On October 23, 2014 6:08:52 PM PDT, Caesar Wang [off-list ref] wrote:

Dmitry,

? 2014/10/24 8:46, Dmitry Torokhov ??:

quoted

Hi Caesar,

On Thu, Oct 23, 2014 at 05:40:06PM +0800, Caesar Wang wrote:

quoted

This patch is depend on rk3288-thermal.dtsi,or
it will compile error.

If the temperature over a period of time High,over 120C
the resulting TSHUT gave CRU module,let it reset
the entire chip,or via GPIO give PMIC.

Signed-off-by: Caesar Wang <redacted>
---
  arch/arm/boot/dts/rk3288.dtsi | 21 +++++++++++++++++++++
  1 file changed, 21 insertions(+)

diff --git a/arch/arm/boot/dts/rk3288.dtsi

b/arch/arm/boot/dts/rk3288.dtsi

quoted

quoted

index cb18bb4..85fc17a 100644

--- a/arch/arm/boot/dts/rk3288.dtsi
+++ b/arch/arm/boot/dts/rk3288.dtsi

@@ -15,6 +15,7 @@
  #include <dt-bindings/interrupt-controller/arm-gic.h>
  #include <dt-bindings/pinctrl/rockchip.h>
  #include <dt-bindings/clock/rk3288-cru.h>
+#include <dt-bindings/thermal/thermal.h>
  #include "skeleton.dtsi"
  
  / {

@@ -66,6 +67,7 @@
  				 216000  900000
  				 126000  900000
  			>;
+			#cooling-cells = <2>; /* min followed by max */
  			clock-latency = <40000>;
  			clocks = <&cru ARMCLK>;
  		};

@@ -346,6 +348,19 @@
  		status = "disabled";
  	};
  
+	tsadc: tsadc at ff280000 {
+		compatible = "rockchip,rk3288-tsadc";
+		reg = <0xff280000 0x100>;
+		interrupts = <GIC_SPI 37 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&cru SCLK_TSADC>, <&cru PCLK_TSADC>;
+		clock-names = "tsadc", "apb_pclk";
+		pinctrl-names = "default";
+		pinctrl-0 = <&otp_out>;
+		#thermal-sensor-cells = <1>;
+		hw-shut-temp = <120000>;

I do not think this is a good value. You have (in the other DTS file)
passive trip point at 80 and critical (which should result in orderly
shutdown) at 125. But here you define hardware-controlled shutdown at
120C, which is backwards. You should have:

passive <= critical <= hardware

Hmmm....
but, the system will shutdown when temperature over critial value,
there is no chance of triggering the TSHUT.

If the temperature over a period of time High,as we know,
the resulting TSHUT gave CRU module,let it hot-reset the entire chip,
or via GPIO give PMIC cold-reset the entire chip.

Having tshut trigger is not the goal, tshut is the measure of last resort. If we can handle thermal conditions without triggering tshut, we achieved our goal.

Tshut triggering is " oh, crap, nothing we tried works" scenario.


Thanks.

-- 
Dmitry