[RFC PATCH v4 8/9] arm64: dts: rockchip: rk3568-rock-3b: Enable the NPU

[MidG971 <midgy971@gmail.com>]

From: Midgy BALON <midgy971@gmail.com>

Enable the NPU and its IOMMU on ROCK 3B and wire vdd_npu as the NPU
power domain's domain-supply, so genpd brings the rail up and down with
the domain (the domain is marked need_regulator). The PVTPLL compute
clock is brought up later by the driver.

The rail is no longer kept always-on, so pin it to 1000 mV (the NPU's
1 GHz operating voltage; the driver runs a fixed compute rate with no
devfreq voltage scaling) and mark it boot-on, so it is up before the
power domain de-idles the NPU NoC at power-on.

Signed-off-by: Midgy BALON <midgy971@gmail.com>
---
 .../arm64/boot/dts/rockchip/rk3568-rock-3b.dts | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3568-rock-3b.dts b/arch/arm64/boot/dts/rockchip/rk3568-rock-3b.dts
index 69001e453732e..d3f9776c2bdc3 100644
--- a/arch/arm64/boot/dts/rockchip/rk3568-rock-3b.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3568-rock-3b.dts
@@ -330,9 +330,10 @@ regulator-state-mem {
 
 			vdd_npu: DCDC_REG4 {
 				regulator-name = "vdd_npu";
+				regulator-boot-on;
 				regulator-initial-mode = <0x2>;
-				regulator-min-microvolt = <500000>;
-				regulator-max-microvolt = <1350000>;
+				regulator-min-microvolt = <1000000>;
+				regulator-max-microvolt = <1000000>;
 				regulator-ramp-delay = <6001>;
 
 				regulator-state-mem {
@@ -787,3 +788,16 @@ vp0_out_hdmi: endpoint@ROCKCHIP_VOP2_EP_HDMI0 {
 		remote-endpoint = <&hdmi_in_vp0>;
 	};
 };
+
+&pd_npu {
+	domain-supply = <&vdd_npu>;
+};
+
+&rknn_core_0 {
+	npu-supply = <&vdd_npu>;
+	status = "okay";
+};
+
+&rknn_mmu_0 {
+	status = "okay";
+};
-- 
2.39.5