netdev - Re: [PATCH net-next v3 2/6] net: phy: microchip_t1s: replace read-modify-write code with phy_modify

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Message-ID: <ZHBbVNWeKK2di73h@debian>
Date: Fri, 26 May 2023 09:10:12 +0200
From: Ramón Nordin Rodriguez <ramon.nordin.rodriguez@...roamp.se>
To: Parthiban.Veerasooran@...rochip.com
Cc: andrew@...n.ch, hkallweit1@...il.com, linux@...linux.org.uk,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Horatiu.Vultur@...rochip.com,
	Woojung.Huh@...rochip.com, Nicolas.Ferre@...rochip.com,
	Thorsten.Kummermehr@...rochip.com
Subject: Re: [PATCH net-next v3 2/6] net: phy: microchip_t1s: replace
 read-modify-write code with phy_modify_mmd

On Fri, May 26, 2023 at 05:48:25AM +0000, Parthiban.Veerasooran@...rochip.com wrote:
> Hi Ramon,
> > Nitpick, I think this block comment can be reduced to:
> > /* The following block deviates from AN1699 which states that a values
> >   * should be written back, even if unmodified.
> >   * Which is not necessary, so it's safe to use phy_modify_mmd here.*/
> > 
> >   The comment I added was intended to describe why I was doing weird
> >   things, but now I think it's more interesting to describe why we're
> >   deviating from the AN.
> > 
> >   Or the block comment could be dropped all togheter, I'm guessing no one
> >   is going to consult the AN if things 'just work'
> > 
> By consolidating all your comments in the other emails as well on this 
> 2nd patch, do you agree for my below proposal?
> 
> We will remove all block comments and simply put AN1699 reference as we 
> did for lan865x_revb0_config_init with a small addition on top of 
> phy_modify_mmd for loop? so the comment will look like below,
> 
> /* Reference to AN1699
>   * 
> https://ww1.microchip.com/downloads/aemDocuments/documents/AIS/ProductDocuments/SupportingCollateral/AN-LAN8670-1-2-config-60001699.pdf
>   * AN1699 says Read, Modify, Write, but the Write is not required if 
> the  register already has the required value. So it is safe to use 
> phy_modify_mmd here.
>   */
> 
> So in future, if someone wants to know about this configuration they can 
> simply refer the AN1699.
> 
> What do you think?
> 

I'm not sure about the link, resources have a tendency to move.
Otherwise LGTM

> Best Regards,
> Parthiban V