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arm64: dts: ti: k3-am642-{evm,sk}: add ti,min-output-impedance

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The default impedance for the MAC I/O lines from the DP83867 Ethernet PHY
is 50 Ohm. Based on the board PCB traces, this impedance is relatively
higher than expected, resulting in CRC errors for packets being transmitted
and received. Hence, add the "ti,min-output-impedance" device-tree property
to set the impedance to its lowest possible value of 35 Ohm as described in
the DP83867 Datasheet [0].

[0]: https://www.ti.com/lit/ds/symlink/dp83867e.pdf

Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Link: https://patch.msgid.link/20260223105448.1110428-2-s-vadapalli@ti.com
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
This commit is contained in:
Siddharth Vadapalli 2026-02-23 16:24:12 +05:30 committed by Vignesh Raghavendra
parent 3865126f0e
commit 2870e4deda
2 changed files with 3 additions and 0 deletions
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1
arch/arm64/boot/dts/ti/k3-am642-evm.dts
View File

@ -601,6 +601,7 @@ cpsw3g_phy0: ethernet-phy@0 {
reg = <0>;
ti,rx-internal-delay = <DP83867_RGMIIDCTL_2_00_NS>;
ti,fifo-depth = <DP83867_PHYCR_FIFO_DEPTH_4_B_NIB>;
ti,min-output-impedance;
};
};

2
arch/arm64/boot/dts/ti/k3-am642-sk.dts
View File

@ -519,12 +519,14 @@ cpsw3g_phy0: ethernet-phy@0 {
reg = <0>;
ti,rx-internal-delay = <DP83867_RGMIIDCTL_2_00_NS>;
ti,fifo-depth = <DP83867_PHYCR_FIFO_DEPTH_4_B_NIB>;
ti,min-output-impedance;
};
cpsw3g_phy1: ethernet-phy@1 {
reg = <1>;
ti,rx-internal-delay = <DP83867_RGMIIDCTL_2_00_NS>;
ti,fifo-depth = <DP83867_PHYCR_FIFO_DEPTH_4_B_NIB>;
ti,min-output-impedance;
};
};