linux-kernel - Re: [PATCH v5 1/1] dt-bindings: rtc: sophgo: add RTC support for Sophgo CV1800 series SoC

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Date: Mon, 8 Jan 2024 10:28:31 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Jingbao Qiu <qiujingbao.dlmu@...il.com>
Cc: a.zummo@...ertech.it, alexandre.belloni@...tlin.com, robh+dt@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 paul.walmsley@...ive.com, palmer@...belt.com, aou@...s.berkeley.edu,
 linux-rtc@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/1] dt-bindings: rtc: sophgo: add RTC support for
 Sophgo CV1800 series SoC

On 08/01/2024 10:10, Jingbao Qiu wrote:
> On Mon, Jan 8, 2024 at 4:04 PM Krzysztof Kozlowski
> <krzysztof.kozlowski@...aro.org> wrote:
>>
>> On 08/01/2024 08:22, Jingbao Qiu wrote:
>>> Add RTC devicetree binding for Sophgo CV1800 SoC.
>>>
>>> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>>> Signed-off-by: Jingbao Qiu <qiujingbao.dlmu@...il.com>
>>> ---
>>>  .../bindings/rtc/sophgo,cv1800-rtc.yaml       | 56 +++++++++++++++++++
>>>  1 file changed, 56 insertions(+)
>>>  create mode 100644 Documentation/devicetree/bindings/rtc/sophgo,cv1800-rtc.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/rtc/sophgo,cv1800-rtc.yaml b/Documentation/devicetree/bindings/rtc/sophgo,cv1800-rtc.yaml
>>> new file mode 100644
>>> index 000000000000..01a926cb5c81
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/rtc/sophgo,cv1800-rtc.yaml
>>> @@ -0,0 +1,56 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/rtc/sophgo,cv1800-rtc.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Real Time Clock of the Sophgo CV1800 SoC
>>> +
>>> +allOf:
>>> +  - $ref: rtc.yaml#
>>
>> Why the allOf has moved?
> 
> Hi,
> Do you mean allof should be under maintainers? Or other meanings.

Yes and the patch which got my review had it correctly placed.

> 
>>
>>> +
>>> +maintainers:
>>> +  - Jingbao Qiu <qiujingbao.dlmu@...il.com>
>>> +
>>> +description:
>>> +  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. In addition, the hardware state
>>> +  machine provides triggering and timing control for chip
>>> +  power on, off, and reset.
>>> +
>>> +properties:
>>> +  compatible:
>>> +    items:
>>> +      - const: sophgo,cv1800-rtc
>>> +      - const: syscon
>>
>> Why is this syscon? Description does not explain this.
> 
> Because the driver of the submodule POR in RTC only requires register
> address and range to work, according to what you said, it is only a compatible
> attribute and does not need to be a child node.

What child node has anything to do with syscon? Anyway I don't
understand that.

> 
> So I wrote the following in the changelog.
> 
> - add syscon attribute to share registers
>   with POR

Where is this syscon attribute? Please point me to specific line in DTS
and in the driver.

Best regards,
Krzysztof