linux-kernel - Re: [PATCH net-next 1/3] dt-bindings: dp83867: add binding for io_impedance

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Message-ID: <Yp54aOPqd5weWnFt@lunn.ch>
Date:   Mon, 6 Jun 2022 23:58:00 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     netdev@...r.kernel.org, Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Dan Murphy <dmurphy@...com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/3] dt-bindings: dp83867: add binding for
 io_impedance_ctrl nvmem cell

> There is no documented mapping from the 32 possible values of the
> IO_IMPEDANCE_CTRL field to values in the range 35-70 ohms

There have been a few active TI engineers submitting patches to TI PHY
drivers. Please could you reach out to them and ask if they can
provide documentation.

Having magic values in DT is not the preferred why to use it. Ideally
you should store Ohms in the cell and convert to the register value.

    Andrew