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From:   Rob Herring <robh+dt@kernel.org>
Date:   Thu, 9 Jan 2020 15:34:20 -0600
Message-ID: <CAL_JsqLQoo0RMtdKgYbWP=wUiO6z2QM7tVzGJv_iMekFKQUDiQ@mail.gmail.com>
Subject: Re: [PATCH 1/2] dt-bindings: net: dwmac: increase 'maxItems' for
 'clocks', 'clock-names' properties
To:     Christophe ROULLIER <christophe.roullier@st.com>
Cc:     Maxime Ripard <mripard@kernel.org>,
        "davem@davemloft.net" <davem@davemloft.net>,
        "mark.rutland@arm.com" <mark.rutland@arm.com>,
        "martin.blumenstingl@googlemail.com" 
        <martin.blumenstingl@googlemail.com>,
        "alexandru.ardelean@analog.com" <alexandru.ardelean@analog.com>,
        "narmstrong@baylibre.com" <narmstrong@baylibre.com>,
        "mcoquelin.stm32@gmail.com" <mcoquelin.stm32@gmail.com>,
        Alexandre TORGUE <alexandre.torgue@st.com>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
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        <linux-stm32@st-md-mailman.stormreply.com>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>
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On Thu, Jan 9, 2020 at 3:07 AM Christophe ROULLIER
<christophe.roullier@st.com> wrote:
>
> On 15/11/2019 08:50, Maxime Ripard wrote:
> > 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@st.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
>
> Rob, do you have any ideas, suggestions ?

Answer my questions from patch 2:

> What does 'power mode' mean? IIRC, some DW MACs have a clock for WoL
> called LPI or something. Are you sure this is ST specific and not DW
> config or version specific?