linux-kernel - Re: [PATCH v2] net: phy: DP83822: enable rgmii mode if phy_interface_is

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Date:   Thu, 19 May 2022 20:53:46 +0200
From:   Michael Nazzareno Trimarchi <michael@...rulasolutions.com>
To:     Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
Cc:     alberto.bianchi@...rulasolutions.com,
        linux-amarula@...rulasolutions.com, linuxfancy@...glegroups.com,
        Andrew Lunn <andrew@...n.ch>,
        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@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: phy: DP83822: enable rgmii mode if phy_interface_is_rgmii

Hi Tommaso

On Thu, May 19, 2022 at 8:50 PM Tommaso Merciai
<tommaso.merciai@...rulasolutions.com> wrote:
>
> 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 rgmii mode must be enabled, same for
> contrary, this prevents malconfigurations of hw straps
>
> 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>
> ---
> Changes since v1:
>  - Improve commit msg
>  - Add definition of bit 9 reg rcsr (rgmii mode en)
>  - Handle case: phy_interface_is_rgmii is false
>
>  drivers/net/phy/dp83822.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/drivers/net/phy/dp83822.c b/drivers/net/phy/dp83822.c
> index ce17b2af3218..7cb9d084707b 100644
> --- a/drivers/net/phy/dp83822.c
> +++ b/drivers/net/phy/dp83822.c
> @@ -94,6 +94,9 @@
>  #define DP83822_WOL_INDICATION_SEL BIT(8)
>  #define DP83822_WOL_CLR_INDICATION BIT(11)
>
> +/* RCSR bits */
> +#define DP83822_RGMII_MODE_EN  BIT(9)
> +
>  /* RSCR bits */
>  #define DP83822_RX_CLK_SHIFT   BIT(12)
>  #define DP83822_TX_CLK_SHIFT   BIT(11)

BIT(9) should go here

#define DP83822_RGMII_MODE_EN  BIT(9)
#define DP83822_RX_CLK_SHIFT   BIT(12)
#define DP83822_TX_CLK_SHIFT   BIT(11)

You duplicate the comments up.

> @@ -408,6 +411,12 @@ static int dp83822_config_init(struct phy_device *phydev)
>                         if (err)
>                                 return err;
>                 }
> +
> +               phy_set_bits_mmd(phydev, DP83822_DEVADDR,
> +                                       MII_DP83822_RCSR, DP83822_RGMII_MODE_EN);
> +       } else {
> +               phy_clear_bits_mmd(phydev, DP83822_DEVADDR,
> +                                       MII_DP83822_RCSR, DP83822_RGMII_MODE_EN);
>         }
>
>         if (dp83822->fx_enabled) {
> --
> 2.25.1
>

Michael

-- 
Michael Nazzareno Trimarchi
Co-Founder & Chief Executive Officer
M. +39 347 913 2170
michael@...rulasolutions.com
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