linux-kernel - Re: [RFC PATCH 2/2] net: phy: mxl-gpy: add new device tree property to disable SGMII autoneg

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Date: Tue, 23 Apr 2024 14:23:04 +0100
From: Simon Horman <horms@...nel.org>
To: Stefan Eichenberger <eichest@...il.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, robh@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	lxu@...linear.com, andrew@...n.ch, hkallweit1@...il.com,
	linux@...linux.org.uk, michael@...le.cc, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/2] net: phy: mxl-gpy: add new device tree property
 to disable SGMII autoneg

On Tue, Apr 16, 2024 at 02:10:32PM +0200, Stefan Eichenberger wrote:
> Add a new device tree property to disable SGMII autonegotiation and
> instead use the option to match the SGMII speed to what was negotiated
> on the twisted pair interface (tpi). This allows us to disable SGMII
> autonegotiation on Ethernet controllers that are not compatible with
> this mode.
> 
> Signed-off-by: Stefan Eichenberger <eichest@...il.com>
> ---
>  drivers/net/phy/mxl-gpy.c | 18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/mxl-gpy.c b/drivers/net/phy/mxl-gpy.c
> index b2d36a3a96f1..4147b4c29eaf 100644
> --- a/drivers/net/phy/mxl-gpy.c
> +++ b/drivers/net/phy/mxl-gpy.c
> @@ -114,6 +114,7 @@ struct gpy_priv {
>  	 * is enabled.
>  	 */
>  	u64 lb_dis_to;
> +	bool sgmii_match_tpi_speed;
>  };
>  
>  static const struct {
> @@ -262,8 +263,17 @@ static int gpy_mbox_read(struct phy_device *phydev, u32 addr)
>  
>  static int gpy_config_init(struct phy_device *phydev)
>  {
> +	struct gpy_priv *priv = phydev->priv;
>  	int ret;
>  
> +	/* Disalbe SGMII Autoneg if we want to match SGMII to TPI speed */

nit: Disable