arm64: dts: rockchip: list all CPU supplies on ArmSoM Sige5

List both CPU supply regulators which drive the little and big CPU
clusters, respectively, so that cpufreq can pick them up.

Without this patch the cpufreq governor attempts to raise the big CPU
frequency under high load, while its supply voltage stays at 850000 uV.
This causes system instability and, in my case, random reboots.

With this patch, supply voltages are adjusted in step with frequency
changes from 700000-737000 uV in idle to 950000 uV under full load,
and the system appears to be stable.

While at this, list all CPU supplies for completeness.

Cc: [email protected]
Fixes: 40f742b ("arm64: dts: rockchip: Add rk3576-armsom-sige5 board")
Reviewed-by: Nicolas Frattaroli <[email protected]>
Tested-by: Nicolas Frattaroli <[email protected]>
Signed-off-by: Alexey Charkov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Heiko Stuebner <[email protected]>

Author: alchark

arch/arm64/boot/dts/rockchip/rk3576-armsom-sige5.dts

@@ -211,10 +211,38 @@
 	status = "okay";
 };
 
+&cpu_b0 {
+	cpu-supply = <&vdd_cpu_big_s0>;
+};
+
+&cpu_b1 {
+	cpu-supply = <&vdd_cpu_big_s0>;
+};
+
+&cpu_b2 {
+	cpu-supply = <&vdd_cpu_big_s0>;
+};
+
+&cpu_b3 {
+	cpu-supply = <&vdd_cpu_big_s0>;
+};
+
 &cpu_l0 {
 	cpu-supply = <&vdd_cpu_lit_s0>;
 };
 
+&cpu_l1 {
+	cpu-supply = <&vdd_cpu_lit_s0>;
+};
+
+&cpu_l2 {
+	cpu-supply = <&vdd_cpu_lit_s0>;
+};
+
+&cpu_l3 {
+	cpu-supply = <&vdd_cpu_lit_s0>;
+};
+
 &gmac0 {
 	phy-mode = "rgmii-id";
 	clock_in_out = "output";