linux-kernel - Re: [PATCH] ARM: dts: BCM5301X: Change Ethernet switch management port

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Date:   Wed, 13 Feb 2019 09:07:29 +0100
From:   Rafał Miłecki <zajec5@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     Hauke Mehrtens <hauke@...ke-m.de>,
        "maintainer:BROADCOM BCM5301X ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@...adcom.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: dts: BCM5301X: Change Ethernet switch management
 port

On 13.02.2019 05:25, Florian Fainelli wrote:
> BCM5301X has 3 Ethernet controllers: GMAC0, 1, 2 which map to ports 5, 7
> and 8 respectively of the internal switch. Future changes will turn on
> management mode in the Ethernet switch driver (b53) which will require
> us to use port 8.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>   arch/arm/boot/dts/bcm4708-smartrg-sr400ac.dts | 11 ++++++++---
>   1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/bcm4708-smartrg-sr400ac.dts b/arch/arm/boot/dts/bcm4708-smartrg-sr400ac.dts
> index 3fced3b7f1a8..affa9cc7422d 100644
> --- a/arch/arm/boot/dts/bcm4708-smartrg-sr400ac.dts
> +++ b/arch/arm/boot/dts/bcm4708-smartrg-sr400ac.dts
> @@ -150,10 +150,15 @@
>   			label = "wan";
>   		};
>   
> -		port@5 {
> -			reg = <5>;
> +		port@8 {
> +			reg = <8>;
>   			label = "cpu";
> -			ethernet = <&gmac0>;
> +			ethernet = <&gmac2>;
> +
> +			fixed-link {
> +				speed = <1000>;
> +				full-duplex;
> +			};
>   		};
>   	};
>   };

I'm not exactly sure how Linux switch driver works, but from DT
perspective I think we should rather have *hardware* described instead
of a common Linux case.

If I'm right, we should rather have all 3 switch ports described (5, 7,
8) and have Linux just use the one it needs.