oxnas: some improvements for Shuttle KD20

* install kmod-hwmon-drivetemp by default
 * wire up thermal zone
 * fix fan GPIO polarity
 * fix i2c-gpio GPIO_OPEN_DRAIN

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

target/linux/oxnas/config-5.4

@@ -328,6 +328,12 @@ CONFIG_SUSPEND=y
 CONFIG_SUSPEND_FREEZER=y
 CONFIG_SWPHY=y
 CONFIG_SYS_SUPPORTS_APM_EMULATION=y
+CONFIG_THERMAL=y
+CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE=y
+CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS=0
+CONFIG_THERMAL_GOV_STEP_WISE=y
+CONFIG_THERMAL_HWMON=y
+CONFIG_THERMAL_OF=y
 CONFIG_TICK_CPU_ACCOUNTING=y
 CONFIG_TIMER_OF=y
 CONFIG_TIMER_PROBE=y

target/linux/oxnas/files/arch/arm/boot/dts/ox820-shuttle-kd20.dts

@@ -4,6 +4,7 @@
 
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/input/input.h>
+#include <dt-bindings/thermal/thermal.h>
 
 / {
 	model = "Shuttle KD20";
@@ -30,13 +31,48 @@
 		led-upgrade = &led_warn;
 	};
 
+	thermal_zones {
+		chassis-thermal {
+			/* Poll every 20 seconds */
+			polling-delay = <20000>;
+			/* Poll every 2nd second when cooling */
+			polling-delay-passive = <2000>;
+
+			thermal-sensors = <&hdd0_temp>, <&hdd1_temp>;
+
+			trips {
+				chassis_alert0: chassis-alert0 {
+					/* At 43 degrees turn on fan */
+					temperature = <43000>;
+					hysteresis = <3000>;
+					type = "active";
+				};
+
+				chassis_alert1: chassis-alert1 {
+					/* At 60 degrees emergency shutdown */
+					temperature = <60000>;
+					hysteresis = <2000>;
+					type = "critical";
+				};
+			};
+
+			cooling-maps {
+				map0 {
+					trip = <&chassis_alert0>;
+					cooling-device = <&system_fan THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+				};
+			};
+		};
+	};
+
 	i2c-gpio {
 		compatible = "i2c-gpio";
-		sda-gpios = <&gpio1 9 (GPIO_ACTIVE_HIGH|GPIO_LINE_OPEN_DRAIN)>;
-		sck-gpios = <&gpio1 10 (GPIO_ACTIVE_HIGH|GPIO_LINE_OPEN_DRAIN)>;
+		sda-gpios = <&gpio1 9 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
+		sck-gpios = <&gpio1 10 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
 		i2c-gpio,delay-us = <10>;
 		#address-cells = <1>;
 		#size-cells = <0>;
+
 		rtc0: rtc@51 {
 			compatible = "nxp,pcf8563";
 			reg = <0x51>;
@@ -112,9 +148,9 @@
 		gpios = <&gpio1 11 GPIO_ACTIVE_HIGH>;
 	};
 
-	gpio-fan {
+	system_fan: gpio-fan {
 		compatible = "gpio-fan";
-		gpios = <&gpio0 2 GPIO_ACTIVE_LOW>;
+		gpios = <&gpio0 2 GPIO_ACTIVE_HIGH>;
 		gpio-fan,speed-map = <0    0
 				      3000 1>;
 	};
@@ -193,6 +229,16 @@
 &sata {
 	status = "okay";
 	nr-ports = <2>;
+
+	hdd0_temp: sata-port@0 {
+		reg = <0>;
+		#thermal-sensor-cells = <0>;
+	};
+
+	hdd1_temp: sata-port@1 {
+		reg = <1>;
+		#thermal-sensor-cells = <0>;
+	};
 };
 
 &pcie_phy {

target/linux/oxnas/image/ox820.mk

@@ -73,9 +73,9 @@ define Device/shuttle_kd20
   KERNEL_INITRAMFS = kernel-bin | append-dtb | uImage none | omninas-factory | \
 	encrypt-3des sohmuntitnlaes
   DEVICE_PACKAGES := kmod-usb2-oxnas kmod-usb3 kmod-usb-ledtrig-usbport \
-	kmod-i2c-gpio kmod-rtc-pcf8563 kmod-gpio-beeper kmod-hwmon-gpiofan \
-	kmod-ata-oxnas-sata kmod-md-mod kmod-md-raid0 kmod-md-raid1 kmod-fs-ext4 \
-	kmod-fs-xfs
+	kmod-i2c-gpio kmod-rtc-pcf8563 kmod-gpio-beeper kmod-hwmon-drivetemp \
+	kmod-hwmon-gpiofan kmod-ata-oxnas-sata kmod-md-mod kmod-md-raid0 \
+	kmod-md-raid1 kmod-fs-ext4 kmod-fs-xfs
 endef
 TARGET_DEVICES += shuttle_kd20