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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Yixun Lan , Maxime Coquelin , Alexandre Torgue , Richard Cochran , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , "Russell King (Oracle)" , Yanteng Si , Yao Zi , Vladimir Oltean , Lad Prabhakar , Choong Yong Liang , Maxime Chevallier , Chen-Yu Tsai , Shangjuan Wei , Boon Khai Ng , Quentin Schulz , Giuseppe Cavallaro , Jose Abreu , 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 Subject: Re: [PATCH net-next 3/3] net: stmmac: Add glue layer for Spacemit K3 SoC Message-ID: References: <20260120043609.910302-1-inochiama@gmail.com> <20260120043609.910302-4-inochiama@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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