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X-OriginatorOrg: axis.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Jul 2025 08:35:34.2307 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f28308f8-4dce-44be-5fec-08ddbad5be79 X-MS-Exchange-CrossTenant-Id: 78703d3c-b907-432f-b066-88f7af9ca3af X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=78703d3c-b907-432f-b066-88f7af9ca3af;Ip=[195.60.68.100];Helo=[mail.axis.com] X-MS-Exchange-CrossTenant-AuthSource: DU2PEPF00028D03.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PAVPR02MB9987 Some Broadcom PHYs are capable to operate in simplified MII mode, without TXER, RXER, CRS and COL signals as defined for the MII. The MII-Lite mode can be used on most Ethernet controllers with full MII interface by just leaving the input signals (RXER, CRS, COL) inactive. The absence of COL signal makes half-duplex link modes impossible but does not interfere with BroadR-Reach link modes on Broadcom PHYs, because they are all full-duplex only. Add MII-Lite interface mode, especially for Broadcom two-wire PHYs. Signed-off-by: Kamil Hor=C3=A1k - 2N Reviewed-by: Maxime Chevallier Reviewed-by: Florian Fainelli --- Documentation/networking/phy.rst | 7 +++++++ drivers/net/phy/phy-core.c | 1 + drivers/net/phy/phy_caps.c | 4 ++++ drivers/net/phy/phylink.c | 1 + include/linux/phy.h | 4 ++++ 5 files changed, 17 insertions(+) diff --git a/Documentation/networking/phy.rst b/Documentation/networking/ph= y.rst index f64641417c54..7f159043ad5a 100644 --- a/Documentation/networking/phy.rst +++ b/Documentation/networking/phy.rst @@ -333,6 +333,13 @@ Some of the interface modes are described below: SerDes lane, each port having speeds of 2.5G / 1G / 100M / 10M achieved through symbol replication. The PCS expects the standard USXGMII code = word. =20 +``PHY_INTERFACE_MODE_MIILITE`` + Non-standard, simplified MII mode, without TXER, RXER, CRS and COL sig= nals + as defined for the MII. The absence of COL signal makes half-duplex li= nk + modes impossible but does not interfere with BroadR-Reach link modes on + Broadcom (and other two-wire Ethernet) PHYs, because they are full-dup= lex + only. + Pause frames / flow control =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D =20 diff --git a/drivers/net/phy/phy-core.c b/drivers/net/phy/phy-core.c index e177037f9110..b2df06343b7e 100644 --- a/drivers/net/phy/phy-core.c +++ b/drivers/net/phy/phy-core.c @@ -115,6 +115,7 @@ int phy_interface_num_ports(phy_interface_t interface) return 0; case PHY_INTERFACE_MODE_INTERNAL: case PHY_INTERFACE_MODE_MII: + case PHY_INTERFACE_MODE_MIILITE: case PHY_INTERFACE_MODE_GMII: case PHY_INTERFACE_MODE_TBI: case PHY_INTERFACE_MODE_REVMII: diff --git a/drivers/net/phy/phy_caps.c b/drivers/net/phy/phy_caps.c index 38417e288611..b4a4dea3e756 100644 --- a/drivers/net/phy/phy_caps.c +++ b/drivers/net/phy/phy_caps.c @@ -316,6 +316,10 @@ unsigned long phy_caps_from_interface(phy_interface_t = interface) link_caps |=3D BIT(LINK_CAPA_100HD) | BIT(LINK_CAPA_100FD); break; =20 + case PHY_INTERFACE_MODE_MIILITE: + link_caps |=3D BIT(LINK_CAPA_10FD) | BIT(LINK_CAPA_100FD); + break; + case PHY_INTERFACE_MODE_TBI: case PHY_INTERFACE_MODE_MOCA: case PHY_INTERFACE_MODE_RTBI: diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c index 0faa3d97e06b..766cad40f1b8 100644 --- a/drivers/net/phy/phylink.c +++ b/drivers/net/phy/phylink.c @@ -234,6 +234,7 @@ static int phylink_interface_max_speed(phy_interface_t = interface) case PHY_INTERFACE_MODE_SMII: case PHY_INTERFACE_MODE_REVMII: case PHY_INTERFACE_MODE_MII: + case PHY_INTERFACE_MODE_MIILITE: return SPEED_100; =20 case PHY_INTERFACE_MODE_TBI: diff --git a/include/linux/phy.h b/include/linux/phy.h index e194dad1623d..6aad4b741c01 100644 --- a/include/linux/phy.h +++ b/include/linux/phy.h @@ -103,6 +103,7 @@ extern const int