain for
memory.

Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
---
 arch/arm64/boot/dts/nvidia/tegra264-p3834.dtsi | 4 ++++
 arch/arm64/boot/dts/nvidia/tegra264.dtsi       | 1 +
 2 files changed, 5 insertions(+)

diff --git a/arch/arm64/boot/dts/nvidia/tegra264-p3834.dtsi b/arch/arm64/boot/dts/nvidia/tegra264-p3834.dtsi
index 7e2c3e66c2ab..58cd81bc33d7 100644
--- a/arch/arm64/boot/dts/nvidia/tegra264-p3834.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra264-p3834.dtsi
@@ -9,6 +9,10 @@ aliases {
 	};
 
 	bus@0 {
+		dma-controller@8400000 {
+			status = "okay";
+		};
+
 		serial@c4e0000 {
 			status = "okay";
 		};
diff --git a/arch/arm64/boot/dts/nvidia/tegra264.dtsi b/arch/arm64/boot/dts/nvidia/tegra264.dtsi
index 2d2cb1a3d95c..a8d534435a9b 100644
--- a/arch/arm64/boot/dts/nvidia/tegra264.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra264.dtsi
@@ -3244,6 +3244,7 @@ gpcdma: dma-controller@8400000 {
 				     <GIC_SPI 615 IRQ_TYPE_LEVEL_HIGH>;
 			#dma-cells = <1>;
 			iommus = <&smmu1 0x00000800>;
+			iommu-map = <1 &smmu1 0x801 31>;
 			dma-coherent;
 			dma-channel-mask = <0xfffffffe>;
 			status = "disabled";