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From:   Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
To:     "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Emil Renner Berthing <kernel@esmil.dk>,
        Samin Guo <samin.guo@starfivetech.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Alexandre Torgue <alexandre.torgue@foss.st.com>,
        Jose Abreu <joabreu@synopsys.com>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        Richard Cochran <richardcochran@gmail.com>,
        Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc:     netdev@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
        linux-stm32@st-md-mailman.stormreply.com,
        linux-arm-kernel@lists.infradead.org, kernel@collabora.com
Subject: [PATCH v2 11/12] riscv: dts: starfive: visionfive-v1: Enable gmac and setup phy
Date:   Sun, 29 Oct 2023 06:27:11 +0200
Message-ID: <20231029042712.520010-12-cristian.ciocaltea@collabora.com>
In-Reply-To: <20231029042712.520010-1-cristian.ciocaltea@collabora.com>
References: <20231029042712.520010-1-cristian.ciocaltea@collabora.com>
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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@collabora.com>
---
 .../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