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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: spacemit@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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. > > +static int spacemit_dwmac_detected_delay_value(unsigned int delay, > > + unsigned int *config) > > +{ > > + int i; > > + int code, best_code = 0; > > + unsigned int best_delay = 0; > > + unsigned int best_config = 0; > > + > > + if (delay == 0) > > + return 0; > > + > > + for (i = 0; i < ARRAY_SIZE(k3_delay_step_10x); i++) { > > + unsigned int step = k3_delay_step_10x[i]; > > + > > + for (code = 1; code <= MAX_DLINE_DELAY_CODE; code++) { > > + /* > > + * Note K3 require a specific factor for calculate > > + * the delay, in this scenario it is 0.9. So the > > + * formula is code * step / 10 * 0.9 > > + */ > > + unsigned int tmp = code * step * 9 / 10 / 10; > > + > > + if (abs(tmp - delay) < abs(best_delay - delay)) { > > + best_code = code; > > + best_delay = tmp; > > + best_config = i; > > + } > > + } > > + } > > With the four values listed in DT, i would make this a straight match, > not the nearest, and return -EINVAL otherwise. > > Andrew Regards, Inochi