netdev - Re: [PATCH v2 1/5] net: dsa: mv88e6xxx: introduce support for two chips using direct smi addressing

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Message-ID: <20190524141311.GJ2979@lunn.ch>
Date:   Fri, 24 May 2019 16:13:11 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Rasmus Villemoes <rasmus.villemoes@...vas.dk>
Cc:     Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Rasmus Villemoes <Rasmus.Villemoes@...vas.se>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/5] net: dsa: mv88e6xxx: introduce support for two
 chips using direct smi addressing

On Fri, May 24, 2019 at 09:00:24AM +0000, Rasmus Villemoes wrote:
> The 88e6250 (as well as 6220, 6071, 6070, 6020) do not support
> multi-chip (indirect) addressing. However, one can still have two of
> them on the same mdio bus, since the device only uses 16 of the 32
> possible addresses, either addresses 0x00-0x0F or 0x10-0x1F depending
> on the ADDR4 pin at reset [since ADDR4 is internally pulled high, the
> latter is the default].
> 
> In order to prepare for supporting the 88e6250 and friends, introduce
> mv88e6xxx_info::dual_chip to allow having a non-zero sw_addr while
> still using direct addressing.
> 
> Signed-off-by: Rasmus Villemoes <rasmus.villemoes@...vas.dk>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew