linux-kernel - Re: [PATCH 1/5] dt-bindings: phy: cadence-torrent: Add second optional input reference clock

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Message-ID: <13c7fa70-ec60-44a7-aba7-5c4b0e21a755@kernel.org>
Date:   Mon, 11 Dec 2023 14:45:48 +0200
From:   Roger Quadros <rogerq@...nel.org>
To:     Conor Dooley <conor@...nel.org>,
        Swapnil Jakhade <sjakhade@...ence.com>
Cc:     vkoul@...nel.org, kishon@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, mparab@...ence.com, s-vadapalli@...com
Subject: Re: [PATCH 1/5] dt-bindings: phy: cadence-torrent: Add second
 optional input reference clock

Hi Conor,

On 24/07/2023 20:53, Conor Dooley wrote:
> On Mon, Jul 24, 2023 at 04:59:58PM +0200, Swapnil Jakhade wrote:
>> Torrent(SD0801) PHY supports two input reference clocks. Update bindings
>> to support dual reference clock multilink configurations.
>>
>> Signed-off-by: Swapnil Jakhade <sjakhade@...ence.com>
>> ---
>>  .../bindings/phy/phy-cadence-torrent.yaml     | 23 +++++++++++++------
>>  1 file changed, 16 insertions(+), 7 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/phy/phy-cadence-torrent.yaml b/Documentation/devicetree/bindings/phy/phy-cadence-torrent.yaml
>> index dfb31314face..ddb86ee0cebf 100644
>> --- a/Documentation/devicetree/bindings/phy/phy-cadence-torrent.yaml
>> +++ b/Documentation/devicetree/bindings/phy/phy-cadence-torrent.yaml
>> @@ -33,16 +33,25 @@ properties:
>>  
>>    clocks:
>>      minItems: 1
>> -    maxItems: 2
>> +    maxItems: 3
>>      description:
>> -      PHY reference clock for 1 item. Must contain an entry in clock-names.
>> -      Optional Parent to enable output reference clock.
>> +      PHY input reference clocks (refclk & refclk1).
> 
> "refclk" and "refclk1" don't seem like great names. What is each one
> used for & should refclk1 be renamed to match its use case?

All PHYs need one refclk input. "refclk"
Some PHY variants can take a second refclk input. Both are refclks so it was
chosen to add an "1" to the name to the 2nd refclk.
Please suggest if you have a better idea. Thanks!

> 
>> +      Optional Parent to enable output reference clock (phy_en_refclk).
>>  
>>    clock-names:
>> -    minItems: 1
>> -    items:
>> -      - const: refclk
>> -      - const: phy_en_refclk
>> +    oneOf:
>> +      - items:
>> +          - const: refclk
>> +      - items:
>> +          - const: refclk
>> +          - const: phy_en_refclk
>> +      - items:
>> +          - const: refclk
>> +          - const: refclk1
>> +      - items:
>> +          - const: refclk
>> +          - const: refclk1
>> +          - const: phy_en_refclk
>>  
>>    reg:
>>      minItems: 1
>> -- 
>> 2.34.1
>>

-- 
cheers,
-roger