On Tue, Sep 26, 2023 at 09:30:54PM +0900, Yoshihiro Shimoda wrote:
> Fix the MPIC.PSMCS value following the programming example in the
> section 6.4.2 Management Data Clock (MDC) Setting, Ethernet MAC IP,
> S4 Hardware User Manual Rev.1.00.
>
> The value is calculated by
> MPIC.PSMCS = clk[MHz] / (MDC frequency[MHz] * 2) - 1
> with the input clock frequency from clk_get_rate() and MDC frequency
> of 2.5MHz. Otherwise, this driver cannot communicate PHYs on the R-Car
> S4 Starter Kit board.
>
> Fixes: 3590918b5d07 ("net: ethernet: renesas: Add support for "Ethernet Switch"")
> Reported-by: Tam Nguyen <tam.nguyen.xa@xxxxxxxxxxx>
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> Tested-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
Reviewed-by: Andrew Lunn <andrew@xxxxxxx>
Andrew
