arm64: dts: rockchip: hook up the MCU on the QNAP TS433

A patch from »Drivers to support the MCU on QNAP NAS devices« in state Mainline for linux-kernel

From: Heiko Stuebner <heiko@...> Date: Thu, 25 Jul 2024 20:32:52 +0200

Commit-Message

The MCU is an important part of the device functionality. It provides functionality like fan-control, more leds, etc and even more important without it, the NAS-device cannot even fully turned off. Hook up the serial device to its uart and hook into the thermal management to control the fan according to the cpu temperature. While the MCU also provides a temperature sensor for the case, this one is just polled and does not provide functionality for handling trip points in hardware, so a lot of polling would be involved. As the cpu is only cooled passively in these devices, it's temperature rising will indicate the temperature level of the system just earlier. Signed-off-by: Heiko Stuebner <heiko@...>

Patch-Comment

.../boot/dts/rockchip/rk3568-qnap-ts433.dts | 57 +++++++++++++++++++ 1 file changed, 57 insertions(+)

Statistics

  • 57 lines added
  • 0 lines removed

Changes

-------------- arch/arm64/boot/dts/rockchip/rk3568-qnap-ts433.dts --------------
index e601d9271ba8..4bc5f5691d45 100644
@@ -483,6 +483,54 @@ rgmii_phy0: ethernet-phy@0 {
};
};
+/*
+ * The MCU can provide system temperature too, but only by polling and of
+ * course also cannot set trip points. So attach to the cpu thermal-zone
+ * instead to control the fan.
+ */
+&cpu_thermal {
+ trips {
+ case_fan0: case-fan0 {
+ hysteresis = <2000>;
+ temperature = <35000>;
+ type = "active";
+ };
+
+ case_fan1: case-fan1 {
+ hysteresis = <2000>;
+ temperature = <45000>;
+ type = "active";
+ };
+
+ case_fan2: case-fan2 {
+ hysteresis = <2000>;
+ temperature = <65000>;
+ type = "active";
+ };
+ };
+
+ cooling-maps {
+ /*
+ * Always provide some air movement, due to small case
+ * full of harddrives.
+ */
+ map1 {
+ cooling-device = <&fan THERMAL_NO_LIMIT 1>;
+ trip = <&case_fan0>;
+ };
+
+ map2 {
+ cooling-device = <&fan 2 3>;
+ trip = <&case_fan1>;
+ };
+
+ map3 {
+ cooling-device = <&fan 4 THERMAL_NO_LIMIT>;
+ trip = <&case_fan2>;
+ };
+ };
+};
+
&pcie30phy {
data-lanes = <1 2>;
status = "okay";
@@ -582,6 +630,15 @@ &tsadc {
*/
&uart0 {
status = "okay";
+
+ mcu {
+ compatible = "qnap,ts433-mcu";
+
+ fan: fan-0 {
+ #cooling-cells = <2>;
+ cooling-levels = <0 64 89 128 166 204 221 238>;
+ };
+ };
};
/*
 
 

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