linux-kernel - Re: [RFC PATCH v2 4/4] ARM: sun8i: h3: add support for the thermal sensor in H3

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Message-ID: <3f13c07d-be6a-0350-6d86-de1a4d4e33a8@free-electrons.com>
Date:   Sun, 2 Apr 2017 16:34:55 +0200
From:   Quentin Schulz <quentin.schulz@...e-electrons.com>
To:     icenowy@...c.io, Lee Jones <lee.jones@...aro.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>
Cc:     devicetree@...r.kernel.org, linux-pm@...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: [RFC PATCH v2 4/4] ARM: sun8i: h3: add support for the thermal
 sensor in H3

Hi Icenowy,

On 02/04/2017 15:33, Icenowy Zheng wrote:
> As we have gained the support for the thermal sensor in H3, we can now
> add its device nodes to the device tree.
> 
> Add them to the H3 device tree.
> 
> The H5 thermal sensor has some differences, and will be added furtherly.
> 
> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> ---
>  arch/arm/boot/dts/sun8i-h3.dtsi | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/sun8i-h3.dtsi b/arch/arm/boot/dts/sun8i-h3.dtsi
> index b36f9f423c39..552217bb9266 100644
> --- a/arch/arm/boot/dts/sun8i-h3.dtsi
> +++ b/arch/arm/boot/dts/sun8i-h3.dtsi
> @@ -72,6 +72,32 @@
>  		};
>  	};
>  
> +	iio-hwmon {
> +		compatible = "iio-hwmon";
> +		io-channels = <&ths>;
> +	};
> +
> +	soc {
> +		ths: ths@...25000 {
> +			compatible = "allwinner,sun8i-h3-ths";
> +			reg = <0x01c25000 0x100>;
> +			clocks = <&ccu CLK_BUS_THS>, <&ccu CLK_THS>;
> +			clock-names = "bus", "ths";
> +			resets = <&ccu RST_BUS_THS>;
> +			#thermal-sensor-cells = <0>;
> +			#io-channel-cells = <0>;
> +		};
> +	};
> +
> +	thermal-zones {
> +		cpu_thermal {
> +			/* milliseconds */
> +			polling-delay-passive = <250>;
> +			polling-delay = <1000>;
> +			thermal-sensors = <&ths>;
> +		};

Would it make sense to add the CPU temp trip points in this patch? Or do
we wait to have CPU OPPs and thermal throttling to add them?

I guess you can find them either in the datasheet or in vendor tree.

Thanks,
Quentin

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