netdev - Re: [RFC PATCH v2 net-next 01/14] net: dsa: mt7530: fix comments regarding port 5 and 6 for both switches

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Date:   Mon, 10 Apr 2023 15:30:50 +0100
From:   Daniel Golle <daniel@...rotopia.org>
To:     arinc9.unal@...il.com
Cc:     Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Russell King <linux@...linux.org.uk>,
        Arınç ÜNAL <arinc.unal@...nc9.com>,
        Richard van Schagen <richard@...terhints.com>,
        Richard van Schagen <vschagen@...com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        erkin.bozoglu@...ont.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [RFC PATCH v2 net-next 01/14] net: dsa: mt7530: fix comments
 regarding port 5 and 6 for both switches

On Fri, Apr 07, 2023 at 04:46:13PM +0300, arinc9.unal@...il.com wrote:
> From: Arınç ÜNAL <arinc.unal@...nc9.com>
> 
> There's no logic to numerically order the CPU ports. State the port number
> and its being a CPU port instead.

Port 5 is often used as a user port as well, eg. on the BPi-R3 where
it serves to provide SerDes for the 2nd SFP cage.
On other boards (e.g. Netgear WAX-206) it is used to connect a 2.5G
PHY used as WAN port.

Hence just stating that port 5 "a CPU port" could be a bit misleading
as it is not always used as a CPU port.

> 
> Remove the irrelevant PHY muxing information from
> mt7530_mac_port_get_caps(). Explain the supported MII modes instead.
> 
> Remove the out of place PHY muxing information from
> mt753x_phylink_mac_config(). The function is for both the MT7530 and MT7531
> switches but there's no phy muxing on MT7531.
> 
> These comments were gradually introduced with the commits below.
> ca366d6c889b ("net: dsa: mt7530: Convert to PHYLINK API")
> 38f790a80560 ("net: dsa: mt7530: Add support for port 5")
> 88bdef8be9f6 ("net: dsa: mt7530: Extend device data ready for adding a new
> hardware")
> c288575f7810 ("net: dsa: mt7530: Add the support of MT7531 switch")
> 
> Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
> ---
>  drivers/net/dsa/mt7530.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
> index e4bb5037d352..31ef70f0cd12 100644
> --- a/drivers/net/dsa/mt7530.c
> +++ b/drivers/net/dsa/mt7530.c
> @@ -2506,7 +2506,7 @@ static void mt7530_mac_port_get_caps(struct dsa_switch *ds, int port,
>  			  config->supported_interfaces);
>  		break;
>  
> -	case 5: /* 2nd cpu port with phy of port 0 or 4 / external phy */
> +	case 5: /* Port 5, a CPU port, supports rgmii, mii, and gmii. */
>  		phy_interface_set_rgmii(config->supported_interfaces);
>  		__set_bit(PHY_INTERFACE_MODE_MII,
>  			  config->supported_interfaces);
> @@ -2514,7 +2514,7 @@ static void mt7530_mac_port_get_caps(struct dsa_switch *ds, int port,
>  			  config->supported_interfaces);
>  		break;
>  
> -	case 6: /* 1st cpu port */
> +	case 6: /* Port 6, a CPU port, supports rgmii and trgmii. */
>  		__set_bit(PHY_INTERFACE_MODE_RGMII,
>  			  config->supported_interfaces);
>  		__set_bit(PHY_INTERFACE_MODE_TRGMII,
> @@ -2539,14 +2539,14 @@ static void mt7531_mac_port_get_caps(struct dsa_switch *ds, int port,
>  			  config->supported_interfaces);
>  		break;
>  
> -	case 5: /* 2nd cpu port supports either rgmii or sgmii/8023z */
> +	case 5: /* Port 5, a CPU port, supports rgmii and sgmii/802.3z. */
>  		if (mt7531_is_rgmii_port(priv, port)) {
>  			phy_interface_set_rgmii(config->supported_interfaces);
>  			break;
>  		}
>  		fallthrough;
>  
> -	case 6: /* 1st cpu port supports sgmii/8023z only */
> +	case 6: /* Port 6, a CPU port, supports sgmii/802.3z only. */
>  		__set_bit(PHY_INTERFACE_MODE_SGMII,
>  			  config->supported_interfaces);
>  		__set_bit(PHY_INTERFACE_MODE_1000BASEX,
> @@ -2738,7 +2738,7 @@ mt753x_phylink_mac_config(struct dsa_switch *ds, int port, unsigned int mode,
>  		    state->interface != PHY_INTERFACE_MODE_INTERNAL)
>  			goto unsupported;
>  		break;
> -	case 5: /* 2nd cpu port with phy of port 0 or 4 / external phy */
> +	case 5: /* Port 5, a CPU port. */
>  		if (priv->p5_interface == state->interface)
>  			break;
>  
> @@ -2748,7 +2748,7 @@ mt753x_phylink_mac_config(struct dsa_switch *ds, int port, unsigned int mode,
>  		if (priv->p5_intf_sel != P5_DISABLED)
>  			priv->p5_interface = state->interface;
>  		break;
> -	case 6: /* 1st cpu port */
> +	case 6: /* Port 6, a CPU port. */
>  		if (priv->p6_interface == state->interface)
>  			break;
>  
> -- 
> 2.37.2
>