arm64: dts: renesas: r8a7795: Create thermal zone to support IPA

Setup a thermal zone driven by SoC temperature sensor.
Create passive trip points and bind them to CPUFreq cooling
device that supports power extension.

In R-Car Gen3, IPA is supported for only one channel
(on H3/M3/M3N SoCs, it is channel THS3). Reason:
  Currently, IPA controls base on only CPU temperature.
  And only one thermal channel is assembled closest
  CPU cores is selected as target of IPA.
  If other channels are used, IPA controlling is not properly.

The A5 cooling device supports 5 cooling states which can be categorised as
follows:

0 & 1) boost (clocking up)
2)     default
3 & 4) cooling (clocking down)

Currently the thermal framework assumes that the default is the minimum,
or in other words there is no provision for handling boost states.
So this patch only describes the upper 3 states, default and cooling.

A single cooling device is described for all A57 CPUs and a separate
cooling device is described for all A53 CPUs. This reflects that physically
there is only one cooling device present for each type of CPU.

This patch improves on an earlier version by:

* Omitting cooling-max-level and cooling-min-level properties which
  are no longer present in mainline as of v4.17
* Removing an unused trip-point0 node sub-property from the trips
  property.
* Using cooling-device indexes such that maximum refers to maximum cooling
  rather than the inverse.
* Defers adding dynamic-power-coefficient properties to a separate patch as
  these are properties of the CPU.

The long signed-off by chain below reflects many revisions, mainly
internal, that this patch has been through.

Signed-off-by: Dien Pham <dien.pham.ry@renesas.com>
Signed-off-by: Keita Kobayashi <keita.kobayashi.ym@renesas.com>
Signed-off-by: Gaku Inami <gaku.inami.xw@bp.renesas.com>
Signed-off-by: Hien Dang <hien.dang.eb@rvc.renesas.com>
Signed-off-by: An Huynh <an.huynh.uj@rvc.renesas.com>
Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/arch/arm64/boot/dts/renesas/r8a7795.dtsi b/arch/arm64/boot/dts/renesas/r8a7795.dtsi
index e09bd319e3ca4e4fafbf6f13032b6e62c86af681..f340b663cb806ac8b4970b212f2f7c7ea0397a1f 100644 (file)
--- a/arch/arm64/boot/dts/renesas/r8a7795.dtsi
+++ b/arch/arm64/boot/dts/renesas/r8a7795.dtsi
@@ -207,6 +207,7 @@ a53_0: cpu@100 {
                        power-domains = <&sysc R8A7795_PD_CA53_CPU0>;
                        next-level-cache = <&L2_CA53>;
                        enable-method = "psci";
+                       #cooling-cells = <2>;
                        clocks = <&cpg CPG_CORE R8A7795_CLK_Z2>;
                        operating-points-v2 = <&cluster1_opp>;
                        capacity-dmips-mhz = <535>;
@@ -3179,58 +3180,30 @@ sensor_thermal1: sensor-thermal1 {
                        polling-delay-passive = <250>;
                        polling-delay = <1000>;
                        thermal-sensors = <&tsc 0>;
+                       sustainable-power = <6313>;
 
                        trips {
-                               sensor1_passive: sensor1-passive {
-                                       temperature = <95000>;
-                                       hysteresis = <1000>;
-                                       type = "passive";
-                               };
                                sensor1_crit: sensor1-crit {
                                        temperature = <120000>;
                                        hysteresis = <1000>;
                                        type = "critical";
                                };
                        };
-
-                       cooling-maps {
-                               map0 {
-                                       trip = <&sensor1_passive>;
-                                       cooling-device = <&a57_0 4 4>,
-                                                        <&a57_1 4 4>,
-                                                        <&a57_2 4 4>,
-                                                        <&a57_3 4 4>;
-                               };
-                       };
                };
 
                sensor_thermal2: sensor-thermal2 {
                        polling-delay-passive = <250>;
                        polling-delay = <1000>;
                        thermal-sensors = <&tsc 1>;
+                       sustainable-power = <6313>;
 
                        trips {
-                               sensor2_passive: sensor2-passive {
-                                       temperature = <95000>;
-                                       hysteresis = <1000>;
-                                       type = "passive";
-                               };
                                sensor2_crit: sensor2-crit {
                                        temperature = <120000>;
                                        hysteresis = <1000>;
                                        type = "critical";
                                };
                        };
-
-                       cooling-maps {
-                               map0 {
-                                       trip = <&sensor2_passive>;
-                                       cooling-device = <&a57_0 4 4>,
-                                                        <&a57_1 4 4>,
-                                                        <&a57_2 4 4>,
-                                                        <&a57_3 4 4>;
-                               };
-                       };
                };
 
                sensor_thermal3: sensor-thermal3 {
@@ -3239,11 +3212,12 @@ sensor_thermal3: sensor-thermal3 {
                        thermal-sensors = <&tsc 2>;
 
                        trips {
-                               sensor3_passive: sensor3-passive {
-                                       temperature = <95000>;
+                               target: trip-point1 {
+                                       temperature = <100000>;
                                        hysteresis = <1000>;
                                        type = "passive";
                                };
+
                                sensor3_crit: sensor3-crit {
                                        temperature = <120000>;
                                        hysteresis = <1000>;
@@ -3253,11 +3227,15 @@ sensor3_crit: sensor3-crit {
 
                        cooling-maps {
                                map0 {
-                                       trip = <&sensor3_passive>;
-                                       cooling-device = <&a57_0 4 4>,
-                                                        <&a57_1 4 4>,
-                                                        <&a57_2 4 4>,
-                                                        <&a57_3 4 4>;
+                                       trip = <&target>;
+                                       cooling-device = <&a57_0 2 4>;
+                                       contribution = <1024>;
+                               };
+
+                               map1 {
+                                       trip = <&target>;
+                                       cooling-device = <&a53_0 0 2>;
+                                       contribution = <1024>;
                                };
                        };
                };