netdev - Re: [PATCH net v3] rswitch: Fix PHY station management clock setting

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Date: Thu, 28 Sep 2023 16:15:47 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Cc: s.shtylyov@....ru, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, 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 v3] rswitch: Fix PHY station management clock setting

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@...esas.com>
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> Tested-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew