netdev - Re: [PATCH 1/2] Docs/devicetree: add serdes-output-amplitude to marvell.txt

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Date:   Fri, 26 Nov 2021 17:08:30 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Holger Brunck <holger.brunck@...achienergy.com>
Cc:     netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH 1/2] Docs/devicetree: add serdes-output-amplitude to
 marvell.txt

On Fri, Nov 26, 2021 at 04:42:48PM +0100, Holger Brunck wrote:
> This can be configured from the device tree. Add this property to the
> documentation accordingly.
> The eight different values added in the dt-bindings file correspond to
> the values we can configure on 88E6352, 88E6240 and 88E6176 switches
> according to the datasheet.
> 
> CC: Andrew Lunn <andrew@...n.ch>
> CC: Jakub Kicinski <kuba@...nel.org>
> Signed-off-by: Holger Brunck <holger.brunck@...achienergy.com>
> ---
>  .../devicetree/bindings/net/dsa/marvell.txt    |  3 +++
>  include/dt-bindings/net/mv-88e6xxx.h           | 18 ++++++++++++++++++
>  2 files changed, 21 insertions(+)
>  create mode 100644 include/dt-bindings/net/mv-88e6xxx.h
> 
> diff --git a/Documentation/devicetree/bindings/net/dsa/marvell.txt b/Documentation/devicetree/bindings/net/dsa/marvell.txt
> index 2363b412410c..bff397a2dc49 100644
> --- a/Documentation/devicetree/bindings/net/dsa/marvell.txt
> +++ b/Documentation/devicetree/bindings/net/dsa/marvell.txt
> @@ -46,6 +46,9 @@ Optional properties:
>  - mdio?		: Container of PHYs and devices on the external MDIO
>  			  bus. The node must contains a compatible string of
>  			  "marvell,mv88e6xxx-mdio-external"
> +- serdes-output-amplitude: Configure the output amplitude of the serdes
> +			   interface.
> +    serdes-output-amplitude = <MV88E6352_SERDES_OUT_AMP_210MV>;

Please make this actually millivolts, not an enum. Have the property
called serdes-output-amplitude-mv. The driver should convert from a mv
value to whatever value you need to write to the register, or return
-EINVAL.

	Andrew