net: stmmac: eic7700: make RGMII delay properties optional

Make rx-internal-delay-ps and tx-internal-delay-ps optional in the
EIC7700 DWMAC driver.

The driver previously required both properties to be present and would
fail probe when they were missing. This restricts valid hardware
configurations where RGMII timing is instead provided by the PHY or
board design.

Update the driver to treat missing delay properties as zero delay,
allowing systems without explicit MAC-side delay tuning to operate
correctly.

This aligns the driver behavior with the updated device tree binding
and provides a safe default configuration when MAC-side delay
programming is not required.

Signed-off-by: Zhi Li <lizhi2@eswincomputing.com>
Link: https://patch.msgid.link/20260707064218.1316-1-lizhi2@eswincomputing.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

0 files changed, 0 insertions, 0 deletions