The StarFive VisionFive V1 SBC has a Motorcomm YT8521 PHY supporting
RGMII-ID, but requires manual adjustment of the RX internal delay to
work properly.
The default RX delay provided by the driver is 1.95 ns, which proves to
be too high. Applying a 50% reduction seems to mitigate the issue.
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@xxxxxxxxxxxxx>
---
.../starfive/jh7100-starfive-visionfive-v1.dts | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/arch/riscv/boot/dts/starfive/jh7100-starfive-visionfive-v1.dts b/arch/riscv/boot/dts/starfive/jh7100-starfive-visionfive-v1.dts
index e82af72f1aaf..e043a27f7612 100644
--- a/arch/riscv/boot/dts/starfive/jh7100-starfive-visionfive-v1.dts
+++ b/arch/riscv/boot/dts/starfive/jh7100-starfive-visionfive-v1.dts
@@ -18,3 +18,20 @@ gpio-restart {
priority = <224>;
};
};
+
+&gmac {
+ phy-handle = <&phy>;
+ phy-mode = "rgmii-id";
+ status = "okay";
+
+ mdio {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "snps,dwmac-mdio";
+
+ phy: ethernet-phy@0 {
+ reg = <0>;
+ rx-internal-delay-ps = <900>;
+ };
+ };
+};
--
2.42.0
