linux-kernel - Re: [PATCH net-next v2] dt-bindings: net: ti: k3-am654-cpsw-nuss: Document Serdes PHY

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Message-ID: <7b6e8131-8e5b-88bc-69f7-b737c0c35bb6@ti.com>
Date:   Wed, 8 Mar 2023 14:08:01 +0530
From:   Siddharth Vadapalli <s-vadapalli@...com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <krzysztof.kozlowski+dt@...aro.org>
CC:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <linux@...linux.org.uk>, <pabeni@...hat.com>, <robh+dt@...nel.org>,
        <nsekhar@...com>, <rogerq@...nel.org>, <netdev@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <srk@...com>,
        <s-vadapalli@...com>
Subject: Re: [PATCH net-next v2] dt-bindings: net: ti: k3-am654-cpsw-nuss:
 Document Serdes PHY

Hello Krzysztof,

On 08/03/23 14:04, Krzysztof Kozlowski wrote:
> On 08/03/2023 06:18, Siddharth Vadapalli wrote:
>> Update bindings to include Serdes PHY as an optional PHY, in addition to
>> the existing CPSW MAC's PHY. The CPSW MAC's PHY is required while the
>> Serdes PHY is optional. The Serdes PHY handle has to be provided only
>> when the Serdes is being configured in a Single-Link protocol. Using the
>> name "serdes-phy" to represent the Serdes PHY handle, the am65-cpsw-nuss
>> driver can obtain the Serdes PHY and request the Serdes to be
>> configured.
>>
>> Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
>> ---
>>
>> Hello,
>>
>> This patch corresponds to the Serdes PHY bindings that were missed out in
>> the series at:
>> https://lore.kernel.org/r/20230104103432.1126403-1-s-vadapalli@ti.com/
>> This was pointed out at:
>> https://lore.kernel.org/r/CAMuHMdW5atq-FuLEL3htuE3t2uO86anLL3zeY7n1RqqMP_rH1g@mail.gmail.com/
>>
>> Changes from v1:
>> 1. Describe phys property with minItems, items and description.
>> 2. Use minItems and items in phy-names.
>> 3. Remove the description in phy-names.
>>
>> v1:
>> https://lore.kernel.org/r/20230306094750.159657-1-s-vadapalli@ti.com/
>>
>>  .../bindings/net/ti,k3-am654-cpsw-nuss.yaml        | 14 ++++++++++++--
>>  1 file changed, 12 insertions(+), 2 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/net/ti,k3-am654-cpsw-nuss.yaml b/Documentation/devicetree/bindings/net/ti,k3-am654-cpsw-nuss.yaml
>> index 900063411a20..0fb48bb6a041 100644
>> --- a/Documentation/devicetree/bindings/net/ti,k3-am654-cpsw-nuss.yaml
>> +++ b/Documentation/devicetree/bindings/net/ti,k3-am654-cpsw-nuss.yaml
>> @@ -126,8 +126,18 @@ properties:
>>              description: CPSW port number
>>  
>>            phys:
>> -            maxItems: 1
>> -            description: phandle on phy-gmii-sel PHY
>> +            minItems: 1
>> +            items:
>> +              - description: CPSW MAC's PHY.
>> +              - description: Serdes PHY. Serdes PHY is required only if
>> +                             the Serdes has to be configured in the
>> +                             Single-Link configuration.
>> +
>> +          phy-names:
>> +            minItems: 1
>> +            items:
>> +              - const: mac-phy
>> +              - const: serdes-phy
> 
> Drop "phy" suffixes.

The am65-cpsw driver fetches the Serdes PHY by looking for the string
"serdes-phy". Therefore, modifying the string will require changing the driver's
code as well. Please let me know if it is absolutely necessary to drop the phy
suffix. If so, I will post a new series with the changes involving dt-bindings
changes and the driver changes.

Regards,
Siddharth.