1 // SPDX-License-Identifier: GPL-2.0 OR MIT
2 /*
3 * Copyright (C) 2021 StarFive Technology Co., Ltd.
4 * Copyright (C) 2021 Emil Renner Berthing <kernel@esmil.dk>
5 */
6
7 /dts-v1/;
8 #include "jh7100-common.dtsi"
9
10 / {
11 model = "StarFive VisionFive V1";
12 compatible = "starfive,visionfive-v1", "starfive,jh7100";
13
14 gpio-restart {
15 compatible = "gpio-restart";
16 gpios = <&gpio 63 GPIO_ACTIVE_HIGH>;
17 priority = <224>;
18 };
19 };
20
21 &gmac {
22 phy-handle = <&phy>;
23 };
24
25 /*
26 * The board uses a Motorcomm YT8521 PHY supporting RGMII-ID, but requires
27 * manual adjustment of the RX internal delay to work properly. The default
28 * RX delay provided by the driver (1.95ns) is too high, but applying a 50%
29 * reduction seems to mitigate the issue.
30 *
31 * It is worth noting the adjustment is not necessary on BeagleV Starlight SBC,
32 * which uses a Microchip PHY. Hence, most likely the Motorcomm PHY is the one
33 * responsible for the misbehaviour, not the GMAC.
34 */
35 &mdio {
36 phy: ethernet-phy@0 {
37 reg = <0>;
38 rx-internal-delay-ps = <900>;
39 };
40 };
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