ARM: sun8i: a33: add CPU thermal throttling

This adds CPU thermal throttling for the Allwinner A33. It uses the
thermal sensor present in the SoC's GPADC.

Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

diff --git a/arch/arm/boot/dts/sun8i-a33.dtsi b/arch/arm/boot/dts/sun8i-a33.dtsi
index 0ee3e18..2bf36d8 100644 (file)
--- a/arch/arm/boot/dts/sun8i-a33.dtsi
+++ b/arch/arm/boot/dts/sun8i-a33.dtsi
@@ -43,6 +43,7 @@
  */
 
 #include "sun8i-a23-a33.dtsi"
+#include <dt-bindings/thermal/thermal.h>
 
 / {
        cpu0_opp_table: opp_table0 {
@@ -133,6 +134,7 @@
                        clocks = <&ccu CLK_CPUX>;
                        clock-names = "cpu";
                        operating-points-v2 = <&cpu0_opp_table>;
+                       #cooling-cells = <2>;
                };
 
                cpu@2 {
@@ -388,6 +390,49 @@
                        };
                };
        };
+
+       thermal-zones {
+               cpu_thermal {
+                       /* milliseconds */
+                       polling-delay-passive = <250>;
+                       polling-delay = <1000>;
+                       thermal-sensors = <&ths>;
+
+                       cooling-maps {
+                               map0 {
+                                       trip = <&cpu_alert0>;
+                                       cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+                               };
+                               map1 {
+                                       trip = <&cpu_alert1>;
+                                       cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+                               };
+                       };
+
+                       trips {
+                               cpu_alert0: cpu_alert0 {
+                                       /* milliCelsius */
+                                       temperature = <75000>;
+                                       hysteresis = <2000>;
+                                       type = "passive";
+                               };
+
+                               cpu_alert1: cpu_alert1 {
+                                       /* milliCelsius */
+                                       temperature = <90000>;
+                                       hysteresis = <2000>;
+                                       type = "hot";
+                               };
+
+                               cpu_crit: cpu_crit {
+                                       /* milliCelsius */
+                                       temperature = <110000>;
+                                       hysteresis = <2000>;
+                                       type = "critical";
+                               };
+                       };
+               };
+       };
 };
 
 &ccu {