netdev - Re: [PATCH 1/2] dt-bindings: net: dwmac: increase 'maxItems' for 'clocks', 'clock-names' properties

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Date:   Fri, 15 Nov 2019 08:50:08 +0100
From:   Maxime Ripard <mripard@...nel.org>
To:     Christophe ROULLIER <christophe.roullier@...com>
Cc:     "davem@...emloft.net" <davem@...emloft.net>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "martin.blumenstingl@...glemail.com" 
        <martin.blumenstingl@...glemail.com>,
        "alexandru.ardelean@...log.com" <alexandru.ardelean@...log.com>,
        "narmstrong@...libre.com" <narmstrong@...libre.com>,
        "mcoquelin.stm32@...il.com" <mcoquelin.stm32@...il.com>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/2] dt-bindings: net: dwmac: increase 'maxItems' for
 'clocks', 'clock-names' properties

On Fri, Nov 08, 2019 at 01:02:14PM +0000, Christophe ROULLIER wrote:
> On 11/8/19 11:42 AM, Maxime Ripard wrote:
> > Hi,
> >
> > On Fri, Nov 08, 2019 at 11:35:25AM +0100, Christophe Roullier wrote:
> >> This change is needed for some soc based on snps,dwmac, which have
> >> more than 3 clocks.
> >>
> >> Signed-off-by: Christophe Roullier <christophe.roullier@...com>
> >> ---
> >>   Documentation/devicetree/bindings/net/snps,dwmac.yaml | 8 +++++++-
> >>   1 file changed, 7 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> >> index 4845e29411e4..376a531062c2 100644
> >> --- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> >> +++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> >> @@ -27,6 +27,7 @@ select:
> >>             - snps,dwmac-3.710
> >>             - snps,dwmac-4.00
> >>             - snps,dwmac-4.10a
> >> +          - snps,dwmac-4.20a
> >>             - snps,dwxgmac
> >>             - snps,dwxgmac-2.10
> >>
> >> @@ -62,6 +63,7 @@ properties:
> >>           - snps,dwmac-3.710
> >>           - snps,dwmac-4.00
> >>           - snps,dwmac-4.10a
> >> +        - snps,dwmac-4.20a
> >>           - snps,dwxgmac
> >>           - snps,dwxgmac-2.10
> >>
> >> @@ -87,7 +89,8 @@ properties:
> >>
> >>     clocks:
> >>       minItems: 1
> >> -    maxItems: 3
> >> +    maxItems: 5
> >> +    additionalItems: true
> > Those additional clocks should be documented
> >
> > Maxime
>
> Hi Maxime,
>
> The problem it is specific to our soc, so is it possible to
>
> propose "optional clock" for 2 extras clocks in snps,dwmac.yaml
>
> and "official" description in soc yaml file (stm32-dwmac.yaml) ?
>
>    clocks:
>      minItems: 1
>      maxItems: 5
>      additionalItems: true
>      items:
>        - description: GMAC main clock
>        - description: Peripheral registers interface clock
>        - description:
>            PTP reference clock. This clock is used for programming the
>            Timestamp Addend Register. If not passed then the system
>            clock will be used and this is fine on some platforms.
>
> +      - description: optional clock
>
> +      - description: optional clock

I guess we'd really need to figure out what those clocks are doing,
they are probably helpful (and used, under a different name) by
others.

Hopefully the questions Rob asked will clear that out

Maxime

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