netdev - Re: [PATCH 1/9] net: dsa: allow switch drivers to override default slave PHY addresses

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Date:   Mon, 14 Nov 2022 09:51:36 +0100
From:   Lukasz Majewski <lukma@...x.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        Matthias Schiffer <matthias.schiffer@...tq-group.com>
Subject: Re: [PATCH 1/9] net: dsa: allow switch drivers to override default
 slave PHY addresses

Hi Andrew,

> > It depends if the HW designer set this bootstrap pin low or high :-)
> > (often this pin is not concerned until mainline/BSP driver is not
> > working :-) )
> > 
> > As it costs $ to fix this - it is easier to add "quirk" to the
> > code.  
> 
> Can you read the strapping configuration via the scratch registers?
> Then you can detect it at probe time and do the right thing.
> 

This is how I do it, yes. My impression is that some DTS descriptions
have this hardcoded instead.

>      Andrew




Best regards,

Lukasz Majewski

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