[RFC PATCH net-next 04/22] net: dsa: mt7530: improve comments regarding port 5 and 6

[arinc9.unal@gmail.com]

From: Arınç ÜNAL <arinc.unal@arinc9.com>

There's no logic to numerically order the CPU ports. State the port number
and its capability of being used as a CPU port instead.

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@arinc9.com>
---
 drivers/net/dsa/mt7530.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index edc34be745b2..e956ffa1eea8 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -2504,7 +2504,9 @@ 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 which can be used as a CPU port supports rgmii with
+		 * delays, mii, and gmii.
+		 */
 		phy_interface_set_rgmii(config->supported_interfaces);
 		__set_bit(PHY_INTERFACE_MODE_MII,
 			  config->supported_interfaces);
@@ -2512,7 +2514,9 @@ 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 which can be used as a CPU port supports rgmii and
+		 * trgmii.
+		 */
 		__set_bit(PHY_INTERFACE_MODE_RGMII,
 			  config->supported_interfaces);
 		__set_bit(PHY_INTERFACE_MODE_TRGMII,
@@ -2532,14 +2536,17 @@ 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 which can be used as a CPU port supports rgmii with
+		 * delays on MT7531BE, sgmii/802.3z on MT7531AE.
+		 */
 		if (!priv->p5_sgmii) {
 			phy_interface_set_rgmii(config->supported_interfaces);
 			break;
 		}
 		fallthrough;
 
-	case 6: /* 1st cpu port supports sgmii/8023z only */
+	case 6: /* Port 6 which can be used as a CPU port supports sgmii/802.3z.
+		 */
 		__set_bit(PHY_INTERFACE_MODE_SGMII,
 			  config->supported_interfaces);
 		__set_bit(PHY_INTERFACE_MODE_1000BASEX,
@@ -2731,7 +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, can be used as a CPU port. */
 		if (priv->p5_interface == state->interface)
 			break;
 
@@ -2741,7 +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, can be used as a CPU port. */
 		if (priv->p6_interface == state->interface)
 			break;
 
-- 
2.37.2