Hi Wei-Ning,
On Fri, May 15, 2015 at 01:33:02PM +0800, Wei-Ning Huang wrote:
> Hi Sascha,
> I tried these patches but I didn't see any entries under
> '/sys/class/thermal', am I missing something?
> Wei-Ning
Please write a mail to me rather than to Paul if you want me to react.
You'll need a dts snippet that registers a thermal zone. Try the
attached patch. I haven't posted it because it only contains my testing
code which registers a fake gpio controlled fan.
Sascha
-----------------------------8<-----------------------------
>From 2ea6d94fe430c317064d06b46a8d0d2036ca4236 Mon Sep 17 00:00:00 2001
From: Sascha Hauer <s.ha...@pengutronix.de>
Date: Tue, 12 May 2015 09:24:25 +0200
Subject: [PATCH] ARM64: dts: mt8173-evb: debugging: Add fake thermal zone
This adds a thermal zone for the CPU which is controlled by a fan. No
fan exists on this board and the temperatures are bogus. This is only
for debugging purposes until the cpufreq driver is available.
Signed-off-by: Sascha Hauer <s.ha...@pengutronix.de>
---
arch/arm64/boot/dts/mediatek/mt8173-evb.dts | 39 +++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/arch/arm64/boot/dts/mediatek/mt8173-evb.dts
b/arch/arm64/boot/dts/mediatek/mt8173-evb.dts
index 43d5401..0a1f905 100644
--- a/arch/arm64/boot/dts/mediatek/mt8173-evb.dts
+++ b/arch/arm64/boot/dts/mediatek/mt8173-evb.dts
@@ -14,6 +14,7 @@
/dts-v1/;
#include "mt8173.dtsi"
+#include <dt-bindings/thermal/thermal.h>
/ {
model = "mediatek,mt8173-evb";
@@ -31,6 +32,44 @@
};
chosen { };
+
+ fan: gpio_fan {
+ compatible = "gpio-fan";
+ gpios = <&pio 24 0>;
+ gpio-fan,speed-map = <0 0
+ 4500 1>;
+ #cooling-cells = <2>;
+ };
+
+ thermal-zones {
+ cpu_thermal: cpu_thermal {
+ polling-delay-passive = <1000>; /* milliseconds */
+ polling-delay = <0>; /* milliseconds */
+
+ thermal-sensors = <&thermal 0>;
+
+ trips {
+ cpu_passive: cpu_passive {
+ temperature = <47000>; /* millicelsius
*/
+ hysteresis = <2000>; /* millicelsius */
+ type = "passive";
+ };
+
+ cpu_crit {
+ temperature = <90000>; /* millicelsius
*/
+ hysteresis = <2000>; /* millicelsius */
+ type = "critical";
+ };
+ };
+
+ cooling-maps {
+ map0 {
+ trip = <&cpu_passive>;
+ cooling-device = <&fan THERMAL_NO_LIMIT
THERMAL_NO_LIMIT>;
+ };
+ };
+ };
+ };
};
&uart0 {
--
2.1.4
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