linux-kernel - Re: [RFC PATCH v2 2/6] dt-bindings: mfd: bd96801 PMIC core

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Message-ID: <63d3891f-98d3-450f-967b-c72b0516b66b@gmail.com>
Date: Mon, 15 Apr 2024 09:24:41 +0300
From: Matti Vaittinen <mazziesaccount@...il.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc: Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Liam Girdwood <lgirdwood@...il.com>,
 Mark Brown <broonie@...nel.org>, Wim Van Sebroeck <wim@...ux-watchdog.org>,
 Guenter Roeck <linux@...ck-us.net>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org,
 Fabio Aiuto <fabio.aiuto@...icam.com>
Subject: Re: [RFC PATCH v2 2/6] dt-bindings: mfd: bd96801 PMIC core

On 4/15/24 08:50, Matti Vaittinen wrote:
> Morning Krzysztof,
> 
> Thanks again for the review/help!
> 
> On 4/14/24 00:33, Krzysztof Kozlowski wrote:
>> On 12/04/2024 13:21, Matti Vaittinen wrote
>>> +
>>> +  rohm,hw-timeout-ms:
>>> +    description:
>>> +      Watchdog timeout value(s). First walue is timeout limit. 
>>> Second value is
>>> +      optional value for 'too early' watchdog ping if window timeout 
>>> mode is
>>> +      to be used.
>>
>> Standard property timeout-sec does not work for you? It should allow two
>> items as well.
> 
> I don't think so. We need sub-second units. Furthermore, the timeout-sec 
> (if I understand it correctly) updates the "timeout policy", which tells 
> the expected ping-interval. This can be different from the "HW 
> heart-beat" which tells the HW's ping expectation. Hence the "hw-" prefix.

Oh, I just found out that this is an existing property. The ROHM 
BD9576/BD9573 do aleady use this. It seems I've had some discussion 
about it with Rob/Guenter when adding it. Frightening thing is that I 
didin't remember the discussion or that the property existed at all... 
Well, luckily we have lore :)

https://lore.kernel.org/all/c390476e4279d8b75de53271e9fb8948d8854528.camel@fi.rohmeurope.com/#r

(I don't see the final conclusion in this discussion, it has probably 
been done on some later version of the series).

Yours,
	-- Matti

-- 
Matti Vaittinen
Linux kernel developer at ROHM Semiconductors
Oulu Finland

~~ When things go utterly wrong vim users can always type :help! ~~