linux-kernel - Re: [PATCH 2/3] dt-bindings: rtc: Add Mstar SSD20xD RTC devicetree bindings documentation

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Date:   Wed, 31 May 2023 08:49:07 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Daniel Palmer <daniel@...f.com>
Cc:     Romain Perier <romain.perier@...il.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>, linux-rtc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/3] dt-bindings: rtc: Add Mstar SSD20xD RTC devicetree
 bindings documentation

On 31/05/2023 01:12, Daniel Palmer wrote:
> Hi Krzysztof,
> 
> On Tue, 30 May 2023 at 17:01, Krzysztof Kozlowski <krzk@...nel.org> wrote:
>>> This is
>>> exactly the case for rtc-msc313e and it was not an issue.
>>
>> So that was my question - can it be anything else? There is literally no
>> description of the hardware... Neither in commit msg nor in description:
>> field in bindings.
> 
> This RTC block is a block inside of the SSD201/SSD202D (they are the

But what is SSD201?

> same die with different memory attached) and is only found there.
> The documentation we have for this is literally one page in a PDF that
> says "RTC registers".
> It could be an IP block licensed from somewhere and technically have a
> better name but right now all we know is this RTC block is the one in
> that chip and that chip is the first known instance of it.
> 
> Say we manage to get the ethernet mainlined at some point: That's a
> lot easier as we know already it's a hacked up version of the cadence
> macb so the compatible can be "macb something".
> 
>>>> What about interrupt line?
>>>
>>> There is currently no interrupt right now, we have not yet the irqchip
>>> code for handling the alarm irq of this rtc block.
>>
>> So you are going to change the hardware and add the interrupt line? We
>> do not talk about drivers, but hardware. Whether your driver handles it
>> or not, matters less.
>>
>> Describe the hardware, not the current implementation of one driver.
> 
> We don't really know how the interrupt is wired up in the hardware properly yet.

OK

Best regards,
Krzysztof