linux-kernel - [PATCH v3 2/3] arm64: tegra: Add dma-channel-mask in GPCDMA node

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Date:   Tue, 1 Nov 2022 13:57:11 +0530
From:   Akhil R <akhilrajeev@...dia.com>
To:     <ldewangan@...dia.com>, <jonathanh@...dia.com>, <vkoul@...nel.org>,
        <thierry.reding@...il.com>, <p.zabel@...gutronix.de>,
        <dmaengine@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <robh+dt@...nel.org>,
        <devicetree@...r.kernel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <sfr@...b.auug.org.au>
CC:     <akhilrajeev@...dia.com>
Subject: [PATCH v3 2/3] arm64: tegra: Add dma-channel-mask in GPCDMA node

Add dma-channel-mask property in Tegra GPCDMA device tree node.

The property would help to specify the channels to be used in
kernel and reserve few for the firmware. This was previously
achieved by limiting the channel number to 31 in the driver.

Signed-off-by: Akhil R <akhilrajeev@...dia.com>
---
 arch/arm64/boot/dts/nvidia/tegra186.dtsi | 1 +
 arch/arm64/boot/dts/nvidia/tegra194.dtsi | 1 +
 arch/arm64/boot/dts/nvidia/tegra234.dtsi | 1 +
 3 files changed, 3 insertions(+)

diff --git a/arch/arm64/boot/dts/nvidia/tegra186.dtsi b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
index 6602fe421ee8..60a2277d7f6c 100644
--- a/arch/arm64/boot/dts/nvidia/tegra186.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
@@ -112,6 +112,7 @@
 		#dma-cells = <1>;
 		iommus = <&smmu TEGRA186_SID_GPCDMA_0>;
 		dma-coherent;
+		dma-channel-mask = <0xfffffffe>;
 		status = "okay";
 	};
 
diff --git a/arch/arm64/boot/dts/nvidia/tegra194.dtsi b/arch/arm64/boot/dts/nvidia/tegra194.dtsi
index 28740c014f1d..88f60442ab3a 100644
--- a/arch/arm64/boot/dts/nvidia/tegra194.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra194.dtsi
@@ -176,6 +176,7 @@
 			#dma-cells = <1>;
 			iommus = <&smmu TEGRA194_SID_GPCDMA_0>;
 			dma-coherent;
+			dma-channel-mask = <0xfffffffe>;
 			status = "okay";
 		};
 
diff --git a/arch/arm64/boot/dts/nvidia/tegra234.dtsi b/arch/arm64/boot/dts/nvidia/tegra234.dtsi
index 5d7df32fd159..315539b01149 100644
--- a/arch/arm64/boot/dts/nvidia/tegra234.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra234.dtsi
@@ -61,6 +61,7 @@
 				     <GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH>;
 			#dma-cells = <1>;
 			iommus = <&smmu_niso0 TEGRA234_SID_GPCDMA>;
+			dma-channel-mask = <0xfffffffe>;
 			dma-coherent;
 		};
 
-- 
2.17.1