netdev - Re: [PATCH net v2] net: ethernet: renesas: rswitch Fix PHY station management clock setting

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Date: Tue, 26 Sep 2023 12:12:38 +0300
From: Sergey Shtylyov <s.shtylyov@....ru>
To: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>, <s.shtylyov@....ru>,
	<davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>
CC: <netdev@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>, Tam Nguyen
	<tam.nguyen.xa@...esas.com>, Kuninori Morimoto
	<kuninori.morimoto.gx@...esas.com>
Subject: Re: [PATCH net v2] net: ethernet: renesas: rswitch Fix PHY station
 management clock setting

Hello!

   You missed a colon after rswitch.
   And historically we used simpler prefixes, like just sh_eth or ravb...

On 9/26/23 11:11 AM, 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@...esas.com>
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> Tested-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
[...]

MBR, Sergey