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 21:47:51 +0800
From: Jingbao Qiu <qiujingbao.dlmu@...il.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
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 Mon, Jan 8, 2024 at 5:28 PM Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> 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.
>

Thank you for your reply. I will adjust their order.

> >
> >>
> >>> +
> >>> +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.

I will explain in the next version of DTS.
Thank you again for your patient reply.

Best regards,
Jingbao Qiu