On Wed, Jul 17, 2019 at 02:57:39PM +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 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> What about adding a short comment explaining the situation?
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