linux-kernel - [PATCH v2 4/4] arm64: dts: rockchip: force PMIC reset behavior to restart PMU on RK3588 Tiger

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Message-Id: <20250605-rk8xx-rst-fun-v2-4-143d190596dd@cherry.de>
Date: Thu, 05 Jun 2025 17:41:09 +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>, 
 Nicolas Frattaroli <nicolas.frattaroli@...labora.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 v2 4/4] arm64: dts: rockchip: force PMIC reset behavior to
 restart PMU on RK3588 Tiger

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

The bootloader for RK3588 Tiger 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,reset-mode 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-tiger.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588-tiger.dtsi b/arch/arm64/boot/dts/rockchip/rk3588-tiger.dtsi
index c4933a08dd1e3c92f3e0747135faf97c5eeca906..4c05603abed2e458e406ed45f1bc7cdb57b42478 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588-tiger.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3588-tiger.dtsi
@@ -5,6 +5,7 @@
 
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/leds/common.h>
+#include <dt-bindings/mfd/rockchip,rk8xx.h>
 #include <dt-bindings/pinctrl/rockchip.h>
 #include "rk3588.dtsi"
 
@@ -440,6 +441,7 @@ pmic@0 {
 		vcc13-supply = <&vcc_1v1_nldo_s3>;
 		vcc14-supply = <&vcc_1v1_nldo_s3>;
 		vcca-supply = <&vcc5v0_sys>;
+		rockchip,reset-mode = <RK806_RESTART>;
 
 		rk806_dvs1_null: dvs1-null-pins {
 			pins = "gpio_pwrctrl1";

-- 
2.49.0