linux-kernel - Re: [PATCH v3 5/5] drivers/rtc/rtc-s5m.c: add support for S2MPS15 RTC

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Message-id: <56303DA3.5020306@samsung.com>
Date:	Wed, 28 Oct 2015 08:44:43 +0530
From:	Alim Akhtar <alim.akhtar@...sung.com>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Mark Brown <broonie@...nel.org>
Cc:	lee.jones@...aro.org, mturquette@...libre.com,
	linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/5] drivers/rtc/rtc-s5m.c: add support for S2MPS15 RTC

Hello,

On 10/28/2015 07:47 AM, Krzysztof Kozlowski wrote:
> On 28.10.2015 10:53, Mark Brown wrote:
>> On Wed, Oct 28, 2015 at 10:29:56AM +0900, Krzysztof Kozlowski wrote:
>>
>>> If that's true, then don't add new compatibles, new names etc. Re-use.
>>> No new code needed, no changes needed. Keep it simple.
>>
>> Well, it depends - it can be useful to get the information about it
>> being a different part into DT so that if in future we realise that
>> there is some difference (perhaps a bug workaround even if the IP is
>> intended to be the same).  Though in the case of a MFD that information
>> can be obtained from the MFD for the device.
>
> We can always differentiate later and introduce new compatible.
> Declaring a compatible right now would be useful only if we really cared
> about using the workaround on older DTBs.
>
> Since I cannot judge the difference (I don't have the datasheet of
> S2MPS15) then I don't see the need of adding new compatible/name for the
> "same device".
>
> Of course maybe there is such need? Alim?
>
Well I did think of keeping the changes as minimal as possible, like 
just have "{ "s2mps15-rtc",        S2MPS14X }", since I don't have 
access to s2mps14 UM, I could not confirm that s2mps14 and s2mps15 are 
exactly the same w.r.t rtc block. So I proposed the current changes.

Well I do agree with Mark here, a name/compatible matching with the pmic 
is good to at least avoid confusion while looking at the sysfs.

> Best regards,
> Krzysztof
>
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