[PATCH v8 12/12] arm64: dts: rockchip: rk3576-rock-4d: enable NPU

Enable rknn_core_0 and its IOMMU on the Radxa ROCK 4D, and hand
vdd_npu_s0 to the NPU power domain as its domain-supply, so the rail is
switched by the domain that gates the block.

Measured on a ROCK 4D with this in place. The rail's regulator debugfs
reports open_count 1, so the domain is the consumer that took it. A
sampler running beside an inference caught use_count at 1, and three
reads at rest report use_count 0 with the rail disabled, so it follows
the domain rather than staying on. Over the same run the genpd
active_time of all four NPU domains rises by roughly 60ms per inference,
and the inferences either side of that are 128 of 128 channels against
the CPU reference.

rknn_core_0 keeps npu-supply on the same rail, which the binding
requires. Only rknn_core_0 is enabled: the driver binds one core per
node and the second core is left to whoever can test it.

Signed-off-by: Jiaxing Hu <redacted>
---
 arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts b/arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts
index 272af1012..79e039bee 100644
--- a/arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts

@@ -722,6 +722,10 @@ &pcie0 {
 	status = "okay";
 };
 
+&pd_npu {
+	domain-supply = <&vdd_npu_s0>;
+};
+
 &pinctrl {
 	hdmi {
 		hdmi_tx_on_h: hdmi-tx-on-h {

@@ -779,6 +783,15 @@ wifi_en_h: wifi-en-h {
 	};
 };
 
+&rknn_core_0 {
+	npu-supply = <&vdd_npu_s0>;
+	status = "okay";
+};
+
+&rknn_mmu_0 {
+	status = "okay";
+};
+
 &sai6 {
 	status = "okay";
 };

-- 
2.43.0