linux-kernel - [PATCH] arm64: dts: rockchip: switch Rock 5C to PMIC-based TSHUT reset

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Message-Id: <20250204-rock-5c-tshut-v1-1-33301e4eef64@gmail.com>
Date: Tue, 04 Feb 2025 13:02:28 +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>
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>
Subject: [PATCH] arm64: dts: rockchip: switch Rock 5C to PMIC-based TSHUT
 reset

Radxa Rock 5C supports both CRU-based (default) and PMIC-based reset
upon thermal runaway conditions. The former resets the SoC by internally
poking the CRU from TSADC, while the latter power-cycles the whole board
by pulling the PMIC reset line low in case of uncontrolled overheating.

Switch to a PMIC-based reset, as the more 'thorough' of the two.

Tested by temporarily setting rockchip,hw-tshut-temp to 65C to simulate
overheating - this causes the board to reset when any of the on-chip
temperature sensors surpasses the tshut temperature.

Requires Alexander's patch [1] fixing TSADC pinctrl assignment

[1] https://lore.kernel.org/r/20250130053849.4902-1-eagle.alexander923@gmail.com

Signed-off-by: Alexey Charkov <alchark@...il.com>
---
 arch/arm64/boot/dts/rockchip/rk3588s-rock-5c.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588s-rock-5c.dts b/arch/arm64/boot/dts/rockchip/rk3588s-rock-5c.dts
index 6e56d7704cbe0dc06242cb39df56b2fc9d6bc774..00b2d87a6bce4af883a3e7c7e606ea5b96c68b19 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588s-rock-5c.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588s-rock-5c.dts
@@ -873,6 +873,8 @@ regulator-state-mem {
 };
 
 &tsadc {
+	rockchip,hw-tshut-mode = <1>; /* tshut mode 0:CRU 1:GPIO */
+	rockchip,hw-tshut-polarity = <0>; /* tshut polarity 0:LOW 1:HIGH */
 	status = "okay";
 };
 

---
base-commit: 6399b505aad2531d6244f3e943ad384b56095710
change-id: 20250204-rock-5c-tshut-15c6b8f96e42

Best regards,
-- 
Alexey Charkov <alchark@...il.com>