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arm64: dts: exynos850: Add syscon-poweroff node

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Without poweroff node Exynos850-based board continue to draw current
(around ~60 mA with my test setup) after poweroff. Kernel also reports
different lockup problems and RCU stalls warnings continuosly after
last kernel messages about hardware being switched off.
Turns out we missed a write to PMU's PS_HOLD_CONTROL (PMU + 0x30c)
register that actually switches the SoC off.

Add poweroff node that implements this.

With this change the current draw after power off is in range of few
milliampers and lockup messages are no more.

Signed-off-by: Alexey Klimov <alexey.klimov@linaro.org>
Link: https://patch.msgid.link/20260325-exynos850-poweroff-v1-1-34c19c06e74d@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
This commit is contained in:
Alexey Klimov 2026-03-25 00:26:32 +00:00 committed by Krzysztof Kozlowski
parent 254f49634e
commit 47d4dc9018
1 changed files with 7 additions and 0 deletions
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7
arch/arm64/boot/dts/exynos/exynos850.dtsi
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@ -215,6 +215,13 @@ pmu_system_controller: system-controller@11860000 {
compatible = "samsung,exynos850-pmu", "syscon";
reg = <0x11860000 0x10000>;
poweroff: syscon-poweroff {
compatible = "syscon-poweroff";
offset = <0x30c>; /* PS_HOLD_CONTROL */
mask = <0x00000100>;
value = <0x0>;
};
reboot: syscon-reboot {
compatible = "syscon-reboot";
regmap = <&pmu_system_controller>;