linux-kernel - [PATCH 4/4] ARM: shmobile: r8a7793: enable to use thermal-zone

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Message-ID: <87y4bk3ieo.wl%kuninori.morimoto.gx@renesas.com>
Date:	Wed, 20 Jan 2016 05:57:56 +0000
From:	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:	Eduardo Valentin <edubezval@...il.com>
CC:	Zhang Rui <rui.zhang@...el.com>, Simon <horms@...ge.net.au>,
	Magnus <magnus.damm@...il.com>,
	Linux-Kernel <linux-kernel@...r.kernel.org>,
	<linux-pm@...r.kernel.org>
Subject: [PATCH 4/4] ARM: shmobile: r8a7793: enable to use thermal-zone


From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>

This patch enables to use thermal-zone on r8a7793.
This thermal sensor can measure temperature from -40000 to 125000,
but over 117000 can be critical on this chip.
Thus, default critical temperature is now set as 115000 (this driver
is using 5000 steps) (Current critical temperature is using it as
90000, but there is no big reason about it)

And it doesn't check thermal zone periodically (same as current
behavior). You can exchange it by modifying polling-delay[-passive]
property.

You can set trip temp if your kernel has CONFIG_THERMAL_WRITABLE_TRIPS,
but you need to take care to use it, since it will call
orderly_poweroff() it it reaches to the value.
echo $temp > /sys/class/thermal/thermal_zone0/trip_point_0_temp

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
---
 arch/arm/boot/dts/r8a7793.dtsi | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boot/dts/r8a7793.dtsi b/arch/arm/boot/dts/r8a7793.dtsi
index 82c3bc9..44d07f4 100644
--- a/arch/arm/boot/dts/r8a7793.dtsi
+++ b/arch/arm/boot/dts/r8a7793.dtsi
@@ -54,6 +54,25 @@
 		};
 	};
 
+	thermal-zones {
+		cpu_thermal: cpu-thermal {
+			polling-delay-passive	= <0>;
+			polling-delay		= <0>;
+
+			thermal-sensors = <&thermal>;
+
+			trips {
+				cpu-crit {
+					temperature	= <115000>;
+					hysteresis	= <0>;
+					type		= "critical";
+				};
+			};
+			cooling-maps {
+			};
+		};
+	};
+
 	gic: interrupt-controller@...01000 {
 		compatible = "arm,gic-400";
 		#interrupt-cells = <3>;
@@ -170,12 +189,15 @@
 		power-domains = <&cpg_clocks>;
 	};
 
-	thermal@...f0000 {
-		compatible = "renesas,thermal-r8a7793", "renesas,rcar-thermal";
+	thermal: thermal@...f0000 {
+		compatible =	"renesas,thermal-r8a7793",
+				"renesas,rcar-gen2-thermal",
+				"renesas,rcar-thermal";
 		reg = <0 0xe61f0000 0 0x14>, <0 0xe61f0100 0 0x38>;
 		interrupts = <0 69 IRQ_TYPE_LEVEL_HIGH>;
 		clocks = <&mstp5_clks R8A7793_CLK_THERMAL>;
 		power-domains = <&cpg_clocks>;
+		#thermal-sensor-cells = <0>;
 	};
 
 	timer {
-- 
1.9.1