On Mon, Jul 29, 2019 at 10:03:56AM +0200, Simon Horman wrote:
> * According to the R-Car Gen3 Hardware Manual Errata for Rev 1.00 of
> August 24, 2018, the TX clock internal delay mode isn't supported
> on R-Car E3 (r8a77990) and D3 (r8a77995).
>
> * TX clock internal delay mode is required for reliable 1Gbps communication
> using the KSZ9031RNX phy present on the Ebisu and Draak boards.
>
> Thus, the E3 based Ebisu and D3 based Draak boards can not reliably
> use 1Gbps and the speed should be limited to 100Mbps.
>
> Based on work by Kazuya Mizuguchi.
>
> Signed-off-by: Simon Horman <horms+renesas@xxxxxxxxxxxx>
Reviewed-by: Andrew Lunn <andrew@xxxxxxx>
Andrew
