linux-kernel - Re: [PATCH v4 6/6] ARM: sun8i: h3: add partial CPU thermal zone

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Date:   Sat, 16 Sep 2017 12:05:49 +0200
From:   Quentin Schulz <quentin.schulz@...e-electrons.com>
To:     Icenowy Zheng <icenowy@...c.io>, Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Jonathan Cameron <jic23@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH v4 6/6] ARM: sun8i: h3: add partial CPU thermal zone

Hi Icenowy,

On 14/09/2017 16:52, Icenowy Zheng wrote:
> Because of the restriction of the OF thermal framework, the thermal
> sensor will fail to probe if the thermal zone doesn't exist.
> 

Oh no, that's not good.

We discussed about it on IRC and I even proposed a patch for it, telling
you I would post it on the mailing list soon after. Of course, I forgot
and you definitely should have yelled at me for not doing it :)

I won't be able to test the patch soon. I can send it to you so that you
can test it and integrate it in your patch series so it won't block you.
Otherwise, we'll have to wait for a week or two for me to test it.

Thanks and sorry for forgetting to post the patch you need,
Quentin

> Add a partial thermal zone which claims the H3 THS as the thermal sensor.
> 
> The cooling device (CPU DVFS) is still not added as it's not ready, and
> the trip points are also not added yet.
> 
> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> ---
>  arch/arm/boot/dts/sun8i-h3.dtsi | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/sun8i-h3.dtsi b/arch/arm/boot/dts/sun8i-h3.dtsi
> index 3220da3ad790..687c6457d214 100644
> --- a/arch/arm/boot/dts/sun8i-h3.dtsi
> +++ b/arch/arm/boot/dts/sun8i-h3.dtsi
> @@ -89,6 +89,15 @@
>  		};
>  	};
>  
> +	thermal-zones {
> +		cpu-thermal {
> +			/* milliseconds */
> +			polling-delay-passive = <250>;
> +			polling-delay = <1000>;
> +			thermal-sensors = <&ths>;
> +		};
> +	};
> +
>  	timer {
>  		compatible = "arm,armv7-timer";
>  		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> 

-- 
Quentin Schulz, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com