[RFC PATCH v4 7/9] arm64: dts: rockchip: rk356x: Add the NPU and its IOMMU

From: MidG971 <midgy971@gmail.com>
To: tomeu@tomeuvizoso.net, ogabbay@kernel.org, heiko@sntech.de,
	robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org,
	ulf.hansson@linaro.org
Cc: dri-devel@lists.freedesktop.org,
	linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org,
	iommu@lists.linux.dev, linux-kernel@vger.kernel.org,
	xxm@rock-chips.com, chaoyi.chen@rock-chips.com,
	finley.xiao@rock-chips.com, diederik@cknow-tech.com,
	jonas@kwiboo.se, Midgy BALON <midgy971@gmail.com>
Subject: [RFC PATCH v4 7/9] arm64: dts: rockchip: rk356x: Add the NPU and its IOMMU
Date: Sat, 13 Jun 2026 09:01:14 +0200	[thread overview]
Message-ID: <20260613070116.438906-8-midgy971@gmail.com> (raw)
In-Reply-To: <20260613070116.438906-1-midgy971@gmail.com>

From: Midgy BALON <midgy971@gmail.com>

The RK3568 has an NVDLA-derived NPU at fde40000 with its own IOMMU at
fde4b000. Add both nodes (disabled by default) and the NPU power-domain
child under the PMU power-controller, and point rockchip,pmu at the PMU
syscon that controls the NPU NoC bus-idle.

Besides the SCMI compute clock, assign the CRU CLK_NPU so the NPU AXI
bus clock comes up at 200 MHz rather than the 12 MHz boot default.

The power-domain deliberately carries no pm_qos: qos_npu sits behind the
NPU NoC, which is gated until the NPU is brought up, so a genpd power-off
QoS save would fault reading it.

Signed-off-by: Midgy BALON <midgy971@gmail.com>
---
 arch/arm64/boot/dts/rockchip/rk356x-base.dtsi | 38 +++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi b/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi
index 64bdd8b7754b5..313db59c1aed8 100644
--- a/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi
@@ -512,6 +512,13 @@ power-domain@RK3568_PD_GPU {
 				#power-domain-cells = <0>;
 			};
 
+			pd_npu: power-domain@RK3568_PD_NPU {
+				reg = <RK3568_PD_NPU>;
+				clocks = <&cru ACLK_NPU_PRE>,
+					 <&cru HCLK_NPU_PRE>;
+				#power-domain-cells = <0>;
+			};
+
 			/* These power domains are grouped by VD_LOGIC */
 			power-domain@RK3568_PD_VI {
 				reg = <RK3568_PD_VI>;
@@ -572,6 +579,37 @@ power-domain@RK3568_PD_RKVENC {
 		};
 	};
 
+	rknn_core_0: npu@fde40000 {
+		compatible = "rockchip,rk3568-rknn-core";
+		reg = <0x0 0xfde40000 0x0 0x1000>,
+		      <0x0 0xfde41000 0x0 0x1000>,
+		      <0x0 0xfde43000 0x0 0x1000>;
+		reg-names = "pc", "cna", "core";
+		interrupts = <GIC_SPI 151 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&cru ACLK_NPU>, <&cru HCLK_NPU>,
+			 <&scmi_clk SCMI_CLK_NPU>, <&cru PCLK_NPU_PRE>;
+		clock-names = "aclk", "hclk", "npu", "pclk";
+		assigned-clocks = <&scmi_clk SCMI_CLK_NPU>, <&cru CLK_NPU>;
+		assigned-clock-rates = <200000000>, <600000000>;
+		resets = <&cru SRST_A_NPU>, <&cru SRST_H_NPU>;
+		reset-names = "srst_a", "srst_h";
+		power-domains = <&power RK3568_PD_NPU>;
+		rockchip,pmu = <&pmu>;
+		iommus = <&rknn_mmu_0>;
+		status = "disabled";
+	};
+
+	rknn_mmu_0: iommu@fde4b000 {
+		compatible = "rockchip,iommu";
+		reg = <0x0 0xfde4b000 0x0 0x40>;
+		interrupts = <GIC_SPI 151 IRQ_TYPE_LEVEL_HIGH>;
+		clock-names = "aclk", "iface";
+		clocks = <&cru ACLK_NPU>, <&cru HCLK_NPU>;
+		power-domains = <&power RK3568_PD_NPU>;
+		#iommu-cells = <0>;
+		status = "disabled";
+	};
+
 	gpu: gpu@fde60000 {
 		compatible = "rockchip,rk3568-mali", "arm,mali-bifrost";
 		reg = <0x0 0xfde60000 0x0 0x4000>;
-- 
2.39.5


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