linux-kernel - Re: [PATCH net] net: phylink: allow RGMII/RTBI in-band status

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Date:   Tue, 23 Aug 2022 15:26:25 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Qingfang DENG <dqfext@...il.com>
Cc:     Russell King <linux@...linux.org.uk>, Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: phylink: allow RGMII/RTBI in-band status

On Fri, 19 Aug 2022 17:26:06 +0800 Qingfang DENG wrote:
> As per RGMII specification v2.0, section 3.4.1, RGMII/RTBI has an
> optional in-band status feature where the PHY's link status, speed and
> duplex mode can be passed to the MAC.
> Allow RGMII/RTBI to use in-band status.
> 
> Fixes: 9525ae83959b ("phylink: add phylink infrastructure")
> Signed-off-by: Qingfang DENG <dqfext@...il.com>

Russell, PHY folks, any judgment on this one?

Qingfang is there a platform which require RGMII to be supported 
in upstream LTS branches? If there isn't you should re-target 
the patch at net-next and drop the Fixes tag. Not implementing
the entire spec is not considered a bug. Please clarify this
in the commit message.

> diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
> index 9bd69328dc4d..57186d322835 100644
> --- a/drivers/net/phy/phylink.c
> +++ b/drivers/net/phy/phylink.c
> @@ -632,6 +632,11 @@ static int phylink_parse_mode(struct phylink *pl, struct fwnode_handle *fwnode)
>  		switch (pl->link_config.interface) {
>  		case PHY_INTERFACE_MODE_SGMII:
>  		case PHY_INTERFACE_MODE_QSGMII:
> +		case PHY_INTERFACE_MODE_RGMII:
> +		case PHY_INTERFACE_MODE_RGMII_ID:
> +		case PHY_INTERFACE_MODE_RGMII_RXID:
> +		case PHY_INTERFACE_MODE_RGMII_TXID:
> +		case PHY_INTERFACE_MODE_RTBI:
>  			phylink_set(pl->supported, 10baseT_Half);
>  			phylink_set(pl->supported, 10baseT_Full);
>  			phylink_set(pl->supported, 100baseT_Half);