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Date: Mon, 8 Jan 2024 10:28:53 +0100
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Subject: Re: [PATCH v5 0/1] dt-bindings: riscv: sophgo: add RTC for CV1800
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To: Jingbao Qiu <qiujingbao.dlmu@gmail.com>
Cc: a.zummo@towertech.it, alexandre.belloni@bootlin.com, robh+dt@kernel.org,
 krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org,
 paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu,
 linux-rtc@vger.kernel.org, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org
References: <20240108072253.30183-1-qiujingbao.dlmu@gmail.com>
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From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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On 08/01/2024 10:11, Jingbao Qiu wrote:
> On Mon, Jan 8, 2024 at 5:06 PM Krzysztof Kozlowski
> <krzysztof.kozlowski@linaro.org> wrote:
>>
>> On 08/01/2024 10:00, Jingbao Qiu wrote:
>>> On Mon, Jan 8, 2024 at 4:02 PM Krzysztof Kozlowski
>>> <krzysztof.kozlowski@linaro.org> wrote:
>>>>
>>>> On 08/01/2024 08:22, Jingbao Qiu wrote:
>>>>> Real Time Clock (RTC) is an independently powered module
>>>>> within the chip, which includes a 32KHz oscillator and
>>>>> a Power On Reset/POR submodule. It can be used for time
>>>>> display and timed alarm generation.
>>>>>
>>>>> Power On Reset/POR submodule only using register resources
>>>>> so it should be empty. The 32KHz oscillator only provides
>>>>> pulses for RTC in hardware.
>>>>>
>>>>>
>>>>> Changes since v4:
>>>>> - remove POR dt-bindings because it empty
>>>>> - remove MFD dt-bindings because SoC does
>>>>>   not have MFDs
>>>>> - add syscon attribute to share registers
>>>>>   with POR
>>>>>
>>>>> v4: https://lore.kernel.org/all/20231229090643.116575-1-qiujingbao.dlmu@gmail.com/
>>>>>
>>>>> Changes since v3:
>>>>> - temporarily not submitting RTC driver code
>>>>>   waiting for communication with IC designer
>>>>
>>>> Hm, why?
>>>>
>>>> We do not need bindings if nothing matches to them. If this binding is
>>>> for other upstream open-source project, please provide references.
>>>>
>>>> See also:
>>>> https://elixir.bootlin.com/linux/v6.7-rc8/source/Documentation/devicetree/bindings/submitting-patches.rst#L61
>>>>
>>>
>>> Hi!
>>>
>>> There is a function in the RTC driver code used to calibrate the
>>> clock, which is define in the datasheet.
>>> However, Alexandre Belloni raised concerns that clock calibration
>>> should be done using GPS or similar
>>> methods, rather than using other clock sources. I think what he said
>>> makes sense. So it is necessary
>>> to communicate with IC designers.
>>>
>>> link: https://lore.kernel.org/all/202312271350242a208426@mail.local/
>>
>> Sure, this I get, but why sending bindings alone? There is no user of them.
>>
> 
> Thank you for your patient reply.
> May I ask if this user refers to driver code or DTS?

Anything. Any user.

Best regards,
Krzysztof