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

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Message-ID: <20220609200444.GA14557-robh@kernel.org>
Date:   Thu, 9 Jun 2022 14:04:44 -0600
From:   Rob Herring <robh@...nel.org>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Andrew Lunn <andrew@...n.ch>, Dan Murphy <dmurphy@...com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next 1/3] dt-bindings: dp83867: add binding for
 io_impedance_ctrl nvmem cell

On Mon, 06 Jun 2022 22:22:18 +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>
> ---
>  .../devicetree/bindings/net/ti,dp83867.yaml    | 18 +++++++++++++++---
>  1 file changed, 15 insertions(+), 3 deletions(-)
> 

Reviewed-by: Rob Herring <robh@...nel.org>