netdev - Re: [PATCH V2 net-next 2/2] net: dsa: bcm_sf2: setup BCM4908 internal crossbar

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Message-ID: <dba93972-27c2-116c-c188-7ddb41eaf02b@gmail.com>
Date:   Fri, 12 Mar 2021 09:22:53 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Rafał Miłecki <zajec5@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: Re: [PATCH V2 net-next 2/2] net: dsa: bcm_sf2: setup BCM4908 internal
 crossbar

On 3/12/21 2:41 AM, Rafał Miłecki wrote:
> From: Rafał Miłecki <rafal@...ecki.pl>
> 
> On some SoCs (e.g. BCM4908, BCM631[345]8) SF2 has an integrated
> crossbar. It allows connecting its selected external ports to internal
> ports. It's used by vendors to handle custom Ethernet setups.
> 
> BCM4908 has following 3x2 crossbar. On Asus GT-AC5300 rgmii is used for
> connecting external BCM53134S switch. GPHY4 is usually used for WAN
> port. More fancy devices use SerDes for 2.5 Gbps Ethernet.
> 
>               ┌──────────┐
> SerDes ─── 0 ─┤          │
>               │   3x2    ├─ 0 ─── switch port 7
>  GPHY4 ─── 1 ─┤          │
>               │ crossbar ├─ 1 ─── runner (accelerator)
>  rgmii ─── 2 ─┤          │
>               └──────────┘
> 
> Use setup data based on DT info to configure BCM4908's switch port 7.
> Right now only GPHY and rgmii variants are supported. Handling SerDes
> can be implemented later.
> 
> Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>

Acked-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian