linux-kernel - [PATCH net-next 2/4] net: phy: motorcomm: Support YT8531S PHY in YT6801 Ethernet controller

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Message-ID: <20251014164746.50696-4-ziyao@disroot.org>
Date: Tue, 14 Oct 2025 16:47:45 +0000
From: Yao Zi <ziyao@...root.org>
To: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Yao Zi <ziyao@...root.org>,
	Frank <Frank.Sae@...or-comm.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Choong Yong Liang <yong.liang.choong@...ux.intel.com>,
	Chen-Yu Tsai <wens@...e.org>,
	Jisheng Zhang <jszhang@...nel.org>,
	Furong Xu <0x1207@...il.com>
Cc: linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: [PATCH net-next 2/4] net: phy: motorcomm: Support YT8531S PHY in YT6801 Ethernet controller

YT6801's internal PHY is confirmed as a GMII-capable variant of YT8531S
by a previous series[1] and reading PHY ID. Add support for
PHY_INTERFACE_MODE_INTERNAL for YT8531S to allow the Ethernet driver to
reuse the PHY code for its internal PHY.

Link: https://lore.kernel.org/all/a48d76ac-db08-46d5-9528-f046a7b541dc@motor-comm.com/ # [1]
Co-developed-by: Frank Sae <Frank.Sae@...or-comm.com>
Signed-off-by: Frank Sae <Frank.Sae@...or-comm.com>
Signed-off-by: Yao Zi <ziyao@...root.org>
---
 drivers/net/phy/motorcomm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/phy/motorcomm.c b/drivers/net/phy/motorcomm.c
index a3593e663059..e478e4f51755 100644
--- a/drivers/net/phy/motorcomm.c
+++ b/drivers/net/phy/motorcomm.c
@@ -910,6 +910,10 @@ static int ytphy_rgmii_clk_delay_config(struct phy_device *phydev)
 		val |= FIELD_PREP(YT8521_RC1R_RX_DELAY_MASK, rx_reg) |
 		       FIELD_PREP(YT8521_RC1R_GE_TX_DELAY_MASK, tx_reg);
 		break;
+	case PHY_INTERFACE_MODE_INTERNAL:
+		if (phydev->drv->phy_id != PHY_ID_YT8531S)
+			return -EOPNOTSUPP;
+		break;
 	default: /* do not support other modes */
 		return -EOPNOTSUPP;
 	}
-- 
2.50.1