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

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Date:   Thu, 9 Jan 2020 09:07:32 +0000
From:   Christophe ROULLIER <christophe.roullier@...com>
To:     Maxime Ripard <mripard@...nel.org>
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 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@...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 ?

Thanks

> Maxime