Re: [PATCH net-next 1/3] dt-bindings: dp83867: add binding for io_impedance_ctrl nvmem cell

Rob Herring
2022-06-09T20:04:53Z

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@rasmusvillemoes.dk>
> ---
> .../devicetree/bindings/net/ti,dp83867.yaml | 18 +++++++++++++++---
> 1 file changed, 15 insertions(+), 3 deletions(-)
>

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