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arm64: dts: lx2160abluebox3: update RGMII delays for sja1105 switch

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In the new behavior, the sja1105 driver expects there to be explicit
RGMII delays present on the fixed-link ports, otherwise it will complain
that it falls back to legacy behavior, which is to apply RGMII delays
incorrectly derived from the phy-mode string.

In this case, the legacy behavior of the driver is to apply both RX and
TX delays. To preserve that, add explicit 2 nanosecond delays, which are
identical with what the driver used to add (a 90 degree phase shift).
The delays from the phy-mode are ignored by new kernels (it's still
RGMII as long as it's "rgmii*" something), and the explicit
{rx,tx}-internal-delay-ps properties are ignored by old kernels, so the
change works both ways.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Vladimir Oltean 2021-10-20 14:36:13 +03:00 • committed by Shawn Guo
parent e691f9282a
commit 25501d8d3a
1 changed files with 4 additions and 0 deletions
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4
arch/arm64/boot/dts/freescale/fsl-lx2160a-bluebox3.dts
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@ -386,6 +386,8 @@
reg = <2>;
ethernet = <&dpmac17>;
phy-mode = "rgmii-id";
rx-internal-delay-ps = <2000>;
tx-internal-delay-ps = <2000>;
fixed-link {
speed = <1000>;
@ -529,6 +531,8 @@
reg = <2>;
ethernet = <&dpmac18>;
phy-mode = "rgmii-id";
rx-internal-delay-ps = <2000>;
tx-internal-delay-ps = <2000>;
fixed-link {
speed = <1000>;