Re: [PATCH net-next v2 1/2] dt-bindings: net: pcs: renesas,rzn1-miic: Add renesas,miic-phylink-active-low property

[Rob Herring (Arm)]

On Fri, 09 Jan 2026 14:22:49 +0000, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
> 
> Add the renesas,miic-phylink-active-low property to allow configuring the
> active level of PHY link status signals provided by the MIIC block.
> 
> EtherPHY link-up and link-down status is required as a hardware feature
> independent of whether GMAC or ETHSW is used. With GMAC, link status is
> obtained via MDC/MDIO and handled in software. In contrast, ETHSW exposes
> dedicated PHY link pins that provide this information directly in
> hardware.
> 
> These PHY link signals are required not only for host-controlled traffic
> but also for switch-only forwarding paths where frames are exchanged
> between external nodes without CPU involvement. This is particularly
> important for redundancy protocols such as DLR (Device Level Ring),
> which depend on fast detection of link-down events caused by cable or
> port failures. Handling such events purely in software introduces
> latency, which is why ETHSW provides dedicated hardware link pins.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
> ---
> v1->v2:
> - Updated commit message to elaborate the necessity of PHY link signals.
> ---
>  .../devicetree/bindings/net/pcs/renesas,rzn1-miic.yaml     | 7 +++++++
>  1 file changed, 7 insertions(+)
> 

Acked-by: Rob Herring (Arm) <robh@xxxxxxxxxx>