linux-kernel - Re: [PATCH v7 4/4] thermal: mediatek: add another get

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Date:   Mon, 5 Dec 2022 20:39:29 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Amjad Ouled-Ameur <aouledameur@...libre.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Amit Kucheria <amitk@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Zhang Rui <rui.zhang@...el.com>
Cc:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Fabien Parent <fparent@...libre.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Markus Schneider-Pargmann <msp@...libre.com>,
        linux-pm@...r.kernel.org, Rob Herring <robh@...nel.org>,
        Michael Kao <michael.kao@...iatek.com>,
        linux-kernel@...r.kernel.org, Hsin-Yi Wang <hsinyi@...omium.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v7 4/4] thermal: mediatek: add another get_temp ops for
 thermal sensors


Hi Amjad,


On 05/12/2022 11:41, Amjad Ouled-Ameur wrote:

[ ... ]

>>> @@ -1161,11 +1197,24 @@ static int mtk_thermal_probe(struct platform_device *pdev)
>>>    
>>>    	platform_set_drvdata(pdev, mt);
>>>    
>>> -	tzdev = devm_thermal_of_zone_register(&pdev->dev, 0, mt,
>>> -					      &mtk_thermal_ops);
>>> -	if (IS_ERR(tzdev)) {
>>> -		ret = PTR_ERR(tzdev);
>>> -		goto err_disable_clk_peri_therm;
>>> +	for (i = 0; i < mt->conf->num_sensors + 1; i++) {
>>> +		tz = devm_kmalloc(&pdev->dev, sizeof(*tz), GFP_KERNEL);
>>> +		if (!tz)
>>> +			return -ENOMEM;
>>> +
>>> +		tz->mt = mt;
>>> +		tz->id = i;
>>> +
>>> +		tzdev = devm_thermal_of_zone_register(&pdev->dev, i, tz, (i == 0) ?
>>> +							     &mtk_thermal_ops :
>>> +							     &mtk_thermal_sensor_ops);
>>
>> Here you use again the aggregation
> I addressed this concern in V6, could you please take a look and let me
> know what you think [0].
> 
> [0]: https://lore.kernel.org/all/5eb0cdc2-e9f9-dd42-bf80-b7dcd8bcc196@baylibre.com/

May I misunderstanding but AFAICS, this patch is setting the 
mtk_thermal_ops if the sensor id is zero. The get_temp is computing the 
max temperature in this ops which is what we don't want to do.


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