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SubjectRe: [PATCH v2 1/5] dt-bindings: phy: cadence-torrent: Add optional input reference clock for PLL1
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On 14/12/2023 08:02, Swapnil Kashinath Jakhade wrote:
> Hi Krzysztof,
>
>> -----Original Message-----
>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>> Sent: Wednesday, December 13, 2023 12:19 PM
>> To: Swapnil Kashinath Jakhade <sjakhade@cadence.com>; vkoul@kernel.org;
>> kishon@kernel.org; robh+dt@kernel.org; krzysztof.kozlowski+dt@linaro.org;
>> conor+dt@kernel.org; linux-phy@lists.infradead.org; linux-
>> kernel@vger.kernel.org; devicetree@vger.kernel.org
>> Cc: Milind Parab <mparab@cadence.com>; rogerq@kernel.org; s-
>> vadapalli@ti.com
>> Subject: Re: [PATCH v2 1/5] dt-bindings: phy: cadence-torrent: Add optional
>> input reference clock for PLL1
>>
>> EXTERNAL MAIL
>>
>>
>> On 12/12/2023 12:48, Swapnil Jakhade wrote:
>>> Torrent PHY can have two input reference clocks. Update bindings
>>
>> It already supports two.
>>
>
> Thanks for your comments.
> refclk and pll1_refclk are the two input reference clocks for the PLLs.
> phy_en_refclk is used to enable output reference clock in some cases.

Why input clock is used to enable output reference clock?

>
>>> to support dual reference clock multilink configurations.
>>>
>>> Signed-off-by: Swapnil Jakhade <sjakhade@cadence.com>
>>> ---
>>> .../devicetree/bindings/phy/phy-cadence-torrent.yaml | 6 +++---
>>> 1 file changed, 3 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/phy/phy-cadence-
>> torrent.yaml b/Documentation/devicetree/bindings/phy/phy-cadence-
>> torrent.yaml
>>> index dfb31314face..98946f549895 100644
>>> --- a/Documentation/devicetree/bindings/phy/phy-cadence-torrent.yaml
>>> +++ b/Documentation/devicetree/bindings/phy/phy-cadence-torrent.yaml
>>> @@ -35,14 +35,14 @@ properties:
>>> minItems: 1
>>> maxItems: 2
>>> 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 & pll1_refclk (optional).
>>> + Optional Parent to enable output reference clock (phy_en_refclk).
>>
>> So third clock? But you allow only two? Confusing.
>>
>
> Yes, if both refclk and pll1_refclk are present, phy_en_refclk can't be used.
>
>>>
>>> clock-names:
>>> minItems: 1
>>> items:
>>> - const: refclk
>>> - - const: phy_en_refclk
>>> + - enum: [ pll1_refclk, phy_en_refclk ]
>>
>> This does not match your commit msg. You already had two clocks there.
>>
> Yes, but refclk was the single input reference clock used for PLLs earlier.
> As stated in commit message, a new input reference clock (pll1_refclk) is added here.

existing phy_en_refclk is also input reference clock, isn't it?

>

Best regards,
Krzysztof

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