linux-kernel - Re: [PATCH V7 11/12] arm64: tegra: add soctherm node for Tegra210

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Date:	Tue, 15 Mar 2016 12:46:22 -0700
From:	Eduardo Valentin <edubezval@...il.com>
To:	Wei Ni <wni@...dia.com>
Cc:	rui.zhang@...el.com, thierry.reding@...il.com,
	MLongnecker@...dia.com, swarren@...dotorg.org,
	mikko.perttunen@...si.fi, linux-tegra@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V7 11/12] arm64: tegra: add soctherm node for Tegra210

On Tue, Mar 15, 2016 at 06:43:00PM +0800, Wei Ni wrote:
> 
> 
> On 2016年03月15日 03:25, Eduardo Valentin wrote:
> > * PGP Signed by an unknown key
> > 
> > On Fri, Mar 11, 2016 at 11:11:34AM +0800, Wei Ni wrote:
> >> Adds soctherm node for Tegra210, and add cpu,
> >> gpu, mem, pllx as thermal-zones. Set critical
> >> trip temp for cpu and gpu thermal zone.
> >>
> >> Signed-off-by: Wei Ni <wni@...dia.com>
> >> ---
> >>  arch/arm64/boot/dts/nvidia/tegra210.dtsi | 60 ++++++++++++++++++++++++++++++++
> >>  1 file changed, 60 insertions(+)
> >>
> >> diff --git a/arch/arm64/boot/dts/nvidia/tegra210.dtsi b/arch/arm64/boot/dts/nvidia/tegra210.dtsi
> >> index cd4f45ccd6a7..c7ef500a347e 100644
> >> --- a/arch/arm64/boot/dts/nvidia/tegra210.dtsi
> >> +++ b/arch/arm64/boot/dts/nvidia/tegra210.dtsi
> >> @@ -3,6 +3,7 @@
> >>  #include <dt-bindings/memory/tegra210-mc.h>
> >>  #include <dt-bindings/pinctrl/pinctrl-tegra.h>
> >>  #include <dt-bindings/interrupt-controller/arm-gic.h>
> >> +#include <dt-bindings/thermal/tegra124-soctherm.h>
> >>  
> >>  / {
> >>  	compatible = "nvidia,tegra210";
> >> @@ -802,4 +803,63 @@
> >>  				(GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
> >>  		interrupt-parent = <&gic>;
> >>  	};
> >> +
> >> +	soctherm: thermal-sensor@0,700e2000 {
> >> +		compatible = "nvidia,tegra210-soctherm";
> >> +		reg = <0x0 0x700e2000 0x0 0x1000>;
> >> +		interrupts = <GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>;
> >> +		clocks = <&tegra_car TEGRA210_CLK_TSENSOR>,
> >> +			<&tegra_car TEGRA210_CLK_SOC_THERM>;
> >> +		clock-names = "tsensor", "soctherm";
> >> +		resets = <&tegra_car 78>;
> >> +		reset-names = "soctherm";
> >> +		#thermal-sensor-cells = <1>;
> >> +	};
> >> +
> >> +	thermal-zones {
> >> +		cpu {
> >> +			polling-delay-passive = <1000>;
> >> +			polling-delay = <0>;
> >> +
> >> +			thermal-sensors =
> >> +				<&soctherm TEGRA124_SOCTHERM_SENSOR_CPU>;
> >> +
> >> +			trips {
> >> +				cpu_shutdown_trip: shutdown-trip {
> >> +					temperature = <102500>;
> >> +					hysteresis = <1000>;
> >> +					type = "critical";
> >> +				};
> >> +			};
> >> +		};
> >> +		mem {
> >> +			polling-delay-passive = <0>;
> >> +			polling-delay = <0>;
> >> +
> >> +			thermal-sensors =
> >> +				<&soctherm TEGRA124_SOCTHERM_SENSOR_MEM>;
> > 
> > 
> > Why no trips for mem? Why should we  care ?
> 
> The critical trip temperature will be set to HW for critical shutdown. Normally,
> we just take care the CPU and GPU temperature. And in HW, the MEM use the same
> critical trip with GPU. For PLLX, we just keep the default critical trip in HW.
> So I didn't configure the MEM and PLLX. I can add critical trips for them.

Ok. Please add them.

> 
> > 
> > Please have a look on the binding to check for mandatory properties and
> > sub nodes.
> 
> Hmm, yes, the trips and cooling-maps are required properties. How about to add a
> dummy-cool-dev, so that it could be compatible with the binding.
> 

Yeah, what people are doing, when the cooling devices are not ready to
be linked, is to add an empty section of cooling-maps.


> Wei.
> 
> > 
> >> +		};
> >> +		gpu {
> >> +			polling-delay-passive = <1000>;
> >> +			polling-delay = <0>;
> >> +
> >> +			thermal-sensors =
> >> +				<&soctherm TEGRA124_SOCTHERM_SENSOR_GPU>;
> >> +
> >> +			trips {
> >> +				gpu_shutdown_trip: shutdown-trip {
> >> +					temperature = <103000>;
> >> +					hysteresis = <1000>;
> >> +					type = "critical";
> >> +				};
> >> +			};
> >> +		};
> >> +		pllx {
> >> +			polling-delay-passive = <0>;
> >> +			polling-delay = <0>;
> >> +
> >> +			thermal-sensors =
> >> +				<&soctherm TEGRA124_SOCTHERM_SENSOR_PLLX>;
> > 
> > ditto
> > 
> >> +		};
> >> +	};
> >>  };
> >> -- 
> >> 1.9.1
> >>
> > 
> > * Unknown Key
> > * 0x7DA4E256
> > 

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