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

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Message-id: <5630A3E2.9010207@samsung.com>
Date:	Wed, 28 Oct 2015 16:00:58 +0530
From:	Alim Akhtar <alim.akhtar@...sung.com>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	Mark Brown <broonie@...nel.org>, 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: [rtc-linux] Re: [PATCH v3 5/5] drivers/rtc/rtc-s5m.c: add support
 for S2MPS15 RTC

Hi Alexandre,

On 10/28/2015 03:18 PM, Alexandre Belloni wrote:
> On 28/10/2015 at 12:31:43 +0900, Krzysztof Kozlowski wrote :
>> The s2mps13 clock driver added new name and compatible... which was
>> probably totally unneeded (I missed that during review). We don't have
>> to make this as a rule...
>>
>> Since we do not have any data about future workarounds and the
>> differences then just follow Ockham's razor - use the same name and
>> compatible.
>>
>
> So you don't care about DT backward compatibility because when a
> workaround will be needed for one of the IPs, then you will have to
> update the old dtb to use it.
>
> Unless you are sure that the IP is the same, doing
>
> { "s2mps15-rtc",	S2MPS14X },
>
> is probably the best way to handle that. Note that I personally don't
> care about the DT ABI, I'm just pointing out what may happen ;)
>
Thats what my point is, anyway I am still looking into the fine prints 
of the s2mps15 and s2mps14 user manual, now I have found at least one 
difference in their one of the register bit, which might be a good 
reason to keep s2mps15-rtc device.
Will update the same in v4.
Thanks,

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