linux-kernel - Re: [PATCH v3,1/8] arm64: dts: mt8183: add thermal zone node

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Date:   Thu, 20 Feb 2020 21:57:26 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Michael Kao <michael.kao@...iatek.com>
Cc:     Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, hsinyi@...omium.org,
        linux-pm@...r.kernel.org, srv_heupstream@...iatek.com,
        devicetree@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3,1/8] arm64: dts: mt8183: add thermal zone node



On 20/02/2020 12:52, Daniel Lezcano wrote:
> On 11/02/2020 04:17, Michael Kao wrote:
>> On Thu, 2020-01-09 at 12:31 +0100, Daniel Lezcano wrote:
>>> On 03/01/2020 07:44, Michael Kao wrote:
>>>> From: "michael.kao" <michael.kao@...iatek.com>
>>>>
>>>> Add thermal zone node to Mediatek MT8183 dts file.
>>>>
>>>> Signed-off-by: Michael Kao <michael.kao@...iatek.com>
>>>> ---
>>>>  arch/arm64/boot/dts/mediatek/mt8183.dtsi | 85 ++++++++++++++++++++++++
>>>>  1 file changed, 85 insertions(+)
>>>>
>>>> diff --git a/arch/arm64/boot/dts/mediatek/mt8183.dtsi b/arch/arm64/boot/dts/mediatek/mt8183.dtsi
>>>> index 10b32471bc7b..a2793cf3d994 100644
>>>> --- a/arch/arm64/boot/dts/mediatek/mt8183.dtsi
>>>> +++ b/arch/arm64/boot/dts/mediatek/mt8183.dtsi
>>>> @@ -570,6 +570,88 @@
>>>>  			status = "disabled";
>>>>  		};
>>>>  
>>>> +		thermal: thermal@...0b000 {
>>>> +			#thermal-sensor-cells = <1>;
>>>> +			compatible = "mediatek,mt8183-thermal";
>>>> +			reg = <0 0x1100b000 0 0x1000>;
>>>> +			interrupts = <0 76 IRQ_TYPE_LEVEL_LOW>;
>>>
>>> What is this interrupt for?
>>
>> The interrupts pin is designed in our SoC. But it is not used in our
>> upstream thermal code now. There is also add the settings but not use
>> for mt8173.dtsi. To align the thermal dtsi format, I follow the past
>> experience to add the interrupt settings of this project first.
> 
> Assuming the interrupt can be set by the driver to fire when a specified
> temperature is set, I suggest to change your driver to handle it so you
> can get rid of the polling waking up the SoC every second.
> 

For the record the interrupt is a required property by the binding description.

Regards,
Matthias