linux-kernel - Re: [PATCH v2 06/11] arm64: dts: exynos5433: add support for thermal trip irq-mode

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Date:   Tue, 13 Nov 2018 11:10:23 +0100
From:   Lukasz Luba <l.luba@...tner.samsung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, rui.zhang@...el.com, edubezval@...il.com,
        daniel.lezcano@...aro.org, robh+dt@...nel.org,
        mark.rutland@....com, corbet@....net,
        Bartłomiej Żołnierkiewicz 
        <b.zolnierkie@...sung.com>, kgene@...nel.org,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>
Subject: Re: [PATCH v2 06/11] arm64: dts: exynos5433: add support for
 thermal trip irq-mode

Hi Krzysztof,

On 11/12/18 10:00 AM, Krzysztof Kozlowski wrote:
> Thanks Lukasz for patches. I like your work!
> 
> I have few more comments which will probably apply for all the DTS commits.
> 
> On Wed, 7 Nov 2018 at 18:10, Lukasz Luba <l.luba@...tner.samsung.com> wrote:
>>
>> This patch adds support for new flag which indicates
> 
> This patch does not add support. Support for flag was added in your
> first drivers/thermal patches in this set. This patch adds new flag.
> (and does something more, so read on)
Got it, will change the commit message.
> 
>> that trip point triggers IRQ when temperature is met.
>> Exynos5433 supports 8 trip point which will trigger IRQ.
> 
> /8 trip point/8 trip points/
> 
>> Above that number other trip points should be registered
>> without 'irq-mode' flag.
> 
> Please fix the line-wrap.
OK
> 
>>
>> Cc: Kukjin Kim <kgene@...nel.org>
>> Cc: Krzysztof Kozlowski <krzk@...nel.org>
>> Cc: devicetree@...r.kernel.org
>> Cc: linux-arm-kernel@...ts.infradead.org
>> Cc: linux-samsung-soc@...r.kernel.org
>> Signed-off-by: Lukasz Luba <l.luba@...tner.samsung.com>
>> ---
>>   arch/arm64/boot/dts/exynos/exynos5433-tmu.dtsi | 105 ++++++++++++++++---------
>>   1 file changed, 70 insertions(+), 35 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/exynos/exynos5433-tmu.dtsi b/arch/arm64/boot/dts/exynos/exynos5433-tmu.dtsi
>> index fe3a0b1..c4330f6 100644
>> --- a/arch/arm64/boot/dts/exynos/exynos5433-tmu.dtsi
>> +++ b/arch/arm64/boot/dts/exynos/exynos5433-tmu.dtsi
>> @@ -17,37 +17,44 @@ thermal-zones {
>>                          atlas0_alert_0: atlas0-alert-0 {
>>                                  temperature = <65000>;  /* millicelsius */
>>                                  hysteresis = <1000>;    /* millicelsius */
>> -                               type = "active";
>> +                               type = "passive";
> 
> This change is not explained in commit msg.
> 
> Basically you are doing here two things (related to each other). You
> clearly define which trip points are IRQ-type and you correct the type
> of trip point. Active is incorrect. This second thing is missing in
> your commit msg and I believe it is main reason behind this patch. You
> should focus then on this reason - start from it. Subject could be
> like "Use proper passive type for thermal trip points".
> 
> Without this explanation I don't see the strong reason behind that
> patch. IOW, everything was working fine before... so why adding this
> new flag? Or maybe something was not fine... and then it is real
> reason why you are sending the patch. Usually commit message should
> answer to the most important question "WHY". Now, it explains
> "WHAT"... but I can see it from the source code. However from the code
> it is not easy to guess WHY.

OK, I will add the explanation 'why' similar to description from the
cover-letter to all the patches which add this flag in DT files.

> 
> Best regards,
> Krzysztof
> 
> 

Thank you for the review.

Regards,
Lukasz