[RFC PATCH v1 13/14] riscv: dts: Introduce power domain node with simple-bus compatible

[Michal Wilczynski]

The DRM Imagination GPU requires a power-domain driver, but the driver
for "thead,th1520-aon" is not yet available. To ensure that the 'aon'
node and its child 'pd' node are properly recognized and probed by the
kernel, add "simple-bus" to the compatible property of the 'aon' node.

This change allows the kernel to treat the 'aon' node as a simple bus,
enabling the child nodes to be probed and initialized independently. It
ensures that the power domain can be managed appropriately until the
specific AON driver is developed.

This commit introduces some errors while running dtbs_check, as the aon
doesn't have the dt-bindings yet.

Signed-off-by: Michal Wilczynski <m.wilczynski at samsung.com>
---
 arch/riscv/boot/dts/thead/th1520.dtsi | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/riscv/boot/dts/thead/th1520.dtsi b/arch/riscv/boot/dts/thead/th1520.dtsi
index 39d39059160d..58f93ad3eb6e 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.h>
+#include <dt-bindings/power/thead,th1520-power.h>
 
 / {
 	compatible = "thead,th1520";
@@ -229,6 +230,16 @@ stmmac_axi_config: stmmac-axi-config {
 		snps,blen = <0 0 64 32 0 0 0>;
 	};
 
+	aon {
+		compatible = "thead,th1520-aon", "simple-bus";
+
+		pd: power-domain {
+			compatible = "thead,th1520-pd";
+			thead,vosys-regmap = <&vosys_reg>;
+			#power-domain-cells = <1>;
+		};
+	};
+
 	soc {
 		compatible = "simple-bus";
 		interrupt-parent = <&plic>;
-- 
2.34.1