linux-kernel - Re: [PATCH v3 2/2] dt-bindings: net: snps,dwmac: add clk

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Date:   Thu, 22 Sep 2022 10:15:22 +0800
From:   Jianguo Zhang <jianguo.zhang@...iatek.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "David S . Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
CC:     Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Biao Huang <biao.huang@...iatek.com>, <netdev@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v3 2/2] dt-bindings: net: snps,dwmac: add clk_csr
 property

Dear Krzysztof,

	Thanks for your comment.

On Wed, 2022-09-21 at 10:24 +0200, Krzysztof Kozlowski wrote:
> On 21/09/2022 09:07, Jianguo Zhang wrote:
> > Add clk_csr property for snps,dwmac
> > 
> > Signed-off-by: Jianguo Zhang <jianguo.zhang@...iatek.com>
> > ---
> >  Documentation/devicetree/bindings/net/snps,dwmac.yaml | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> > b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> > index 491597c02edf..8cff30a8125d 100644
> > --- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> > +++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> > @@ -288,6 +288,11 @@ properties:
> >        is supported. For example, this is used in case of SGMII and
> >        MAC2MAC connection.
> >  
> > +  clk_csr:
> 
> No underscores in node names. Missing vendor prefix.
> 
We will remane the property name 'clk_csr' as 'snps,clk-csr' and
another driver patch is needed to align the name used in driver with
the new name. 
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    description:
> > +      Frequency division factor for MDC clock.
> 
> Can't common clock framework do the job? What is the MDC clock?
> 
MDC clock is used for ethernet MAC accessing PHY register by MDIO bus.
There is frequency divider designed in ethernet internal HW to ensure
that ethernet can get correct frequency of MDC colck and the vlaue of
frequency divider can be got from DTS.
> Best regards,
> Krzysztof

BRS
Jianguo