102 lines
2.9 KiB
Diff
102 lines
2.9 KiB
Diff
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From 2b2e9d0e1ee4765b21c648235489028c6dc7e336 Mon Sep 17 00:00:00 2001
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From: Linus Walleij <linus.walleij@linaro.org>
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Date: Tue, 31 Dec 2019 18:18:08 +0100
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Subject: [PATCH 4/7] ARM: dts: gemini: Add thermal zone to DIR-685
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The DIR-685 can now exploit the thermal zone added by the
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drive temperature sensor inside the hard drive. We have
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patched the libata subsystem to assign the device nodes
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properly to the SCSI devices and this is what the drivetemp
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driver will use to populate the sensor and the thermal
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zone, so pick that up into the thermal zone and let this
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control the fan.
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The hardware lacks an embedded temperature sensor so the
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D-Link vendor firmware uses this method to control the
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temperature of the NAS enclosure using the thermal sensor
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inside the hard drive.
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The drive temperature trigger points to be used comes from
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the vendor firmware.
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Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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---
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arch/arm/boot/dts/gemini-dlink-dir-685.dts | 48 ++++++++++++++++++++--
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1 file changed, 45 insertions(+), 3 deletions(-)
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--- a/arch/arm/boot/dts/gemini-dlink-dir-685.dts
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+++ b/arch/arm/boot/dts/gemini-dlink-dir-685.dts
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@@ -119,13 +119,11 @@
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/*
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* This is a Sunon Maglev GM0502PFV2-8 cooling fan @10000 RPM.
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- * Since the platform has no temperature sensor, this is controlled
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- * from userspace by using the hard disks S.M.A.R.T. temperature
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* sensor. It is turned on when the temperature exceeds 46 degrees
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* and turned off when the temperatures goes below 41 degrees
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* (celsius).
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*/
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- gpio-fan {
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+ fan0: gpio-fan {
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compatible = "gpio-fan";
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/* Collides with IDE */
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gpios = <&gpio1 6 GPIO_ACTIVE_HIGH>;
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@@ -133,6 +131,40 @@
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#cooling-cells = <2>;
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};
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+ thermal-zones {
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+ chassis-thermal {
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+ /* Poll every 20 seconds */
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+ polling-delay = <20000>;
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+ /* Poll every 2nd second when cooling */
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+ polling-delay-passive = <2000>;
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+ /* Use the thermal sensor in the hard drive */
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+ thermal-sensors = <&drive0>;
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+
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+ /* Tripping points from the fan.script in the rootfs */
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+ trips {
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+ alert: chassis-alert {
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+ /* At 43 degrees turn on the fan */
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+ temperature = <43000>;
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+ hysteresis = <3000>;
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+ type = "active";
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+ };
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+ crit: chassis-crit {
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+ /* Just shut down at 60 degrees */
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+ temperature = <60000>;
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+ hysteresis = <2000>;
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+ type = "critical";
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+ };
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+ };
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+
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+ cooling-maps {
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+ map0 {
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+ trip = <&alert>;
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+ cooling-device = <&fan0 1 1>;
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+ };
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+ };
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+ };
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+ };
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+
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/*
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* The touchpad input is connected to a GPIO bit-banged
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* I2C bus.
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@@ -445,6 +477,16 @@
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ide@63000000 {
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status = "okay";
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+
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+ /*
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+ * This drive may have a temperature sensor with a
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+ * thermal zone we can use for thermal control of the
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+ * chassis temperature using the fan.
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+ */
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+ drive0: ide-port@0 {
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+ reg = <0>;
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+ #thermal-sensor-cells = <0>;
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+ };
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};
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display-controller@6a000000 {
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