phy_basic_ports_array[3]; * @PHY_INTERFACE_MODE_QUSGMII: Quad Universal SGMII * @PHY_INTERFACE_MODE_1000BASEKX: 1000Base-KX - with Clause 73 AN * @PHY_INTERFACE_MODE_10G_QXGMII: 10G-QXGMII - 4 ports over 10G USXGMII + * @PHY_INTERFACE_MODE_MIILITE: MII-Lite - MII without RXER TXER CRS COL * @PHY_INTERFACE_MODE_MAX: Book keeping * * Describes the interface between the MAC and PHY. @@ -144,6 +145,7 @@ typedef enum { PHY_INTERFACE_MODE_QUSGMII, PHY_INTERFACE_MODE_1000BASEKX, PHY_INTERFACE_MODE_10G_QXGMII, + PHY_INTERFACE_MODE_MIILITE, PHY_INTERFACE_MODE_MAX, } phy_interface_t; 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X-OriginatorOrg: axis.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Jul 2025 08:35:34.6366 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b91ec9a6-9f91-4648-7927-08ddbad5beb6 X-MS-Exchange-CrossTenant-Id: 78703d3c-b907-432f-b066-88f7af9ca3af X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=78703d3c-b907-432f-b066-88f7af9ca3af;Ip=[195.60.68.100];Helo=[mail.axis.com] X-MS-Exchange-CrossTenant-AuthSource: DU2PEPF00028D03.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DBBPR02MB10914 Some Broadcom PHYs are capable to operate in simplified MII mode, without TXER, RXER, CRS and COL signals as defined for the MII. The MII-Lite mode can be used on most Ethernet controllers with full MII interface by just leaving the input signals (RXER, CRS, COL) inactive. The absence of COL signal makes half-duplex link modes impossible but does not interfere with BroadR-Reach link modes on Broadcom PHYs, because they are all full-duplex only. Add new interface type "mii-lite" to phy-connection-type enum. Signed-off-by: Kamil Hor=C3=A1k - 2N Reviewed-by: Maxime Chevallier Reviewed-by: Florian Fainelli --- Documentation/devicetree/bindings/net/ethernet-controller.yaml | 1 + 1 file changed, 1 insertion(+) diff --git a/Documentation/devicetree/bindings/net/ethernet-controller.yaml= b/Documentation/devicetree/bindings/net/ethernet-controller.yaml index 7cbf11bbe99c..66b1cfbbfe22 100644 --- a/Documentation/devicetree/bindings/net/ethernet-controller.yaml +++ b/Documentation/devicetree/bindings/net/ethernet-controller.yaml @@ -39,6 +39,7 @@ properties: # MAC. - internal - mii + - mii-lite - gmii - sgmii - psgmii --=20 2.39.5 From nobody Tue Oct 7 23:01:43 2025 Received: from DB3PR0202CU003.outbound.protection.outlook.com (mail-northeuropeazon11010062.outbound.protection.outlook.com [52.101.84.62]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8351028A706; Fri, 4 Jul 2025 08:35:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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X-OriginatorOrg: axis.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Jul 2025 08:35:34.9962 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 174ccb1d-2818-4072-4dfc-08ddbad5beed X-MS-Exchange-CrossTenant-Id: 78703d3c-b907-432f-b066-88f7af9ca3af X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=78703d3c-b907-432f-b066-88f7af9ca3af;Ip=[195.60.68.100];Helo=[mail.axis.com] X-MS-Exchange-CrossTenant-AuthSource: DU2PEPF00028D03.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM7PR02MB6321 Broadcom PHYs featuring the BroadR-Reach two-wire link mode are usually capable to operate in simplified MII mode, without TXER, RXER, CRS and COL signals as defined for the MII. The absence of COL signal makes half-duplex link modes impossible, however, the BroadR-Reach modes are all full-duplex only. Depending on the IC encapsulation, there exist MII-Lite-only PHYs such as bcm54811 in MLP. The PHY itself is hardware-strapped to select among multiple RGMII and MII-Lite modes, but the MII-Lite mode must be also activated by software. Add MII-Lite activation for bcm5481x PHYs. Fixes: 03ab6c244bb0 ("net: phy: bcm-phy-lib: Implement BroadR-Reach link mo= des") Signed-off-by: Kamil Hor=C3=A1k - 2N Reviewed-by: Florian