From: Andrew Lunn <andrew@lunn.ch>
To: Inochi Amaoto <inochiama@gmail.com>
Cc: Andrew Lunn <andrew+netdev@lunn.ch>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>, Yixun Lan <dlan@gentoo.org>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@foss.st.com>,
Richard Cochran <richardcochran@gmail.com>,
Paul Walmsley <pjw@kernel.org>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Alexandre Ghiti <alex@ghiti.fr>,
"Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>,
Yanteng Si <siyanteng@cqsoftware.com.cn>,
Yao Zi <ziyao@disroot.org>,
Vladimir Oltean <vladimir.oltean@nxp.com>,
Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>,
Choong Yong Liang <yong.liang.choong@linux.intel.com>,
Maxime Chevallier <maxime.chevallier@bootlin.com>,
Chen-Yu Tsai <wens@kernel.org>,
Shangjuan Wei <weishangjuan@eswincomputing.com>,
Boon Khai Ng <boon.khai.ng@altera.com>,
Quentin Schulz <quentin.schulz@cherry.de>,
Giuseppe Cavallaro <peppe.cavallaro@st.com>,
Jose Abreu <joabreu@synopsys.com>,
netdev@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
spacemit@lists.linux.dev,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org,
Longbin Li <looong.bin@gmail.com>
Subject: Re: [PATCH net-next 3/3] net: stmmac: Add glue layer for Spacemit K3 SoC
Date: Wed, 21 Jan 2026 02:29:23 +0100 [thread overview]
Message-ID: <cd5c882e-1632-4623-92d3-8a433c8ccdbb@lunn.ch> (raw)
In-Reply-To: <aXACRN7BaumIySp3@inochi.infowork>
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?
Andrew
next prev parent reply other threads:[~2026-01-21 1:29 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-20 4:36 [PATCH net-next 0/3] riscv: spacemit: Add ethernet support for K3 Inochi Amaoto
2026-01-20 4:36 ` [PATCH net-next 1/3] dt-bindings: net: Add support for Spacemit K3 dwmac Inochi Amaoto
2026-01-20 10:55 ` Yao Zi
2026-01-20 11:39 ` Inochi Amaoto
2026-01-20 13:48 ` Andrew Lunn
2026-01-20 22:31 ` Inochi Amaoto
2026-01-20 4:36 ` [PATCH net-next 2/3] net: stmmac: platform: Add snps,dwmac-5.40a IP compatible string Inochi Amaoto
2026-01-20 4:36 ` [PATCH net-next 3/3] net: stmmac: Add glue layer for Spacemit K3 SoC Inochi Amaoto
2026-01-20 4:56 ` Russell King (Oracle)
2026-01-20 5:05 ` Inochi Amaoto
2026-01-21 12:03 ` Russell King (Oracle)
2026-01-21 22:36 ` Inochi Amaoto
2026-01-21 23:56 ` Inochi Amaoto
2026-01-20 11:13 ` Yao Zi
2026-01-20 11:28 ` Russell King (Oracle)
2026-01-20 11:43 ` Inochi Amaoto
2026-01-20 11:32 ` Yixun Lan
2026-01-20 11:41 ` Inochi Amaoto
2026-01-20 13:56 ` Andrew Lunn
2026-01-20 22:36 ` Inochi Amaoto
2026-01-21 1:29 ` Andrew Lunn [this message]
2026-01-21 1:37 ` Inochi Amaoto
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