linux-kernel - Re: [PATCH v2 1/3] dt-bindings: net: fsl-fec add mdc/mdio bitbang option

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Message-ID: <20201129230416.GT2234159@lunn.ch>
Date:   Mon, 30 Nov 2020 00:04:16 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Adrien Grassein <adrien.grassein@...il.com>
Cc:     fugang.duan@....com, davem@...emloft.net, kuba@...nel.org,
        robh+dt@...nel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] dt-bindings: net: fsl-fec add mdc/mdio bitbang
 option

On Sun, Nov 29, 2020 at 11:51:43PM +0100, Adrien Grassein wrote:
> Hi Andrew,
> 
> Please find my answers below.
> 
> Le dim. 29 nov. 2020 à 23:41, Andrew Lunn <andrew@...n.ch> a écrit :
> 
>     On Sun, Nov 29, 2020 at 10:59:58PM +0100, Adrien Grassein wrote:
>     > Add dt-bindings explanation for the two new gpios
>     > (mdio and mdc) used for bitbanging.
> 
>     Hi Adrien
> 
>     What is missing is an explanation of why!
> 
> I'm sorry, it's my first upstreaming attempt.

Hi Adrien

Please take a look at

https://www.kernel.org/doc/html/latest/networking/netdev-FAQ.html

It is normal to have a patch 0/X which explains the big picture.

Then the commit message for each patch should explain why you are
doing something. That is much more important than what you are doing,
i can see that from the patch itself.

> I am currently upstreaming the "Nitrogen 8m Mini board" that seems to not use a
> "normal" mdio bus but a "bitbanged" one with the fsl fec driver.

Any idea why?

Anyway, you should not replicate code, don't copy bitbanging code into
the FEC. Just use the existing bit-banger MDIO bus master driver.

	   Andrew