netdev - Re: [PATCH v4 5/5] dt-bindings: net: ipq4019-mdio: Document ipq5332 platform

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Date: Tue, 26 Dec 2023 12:21:56 +0000
From: Conor Dooley <conor@...nel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Jie Luo <quic_luoj@...cinc.com>, agross@...nel.org,
	andersson@...nel.org, konrad.dybcio@...aro.org, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org, andrew@...n.ch, hkallweit1@...il.com,
	linux@...linux.org.uk, robert.marko@...tura.hr,
	linux-arm-msm@...r.kernel.org, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	quic_srichara@...cinc.com
Subject: Re: [PATCH v4 5/5] dt-bindings: net: ipq4019-mdio: Document ipq5332
 platform

On Tue, Dec 26, 2023 at 10:28:09AM +0100, Krzysztof Kozlowski wrote:
> On 26/12/2023 08:25, Jie Luo wrote:

> >>> +  qcom,cmn-ref-clock-frequency:
> >>> +    $ref: /schemas/types.yaml#/definitions/uint32
> >>> +    enum:
> >>> +      - 25000000
> >>> +      - 31250000
> >>> +      - 40000000
> >>> +      - 48000000
> >>> +      - 50000000
> >>> +      - 96000000
> >>> +    default: 48000000
> >>> +    description: |
> >>> +      The reference clock source of CMN PLL block is selectable, the
> >>> +      reference clock source can be from wifi module or the external
> >>> +      xtal, the reference clock frequency 48MHZ can be from internal
> >>> +      wifi or the external xtal, if absent, the internal 48MHZ is used,
> >>> +      if the 48MHZ is specified, which means the external 48Mhz is used.
> >>
> >> This does not resolve mine and Conor's concerns from previous version.
> >> External clocks are defined as clock inputs.
> > 
> > No matter the external or internal reference clock, they are the clock
> > source selection for CMN, there are only 48MHZ can be external or 
> > internal, other clocks have the different clock rate, so the internal
> > 48MHZ reference clock can be implied when the 
> > "qcom,cmn-ref-clock-frequency" is not defined, which is suggested by 
> > Conor in the previous
> > comments.
> 
> I don't think he proposed it, but maybe I missed some message (care to
> point me to his message where he agreed on usage of
> qcom,cmn-ref-clock-frequency?). I am pretty sure we both stayed on the
> same page, that the presence of clocks defines choice of internal clock.
> This property should go away.

Exactly, I wanted this property to be removed. My suggestion was about
defaulting to the internal clock when the "clocks" property did not
contain the cmn ref clock.

> It is tiring to keep discussing this.

Yup.


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