Fainelli --- drivers/net/phy/broadcom.c | 14 +++++++++++++- include/linux/brcmphy.h | 6 ++++++ 2 files changed, 19 insertions(+), 1 deletion(-) diff --git a/drivers/net/phy/broadcom.c b/drivers/net/phy/broadcom.c index 9b1de54fd483..8547983bd72f 100644 --- a/drivers/net/phy/broadcom.c +++ b/drivers/net/phy/broadcom.c @@ -407,7 +407,7 @@ static int bcm5481x_set_brrmode(struct phy_device *phyd= ev, bool on) static int bcm54811_config_init(struct phy_device *phydev) { struct bcm54xx_phy_priv *priv =3D phydev->priv; - int err, reg; + int err, reg, exp_sync_ethernet; =20 /* Enable CLK125 MUX on LED4 if ref clock is enabled. */ if (!(phydev->dev_flags & PHY_BRCM_RX_REFCLK_UNUSED)) { @@ -424,6 +424,18 @@ static int bcm54811_config_init(struct phy_device *phy= dev) if (priv->brr_mode) phydev->autoneg =3D 0; =20 + /* Enable MII Lite (No TXER, RXER, CRS, COL) if configured */ + if (phydev->interface =3D=3D PHY_INTERFACE_MODE_MIILITE) + exp_sync_ethernet =3D BCM_EXP_SYNC_ETHERNET_MII_LITE; 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X-OriginatorOrg: axis.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Jul 2025 08:35:35.4649 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e942d31c-7353-449c-b76e-08ddbad5bf34 X-MS-Exchange-CrossTenant-Id: 78703d3c-b907-432f-b066-88f7af9ca3af X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=78703d3c-b907-432f-b066-88f7af9ca3af;Ip=[195.60.68.100];Helo=[mail.axis.com] X-MS-Exchange-CrossTenant-AuthSource: DU2PEPF00028D03.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR02MB9706 Reset the bit 12 in PHY's LRE Control register upon initialization. According to the datasheet, this bit must be written to zero after every device reset. Fixes: 03ab6c244bb0 ("net: phy: bcm-phy-lib: Implement BroadR-Reach link mo= des") Signed-off-by: Kamil Hor=C3=A1k - 2N Reviewed-by: Florian Fainelli --- drivers/net/phy/broadcom.c | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-) diff --git a/drivers/net/phy/broadcom.c b/drivers/net/phy/broadcom.c index 8547983bd72f..a60e58ef90c4 100644 --- a/drivers/net/phy/broadcom.c +++ b/drivers/net/phy/broadcom.c @@ -667,7 +667,7 @@ static int bcm5481x_read_abilities(struct phy_device *p= hydev) { struct device_node *np =3D phydev->mdio.dev.of_node; struct bcm54xx_phy_priv *priv =3D phydev->priv; - int i, val, err; + int i, val, err, aneg; =20 for (i =3D 0; i < ARRAY_SIZE(bcm54811_linkmodes); i++) linkmode_clear_bit(bcm54811_linkmodes[i], phydev->supported); @@ -688,9 +688,19 @@ static int bcm5481x_read_abilities(struct phy_device *= phydev) if (val < 0) return val; =20 + /* BCM54811 is not capable of LDS but the corresponding bit + * in LRESR is set to 1 and marked "Ignore" in the datasheet. + * So we must read the bcm54811 as unable to auto-negotiate + * in BroadR-Reach mode. + */ + if (BRCM_PHY_MODEL(phydev) =3D=3D PHY_ID_BCM54811) + aneg =3D 0; + else + aneg =3D val & LRESR_LDSABILITY; + linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->supported, - val & LRESR_LDSABILITY); + aneg); linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT1_Full_BIT, phydev->supported, val & LRESR_100_1PAIR); @@ -747,8 +757,15 @@ static int bcm54811_config_aneg(struct phy_device *phy= dev) =20 /* Aneg firstly. */ if (priv->brr_mode) { - /* BCM54811 is only capable of autonegotiation in IEEE mode */ - phydev->autoneg =3D 0; + /* BCM54811 is only capable of autonegotiation in IEEE mode. + * In BroadR-Reach mode, disable the Long Distance Signaling, + * the BRR mode autoneg as supported in other Broadcom PHYs. + * This bit is marked as "Reserved" and "Default 1, must be + * written to 0 after every device reset" in the datasheet. + */ + ret =3D phy_modify(phydev, MII_BCM54XX_LRECR, LRECR_LDSEN, 0); + if (ret < 0) + return ret; ret =3D bcm_config_lre_aneg(phydev, false); } else { ret =3D genphy_config_aneg(phydev); --=20 2.39.5