The Sapphire board has a 12V fan. So, adding it to the DTS.
There is no power supply directly connected, it needs the baseboard to
work.
If the board is used standalone then a hardware modification is needed.
On the Sapphire board there is an unpopulated resistor to connect it to
VBUS_TYPEC, which is usually 5V (too low) and can range up to 20V
(too high).
I tested it for a week connected to VCC_SYS which is 8.4V and proved to
be more than enough for the required cooling needs. This is the
connection described in the comment.
Signed-off-by: Vicente Bergas <vicencb@xxxxxxxxx>
---
.../boot/dts/rockchip/rk3399-sapphire.dtsi | 38 +++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi
index 5421e23760c3..90d813bdabde 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi
@@ -66,6 +66,19 @@
regulator-max-microvolt = <12000000>;
};
+ /*
+ * The fan power supply comes from the baseboard.
+ * For the standalone Sapphire one option is to connect a wire
+ * from R90030 DNP R0805 pin2 to C90002 10uF C0805 pin1 (vcc_sys).
+ */
+ fan0: gpio-fan {
+ #cooling-cells = <2>;
+ compatible = "gpio-fan";
+ gpio-fan,speed-map = <0 0 3000 1>;
+ gpios = <&gpio1 RK_PC2 GPIO_ACTIVE_HIGH>;
+ status = "okay";
+ };
+
keys: gpio-keys {
compatible = "gpio-keys";
autorepeat;
@@ -183,6 +196,24 @@
cpu-supply = <&vdd_cpu_b>;
};
+&cpu_thermal {
+ trips {
+ cpu_hot: cpu_hot {
+ hysteresis = <10000>;
+ temperature = <55000>;
+ type = "active";
+ };
+ };
+
+ cooling-maps {
+ map2 {
+ cooling-device =
+ <&fan0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+ trip = <&cpu_hot>;
+ };
+ };
+};
+
&emmc_phy {
status = "okay";
};
@@ -472,6 +503,13 @@
};
};
+ fan {
+ motor_pwr: motor-pwr {
+ rockchip,pins =
+ <RK_GPIO1 RK_PC2 RK_FUNC_GPIO &pcfg_pull_none>;
+ };
+ };
+
pmic {
pmic_int_l: pmic-int-l {
rockchip,pins =
--
2.19.0
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