linux-kernel - Re: [PATCH v3 1/2] dt-bindings: net: motorcomm: Add pad driver strength cfg

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Date:   Tue, 20 Jun 2023 15:29:04 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Guo Samin <samin.guo@...rfivetech.com>
Cc:     Conor Dooley <conor@...nel.org>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, netdev@...r.kernel.org,
        Peter Geis <pgwipeout@...il.com>,
        Frank <Frank.Sae@...or-comm.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Yanhong Wang <yanhong.wang@...rfivetech.com>
Subject: Re: [PATCH v3 1/2] dt-bindings: net: motorcomm: Add pad driver
 strength cfg

> I just got the detailed data of Driver Strength(DS) from Motorcomm ,
> which applies to both rx_clk and rx_data.
> 
> |----------------------|
> |     ds map table     |
> |----------------------|
> | DS(3b) | Current (mA)|
> |--------|-------------|
> |   000  |     1.20    |
> |   001  |     2.10    |
> |   010  |     2.70    |
> |   011  |     2.91    |
> |   100  |     3.11    |
> |   101  |     3.60    |
> |   110  |     3.97    |
> |   111  |     4.35    |
> |--------|-------------|
>
> Since these currents are not integer values

Integers is not a problem. Simply use uA.

> and have no regularity, it is not very good to use in the drive/dts
> in my opinion.

I think they are fine to use. Add a lookup table, microamps to
register value. Return -EINVAL if the requested value is not in the
table. List the valid values in the schema, so the checker tool might
point out problems.

      Andrew