linux-kernel - Re: [PATCH] net: phy: DP83822: enable rgmii mode if phy_interface_is

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Date:   Thu, 19 May 2022 21:00:40 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Michael Nazzareno Trimarchi <michael@...rulasolutions.com>
Cc:     Tommaso Merciai <tommaso.merciai@...rulasolutions.com>,
        Alberto Bianchi <alberto.bianchi@...rulasolutions.com>,
        linuxfancy@...glegroups.com,
        linux-amarula <linux-amarula@...rulasolutions.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: phy: DP83822: enable rgmii mode if
 phy_interface_is_rgmii

On Thu, May 19, 2022 at 08:29:26PM +0200, Michael Nazzareno Trimarchi wrote:
> Hi
> 
> Il gio 19 mag 2022, 20:24 Tommaso Merciai <tommaso.merciai@...rulasolutions.com
> > ha scritto:
> 
>     RGMII mode can be enable from dp83822 straps, and also writing bit 9
>     of register 0x17 - RMII and Status Register (RCSR).
>     When phy_interface_is_rgmii this mode must be enabled
> 
>     References:
>      - https://www.ti.com/lit/gpn/dp83822i p66
> 
>     Signed-off-by: Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
>     Co-developed-by: Michael Trimarchi <michael@...rulasolutions.com>
>     Suggested-by: Alberto Bianchi <alberto.bianchi@...rulasolutions.com>
>     Tested-by: Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
>     ---
>      drivers/net/phy/dp83822.c | 4 ++++
>      1 file changed, 4 insertions(+)
> 
>     diff --git a/drivers/net/phy/dp83822.c b/drivers/net/phy/dp83822.c
>     index ce17b2af3218..66fa61fb86db 100644
>     --- a/drivers/net/phy/dp83822.c
>     +++ b/drivers/net/phy/dp83822.c
>     @@ -408,6 +408,10 @@ static int dp83822_config_init(struct phy_device
>     *phydev)
>                             if (err)
>                                     return err;
>                     }
>     +
>     +               /* Enable RGMII Mode */
>     +               phy_set_bits_mmd(phydev, DP83822_DEVADDR,
>     +                                       MII_DP83822_RCSR, BIT(9));
>             }
> 
> 
> 
> Please define bit 9 and this break other connection. Introduce again the switch
> for phy interface connection

Hi guys

Please try to perform your own reviews before posting to the list.

I agree with an #define for BIT(9).

However, i don't understand what you mean by the rest of your
comments. Please make sure your colleges understand you.

	  Andrew