linux-kernel - Re: [net-next PATCH v2 08/15] dt-bindings: net: dsa: qca8k: Add MAC swap and clock phase properties

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Date:   Sat, 9 Oct 2021 19:07:16 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Matthew Hagan <mnhagan88@...il.com>
Subject: Re: [net-next PATCH v2 08/15] dt-bindings: net: dsa: qca8k: Add MAC
 swap and clock phase properties

On Fri, Oct 08, 2021 at 02:22:18AM +0200, Ansuel Smith wrote:
> Add names and decriptions of additional PORT0_PAD_CTRL properties.
> Document new binding qca,mac6_exchange that exchange the mac0 port
> with mac6.
> qca,sgmii-(rx|tx)clk-falling-edge are for setting the respective clock
> phase to failling edge.
> 
> Signed-off-by: Matthew Hagan <mnhagan88@...il.com>
> Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> ---
>  Documentation/devicetree/bindings/net/dsa/qca8k.txt | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/dsa/qca8k.txt b/Documentation/devicetree/bindings/net/dsa/qca8k.txt
> index 9383d6bf2426..208ee5bc1bbb 100644
> --- a/Documentation/devicetree/bindings/net/dsa/qca8k.txt
> +++ b/Documentation/devicetree/bindings/net/dsa/qca8k.txt
> @@ -13,6 +13,11 @@ Required properties:
>  Optional properties:
>  
>  - reset-gpios: GPIO to be used to reset the whole device
> +- qca,mac6-exchange: Internally swap MAC0 with MAC6.
> +- qca,sgmii-rxclk-falling-edge: Set the receive clock phase to falling edge.
> +                                Mostly used in qca8327 with CPU port 0 set to
> +                                sgmii.
> +- qca,sgmii-txclk-falling-edge: Set the transmit clock phase to falling edge.
>  - qca,rgmii0-1-8v: Set the internal regulator to supply 1.8v for MAC0 port.
>                     This is needed for qca8337 and toggles the supply voltage
>                     from 1.5v to 1.8v. For the specific regs it was observed

The edge configuration is a port configuration. So it should be inside
the port DT node it applies to. That also gives a clean way forward
when a new switch appears with more SGMII interfaces, each with its
own edge configuration.

But that then leads into the MAC0/MAC6 swap mess. I need to think
about that some more, how do we cleanly describe that in DT.

      Andrew