linux-kernel - Re: [PATCH v2 3/3] ARM: orion5x: Add D-Link DNS-323 based on Device Tree

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Date:   Fri, 23 Sep 2022 20:02:26 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     maukka@....kapsi.fi, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, arnd@...db.de, olof@...om.net,
        sebastian.hesselbarth@...il.com, gregory.clement@...tlin.com,
        linux@...linux.org.uk, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 3/3] ARM: orion5x: Add D-Link DNS-323 based on Device
 Tree

On Friday 23 September 2022 14:12:24 Andrew Lunn wrote:
> > > > +	if (of_machine_is_compatible("dlink,dns323a1")) {
> > > > +		writel(0, MPP_DEV_CTRL);		/* DEV_D[31:16] */
> > > 
> > > I spotted this in dns323-setup.c as well. Do you have any idea what it
> > > does?
> > > 
> > 
> > No idea. I have tried to replicate what was in dns323-setup.c as exactly as
> > possible.
> > I can try to leave it out and see if anything changes.
> 
> It is best to keep what we don't understand. It will be there for a
> reason.
> 
> 	Andrew

Hello! I tried to index all publicly available Marvell SoC
documentations into kernel documentation subfolder:
https://docs.kernel.org/arm/marvell.html

For Orion there is linked Datasheet and User Manual, so you could try to
find in those documents that mentioned register and check what it is
doing.