linux-kernel - [PATCH 3/4] arm64: dts: rockchip: force PMIC reset behavior to restart PMU on RK3588 Jaguar

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Message-Id: <20250526-rk8xx-rst-fun-v1-3-ea894d9474e0@cherry.de>
Date: Mon, 26 May 2025 19:05:17 +0200
From: Quentin Schulz <foss+kernel@...il.net>
To: Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>, 
 Sebastian Reichel <sebastian.reichel@...labora.com>
Cc: Lukasz Czechowski <lukasz.czechowski@...umatec.com>, 
 Daniel Semkowicz <dse@...umatec.com>, devicetree@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, Quentin Schulz <quentin.schulz@...rry.de>
Subject: [PATCH 3/4] arm64: dts: rockchip: force PMIC reset behavior to
 restart PMU on RK3588 Jaguar

From: Quentin Schulz <quentin.schulz@...rry.de>

The bootloader for RK3588 Jaguar currently forces the PMIC reset
behavior (stored in RST_FUN bitfield in register SYS_CFG3 of the PMIC)
to 0b1X which is incorrect for our devices.

It is required to restart the PMU as otherwise the companion
microcontroller cannot detect the PMIC (and by extension the full
product and main SoC) being rebooted which is an issue as that is used
to reset a few things like the PWM beeper and watchdogs.

Let's add the new rockchip,rst-fun property to make sure the PMIC reset
behavior is the expected one.

Signed-off-by: Quentin Schulz <quentin.schulz@...rry.de>
---
 arch/arm64/boot/dts/rockchip/rk3588-jaguar.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588-jaguar.dts b/arch/arm64/boot/dts/rockchip/rk3588-jaguar.dts
index 9fceea6c1398e92114dcb735cf2babb7d05d67a5..0f431a9a01c4b93ce7ffcb409dbe06de25cc7edd 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588-jaguar.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588-jaguar.dts
@@ -685,6 +685,7 @@ pmic@0 {
 		vcc13-supply = <&vcc_1v1_nldo_s3>;
 		vcc14-supply = <&vcc_1v1_nldo_s3>;
 		vcca-supply = <&vcc5v0_sys>;
+		rockchip,rst-fun = <0>;
 
 		rk806_dvs1_null: dvs1-null-pins {
 			pins = "gpio_pwrctrl1";

-- 
2.49.0