From 0fe4d2181cc4cb3eba303c0e03f878d2558d0f3a Mon Sep 17 00:00:00 2001
From: Stefan Wahren <stefan.wahren@i2se.com>
Date: Fri, 31 Mar 2017 20:03:04 +0000
Subject: [PATCH] ARM: dts: bcm283x: Add CPU thermal zone with 1 trip point

As suggested by Eduardo Valentin this adds the thermal zone for
the bcm2835 SoC with its single thermal sensor. We start with
the criticial trip point and leave the cooling devices empty
since we don't have any at the moment. Since the coefficients
could vary depending on the SoC we need to define them separate.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Acked-by: Eduardo Valentin <edubezval@gmail.com>
---
 arch/arm/boot/dts/bcm2835.dtsi |  4 ++++
 arch/arm/boot/dts/bcm2836.dtsi |  4 ++++
 arch/arm/boot/dts/bcm283x.dtsi | 21 +++++++++++++++++++++
 3 files changed, 29 insertions(+)

diff --git a/arch/arm/boot/dts/bcm2835.dtsi b/arch/arm/boot/dts/bcm2835.dtsi
index 0890d97e674d..659b6e9513b1 100644
--- a/arch/arm/boot/dts/bcm2835.dtsi
+++ b/arch/arm/boot/dts/bcm2835.dtsi
@@ -24,6 +24,10 @@
 	};
 };
 
+&cpu_thermal {
+	coefficients = <(-538)	407000>;
+};
+
 /* enable thermal sensor with the correct compatible property set */
 &thermal {
 	compatible = "brcm,bcm2835-thermal";
diff --git a/arch/arm/boot/dts/bcm2836.dtsi b/arch/arm/boot/dts/bcm2836.dtsi
index 519a44f5d25a..da3deeb42592 100644
--- a/arch/arm/boot/dts/bcm2836.dtsi
+++ b/arch/arm/boot/dts/bcm2836.dtsi
@@ -77,6 +77,10 @@
 	interrupts = <8>;
 };
 
+&cpu_thermal {
+	coefficients = <(-538)	407000>;
+};
+
 /* enable thermal sensor with the correct compatible property set */
 &thermal {
 	compatible = "brcm,bcm2836-thermal";
diff --git a/arch/arm/boot/dts/bcm283x.dtsi b/arch/arm/boot/dts/bcm283x.dtsi
index 561f27d8d922..86a5db53da8f 100644
--- a/arch/arm/boot/dts/bcm283x.dtsi
+++ b/arch/arm/boot/dts/bcm283x.dtsi
@@ -19,6 +19,26 @@
 		bootargs = "earlyprintk console=ttyAMA0";
 	};
 
+	thermal-zones {
+		cpu_thermal: cpu-thermal {
+			polling-delay-passive = <0>;
+			polling-delay = <1000>;
+
+			thermal-sensors = <&thermal>;
+
+			trips {
+				cpu-crit {
+					temperature	= <80000>;
+					hysteresis	= <0>;
+					type		= "critical";
+				};
+			};
+
+			cooling-maps {
+			};
+		};
+	};
+
 	soc {
 		compatible = "simple-bus";
 		#address-cells = <1>;
@@ -430,6 +450,7 @@
 			compatible = "brcm,bcm2835-thermal";
 			reg = <0x7e212000 0x8>;
 			clocks = <&clocks BCM2835_CLOCK_TSENS>;
+			#thermal-sensor-cells = <0>;
 			status = "disabled";
 		};