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

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Date:   Tue, 14 Jun 2022 20:46:48 +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

On Mon, Jun 06, 2022 at 10:22:18PM +0200, Rasmus Villemoes wrote:
> We have a board where measurements indicate that the current three
> options - leaving IO_IMPEDANCE_CTRL at the (factory calibrated) reset
> value or using one of the two boolean properties to set it to the
> min/max value - are too coarse.
> 
> There is no documented mapping from the 32 possible values of the
> IO_IMPEDANCE_CTRL field to values in the range 35-70 ohms, and the
> exact mapping is likely to vary from chip to chip. So add a DT binding
> for an nvmem cell which can be populated during production with a
> value suitable for each specific board.
> 
> Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>

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

    Andrew