[RFC v3 16/18] riscv: dts: thead: Introduce power domain nodes with aon firmware

[Michal Wilczynski]

The DRM Imagination GPU requires a power-domain driver. In the T-HEAD
TH1520 SoC implements power management capabilities through the E902
core, which can be communicated with through the mailbox, using firmware
protocol.

Add AON node, which servers as a power-domain controller.

Signed-off-by: Michal Wilczynski <m.wilczynski at samsung.com>
---
 arch/riscv/boot/dts/thead/th1520.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/riscv/boot/dts/thead/th1520.dtsi b/arch/riscv/boot/dts/thead/th1520.dtsi
index d4cba0713cab..d6af27cbb786 100644
--- a/arch/riscv/boot/dts/thead/th1520.dtsi
+++ b/arch/riscv/boot/dts/thead/th1520.dtsi
@@ -6,6 +6,7 @@
 
 #include <dt-bindings/interrupt-controller/irq.h>
 #include <dt-bindings/clock/thead,th1520-clk-ap.h>
+#include <dt-bindings/firmware/thead,th1520-aon.h>
 
 / {
 	compatible = "thead,th1520";
@@ -229,6 +230,13 @@ stmmac_axi_config: stmmac-axi-config {
 		snps,blen = <0 0 64 32 0 0 0>;
 	};
 
+	aon: aon {
+		compatible = "thead,th1520-aon";
+		mboxes = <&mbox_910t 1>;
+		mbox-names = "aon";
+		#power-domain-cells = <1>;
+	};
+
 	soc {
 		compatible = "simple-bus";
 		interrupt-parent = <&plic>;
-- 
2.34.1