linux-kernel - Re: [PATCH 14/15] thermal: Add Mediatek thermal controller support

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Message-ID: <20150515061222.GK6325@pengutronix.de>
Date:	Fri, 15 May 2015 08:12:22 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Wei-Ning Huang <wnhuang@...gle.com>
Cc:	Paul Bolle <pebolle@...cali.nl>,
	Stephen Warren <swarren@...dotorg.org>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Eduardo Valentin <edubezval@...il.com>,
	Mikko Perttunen <mikko.perttunen@...si.fi>,
	linux-mediatek@...ts.infradead.org, kernel@...gutronix.de,
	Zhang Rui <rui.zhang@...el.com>,
	Brian Norris <computersforpeace@...il.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 14/15] thermal: Add Mediatek thermal controller support

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.hauer@...gutronix.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.hauer@...gutronix.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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