[PATCH net-next v3] net: phy: aquantia: Add support for 5GbaseR

[Hongmei Xu]

Aquantia PHYs can operate with a 5G USX interface between the PHY
and MAC, reported as interface type 12 in the PHYXS vendor interface
status register (MDIO_PHYXS_VEND_IF_STATUS_TYPE_USX_5G).

Without this change, aqr_gen1_read_status() falls through to the
default case and sets phydev->link = false when the interface type
is USX 5G, preventing 5G links from coming up.

Add the missing PHY_INTERFACE_MODE_5GBASER handling in three places:

- aqr_gen1_read_status(): map USX 5G interface type to
  PHY_INTERFACE_MODE_5GBASER so the link is correctly reported
- aqr_gen1_config_init(): accept PHY_INTERFACE_MODE_5GBASER as a
  valid interface mode, otherwise the PHY is rejected with -ENODEV
- aqr_gen2_get_rate_matching(): return RATE_MATCH_PAUSE for
  PHY_INTERFACE_MODE_5GBASER, consistent with 10GBASER and 2500BASEX,
  since the MAC-side interface runs at a fixed rate and the PHY handles
  rate adaptation via pause frames

Co-developed-by: Sagar Cheluvegowda <sagar.cheluvegowda@xxxxxxxxxxxxxxxx>
Signed-off-by: Sagar Cheluvegowda <sagar.cheluvegowda@xxxxxxxxxxxxxxxx>
Signed-off-by: Hongmei Xu <hongmei.xu@xxxxxxxxxxxxxxxx>
---
Changes in v3:
- Add git tree name net-next to the subject line. [PATCH net-next]
- Add Co-developer
- Link to v2: https://patch.msgid.link/20260923-aquantia-support-5gbaser-v2-1-4d789dc21418@xxxxxxxxxxxxxxxx

Changes in v2:
- Fix the local variable assignment error in API: aqr_gen1_read_status,
  should use interface rather than phydev->interface,
  interface = PHY_INTERFACE_MODE_5GBASER.
- Link to v1: https://patch.msgid.link/20260923-aquantia-support-5gbaser-v1-1-537d39bb8c35@xxxxxxxxxxxxxxxx
---
 drivers/net/phy/aquantia/aquantia_main.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/aquantia/aquantia_main.c b/drivers/net/phy/aquantia/aquantia_main.c
index e95d391a6dc2..1e3df47365e4 100644
--- a/drivers/net/phy/aquantia/aquantia_main.c
+++ b/drivers/net/phy/aquantia/aquantia_main.c
@@ -49,6 +49,7 @@
 #define MDIO_PHYXS_VEND_IF_STATUS_TYPE_RXAUI	7
 #define MDIO_PHYXS_VEND_IF_STATUS_TYPE_OFF	9
 #define MDIO_PHYXS_VEND_IF_STATUS_TYPE_OCSGMII	10
+#define MDIO_PHYXS_VEND_IF_STATUS_TYPE_USX_5G	12
 
 #define MDIO_AN_VEND_PROV			0xc400
 #define MDIO_AN_VEND_PROV_1000BASET_FULL	BIT(15)
@@ -585,6 +586,9 @@ static int aqr_gen1_read_status(struct phy_device *phydev)
 	case MDIO_PHYXS_VEND_IF_STATUS_TYPE_OCSGMII:
 		interface = PHY_INTERFACE_MODE_2500BASEX;
 		break;
+	case MDIO_PHYXS_VEND_IF_STATUS_TYPE_USX_5G:
+		interface = PHY_INTERFACE_MODE_5GBASER;
+		break;
 	case MDIO_PHYXS_VEND_IF_STATUS_TYPE_OFF:
 	default:
 		phydev->link = false;
@@ -786,7 +790,8 @@ static int aqr_gen1_config_init(struct phy_device *phydev)
 	    phydev->interface != PHY_INTERFACE_MODE_10GKR &&
 	    phydev->interface != PHY_INTERFACE_MODE_10GBASER &&
 	    phydev->interface != PHY_INTERFACE_MODE_XAUI &&
-	    phydev->interface != PHY_INTERFACE_MODE_RXAUI)
+	    phydev->interface != PHY_INTERFACE_MODE_RXAUI &&
+	    phydev->interface != PHY_INTERFACE_MODE_5GBASER)
 		return -ENODEV;
 
 	WARN(phydev->interface == PHY_INTERFACE_MODE_XGMII,
@@ -1040,7 +1045,8 @@ static int aqr_gen2_get_rate_matching(struct phy_device *phydev,
 				      phy_interface_t iface)
 {
 	if (iface == PHY_INTERFACE_MODE_10GBASER ||
-	    iface == PHY_INTERFACE_MODE_2500BASEX)
+	    iface == PHY_INTERFACE_MODE_2500BASEX ||
+	    iface == PHY_INTERFACE_MODE_5GBASER)
 		return RATE_MATCH_PAUSE;
 	return RATE_MATCH_NONE;
 }

---
base-commit: 944ae66642b726bd6b25ae71b1e9ff88a0e0bdb0
change-id: 20260923-aquantia-support-5gbaser-e7271bde9f89

Best regards,
--  
Hongmei Xu <hongmei.xu@xxxxxxxxxxxxxxxx>