netdev - Re: [PATCH v2 net-next v2 10/12] net: dsa: mv88e6xxx: iterate on compatible info

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Message-ID: <20160614214658.GG12832@lunn.ch>
Date:	Tue, 14 Jun 2016 23:46:58 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel@...oirfairelinux.com,
	"David S. Miller" <davem@...emloft.net>,
	Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH v2 net-next v2 10/12] net: dsa: mv88e6xxx: iterate on
 compatible info

On Tue, Jun 14, 2016 at 02:31:51PM -0400, Vivien Didelot wrote:
> With legacy probing, we cannot have a compatible info structure. We have
> to guess it. Instead of using only the first info structure of the info
> table, iterate over the compatible data.
> 
> That way, the legacy code will support new compatible chips with
> different register access without requiring any code change.

I don't think this is safe when used in combination with multi-chip
addresses. This code will perform writes on various addresses,
addresses which could be real registers on a device.

I don't see a need to support guessing. The new binding will work,
without any guessing. So use that.

	Andrew