linux-kernel - Re: [PATCH 9/9] mfd: sec-irq: Do not enforce (incorrect) interrupt trigger type

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Date:   Mon, 21 Dec 2020 08:36:02 +0100
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Lee Jones <lee.jones@...aro.org>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sylwester Nawrocki <snawrocki@...nel.org>
Subject: Re: [PATCH 9/9] mfd: sec-irq: Do not enforce (incorrect) interrupt
 trigger type

Hi Krzysztof,

On 18.12.2020 15:22, Krzysztof Kozlowski wrote:
> On Fri, Dec 18, 2020 at 02:25:39PM +0100, Marek Szyprowski wrote:
>> On 10.12.2020 22:29, Krzysztof Kozlowski wrote:
>>> Interrupt line can be configured on different hardware in different way,
>>> even inverted.  Therefore driver should not enforce specific trigger
>>> type - edge falling - but instead rely on Devicetree to configure it.
>>>
>>> The Samsung PMIC drivers are used only on Devicetree boards.
>>>
>>> Additionally, the PMIC datasheets describe the interrupt line as active
>>> low with a requirement of acknowledge from the CPU therefore the edge
>>> falling is not correct.
>>>
>>> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
>> Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>
>>
>> It looks that this together with DTS change fixes RTC alarm failure that
>> I've observed from time to time on TM2e board!
> Great! I'll add this to the commit msg.
>
> Thanks for testing.

BTW, while playing with this, maybe it would make sense to fix the 
reported interrupt type for the PMIC sub-interrupts:

# grep s2mps /proc/interrupts
120:          0      gpa0   7 Level     s2mps13
121:          0   s2mps13  10 Edge      rtc-alarm0

Best regards

-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland