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

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Date:   Mon, 11 Dec 2023 12:59:09 +0000
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Roger Quadros <rogerq@...nel.org>
CC:     Conor Dooley <conor@...nel.org>,
        Swapnil Jakhade <sjakhade@...ence.com>, <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

On Mon, Dec 11, 2023 at 02:45:48PM +0200, Roger Quadros wrote:
> 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!

The existing second clock name (phy_en_refclk) might serve as
inspiration. What is the additional role that the second reference
serves?

> 
> > 
> >> +      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

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