linux-kernel - [PATCH V2] ARM: dts: omap3: Add cpu trips and cooling map for omap34/36 families

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Date:   Mon, 17 Aug 2020 08:39:31 -0500
From:   Adam Ford <aford173@...il.com>
To:     linux-omap@...r.kernel.org
Cc:     aford@...conembedded.com, Adam Ford <aford173@...il.com>,
        Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH V2] ARM: dts: omap3: Add cpu trips and cooling map for omap34/36 families

The OMAP3530, OMAP3630, and DM3730 all show thresholds of 90C and 105C
depending on commercial or industrial temperature ratings.

This patch expands the thermal information to include the limits of 90
and 105C for alert and critical.  It sets the coolings-cells for the
34xx and 36xx CPU's which both point to omap3-cpu-thermal.dtsi.

For boards who never use industrial temperatures, these can be
changed on their respective device trees with something like:

&cpu_alert0 {
	temperature = <85000>; /* millicelsius */
};

&cpu_crit {
	temperature = <90000>; /* millicelsius */
};

OMAP3_THERMAL will need to be enabled.  It is off by default.

Signed-off-by: Adam Ford <aford173@...il.com>
Tested-by: H. Nikolaus Schaller <hns@...delico.com> # on GTA04A5 with dm3730cbp100

---
V2:  Rebase on Linux 5.9-rc1

diff --git a/arch/arm/boot/dts/omap3-cpu-thermal.dtsi b/arch/arm/boot/dts/omap3-cpu-thermal.dtsi
index aee46fa8c055..99858eb0d7f6 100644
--- a/arch/arm/boot/dts/omap3-cpu-thermal.dtsi
+++ b/arch/arm/boot/dts/omap3-cpu-thermal.dtsi
@@ -17,4 +17,25 @@ cpu_thermal: cpu_thermal {
 
 			/* sensor       ID */
 	thermal-sensors = <&bandgap     0>;
+
+	cpu_trips: trips {
+		cpu_alert0: cpu_alert {
+			temperature = <90000>; /* millicelsius */
+			hysteresis = <2000>; /* millicelsius */
+			type = "passive";
+		};
+		cpu_crit: cpu_crit {
+			temperature = <105000>; /* millicelsius */
+			hysteresis = <2000>; /* millicelsius */
+			type = "critical";
+		};
+	};
+
+	cpu_cooling_maps: cooling-maps {
+		map0 {
+			trip = <&cpu_alert0>;
+			cooling-device =
+				<&cpu THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+		};
+	};
 };
diff --git a/arch/arm/boot/dts/omap34xx.dtsi b/arch/arm/boot/dts/omap34xx.dtsi
index 9c3ee4ac8165..c0dcc75833a8 100644
--- a/arch/arm/boot/dts/omap34xx.dtsi
+++ b/arch/arm/boot/dts/omap34xx.dtsi
@@ -20,6 +20,7 @@
 			operating-points-v2 = <&cpu0_opp_table>;
 
 			clock-latency = <300000>; /* From legacy driver */
+			#cooling-cells = <2>;
 		};
 	};
 
diff --git a/arch/arm/boot/dts/omap36xx.dtsi b/arch/arm/boot/dts/omap36xx.dtsi
index 9c3beefc0fe0..fadbf308feff 100644
--- a/arch/arm/boot/dts/omap36xx.dtsi
+++ b/arch/arm/boot/dts/omap36xx.dtsi
@@ -25,6 +25,7 @@
 
 			vbb-supply = <&abb_mpu_iva>;
 			clock-latency = <300000>; /* From omap-cpufreq driver */
+			#cooling-cells = <2>;
 		};
 	};
 
-- 
2.17.1