netdev - Re: [PATCH net-next 3/3] net: stmmac: Add glue layer for Spacemit K3 SoC

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Message-ID: <aXAtMZJorEBiK2R-@inochi.infowork>
Date: Wed, 21 Jan 2026 09:37:53 +0800
From: Inochi Amaoto <inochiama@...il.com>
To: Andrew Lunn <andrew@...n.ch>, Inochi Amaoto <inochiama@...il.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Yixun Lan <dlan@...too.org>, 
	Maxime Coquelin <mcoquelin.stm32@...il.com>, Alexandre Torgue <alexandre.torgue@...s.st.com>, 
	Richard Cochran <richardcochran@...il.com>, Paul Walmsley <pjw@...nel.org>, 
	Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
	Alexandre Ghiti <alex@...ti.fr>, "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>, 
	Yanteng Si <siyanteng@...oftware.com.cn>, Yao Zi <ziyao@...root.org>, 
	Vladimir Oltean <vladimir.oltean@....com>, Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>, 
	Choong Yong Liang <yong.liang.choong@...ux.intel.com>, Maxime Chevallier <maxime.chevallier@...tlin.com>, 
	Chen-Yu Tsai <wens@...nel.org>, Shangjuan Wei <weishangjuan@...incomputing.com>, 
	Boon Khai Ng <boon.khai.ng@...era.com>, Quentin Schulz <quentin.schulz@...rry.de>, 
	Giuseppe Cavallaro <peppe.cavallaro@...com>, Jose Abreu <joabreu@...opsys.com>, netdev@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org, 
	spacemit@...ts.linux.dev, linux-stm32@...md-mailman.stormreply.com, 
	linux-arm-kernel@...ts.infradead.org, Longbin Li <looong.bin@...il.com>
Subject: Re: [PATCH net-next 3/3] net: stmmac: Add glue layer for Spacemit K3
 SoC

On Wed, Jan 21, 2026 at 02:29:23AM +0100, Andrew Lunn wrote:
> On Wed, Jan 21, 2026 at 06:36:01AM +0800, Inochi Amaoto wrote:
> > On Tue, Jan 20, 2026 at 02:56:26PM +0100, Andrew Lunn wrote:
> > > > +/* Note: the delay step value is at 0.1ps */
> > > > +static const unsigned int k3_delay_step_10x[4] = {
> > > > +	367, 493, 559, 685
> > > > +};
> > > 
> > > Am i reading it correctly that RGMII delays are limited to these four
> > > values?
> > > 
> > > If so, please add this list to the DT binding.
> > > 
> > 
> > No, these value are just adjustment interval, and it is also
> > controlled by another code register, the final delay is calculated
> > by the following formula:
> > 
> > delay = delay_step * delay_code * 0.9;
> > 
> > So the delay configuration needs to be calculated instead of
> > directly assigned.
> 
> O.K.
> 
> So what is the actual range? Can is do 1000ps? 2000ps? 3000ps? Should
> there be a basic range check to avoid dumb typos?

It can have a pretty big ranges, and I was told the total delay is fine
to work between [1200, 2800]. I guess it is fine for us to check the
upper limit?

Regards,
Inochi