linux-kernel - [PATCH 1/2] phy: microchip: lan966x: Add support for inverting the rx/tx lanes

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Message-ID: <20251110110536.2596490-2-horatiu.vultur@microchip.com>
Date: Mon, 10 Nov 2025 12:05:35 +0100
From: Horatiu Vultur <horatiu.vultur@...rochip.com>
To: <vkoul@...nel.org>, <kishon@...nel.org>, <robh@...nel.org>,
	<krzk+dt@...nel.org>, <conor+dt@...nel.org>
CC: <linux-phy@...ts.infradead.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Horatiu Vultur <horatiu.vultur@...rochip.com>
Subject: [PATCH 1/2] phy: microchip: lan966x: Add support for inverting the rx/tx lanes

The lan966x has 3 SerDes and they have the capability to invert the P
and N signal for the TX and RX. