linux-kernel - [PATCH v2 1/4] arm64: dts: rockchip: list all CPU supplies on ArmSoM Sige5

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Message-Id: <20250614-sige5-updates-v2-1-3bb31b02623c@gmail.com>
Date: Sat, 14 Jun 2025 22:14:33 +0400
From: Alexey Charkov <alchark@...il.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>, 
 Detlev Casanova <detlev.casanova@...labora.com>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Alexey Charkov <alchark@...il.com>, stable@...r.kernel.org, 
 Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Subject: [PATCH v2 1/4] 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: stable@...r.kernel.org
Fixes: 40f742b07ab2 ("arm64: dts: rockchip: Add rk3576-armsom-sige5 board")
Reviewed-by: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Tested-by: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Signed-off-by: Alexey Charkov <alchark@...il.com>
---
 .../boot/dts/rockchip/rk3576-armsom-sige5.dts      | 28 ++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3576-armsom-sige5.dts b/arch/arm64/boot/dts/rockchip/rk3576-armsom-sige5.dts
index b09e789c75c47fec7cf7e9810ab0dcca32d9404a..801b40fea4e8808c3f889ddd3ed3aa875a377567 100644
--- a/arch/arm64/boot/dts/rockchip/rk3576-armsom-sige5.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3576-armsom-sige5.dts
@@ -211,10 +211,38 @@ &combphy0_ps {
 	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";

-- 
2.49.0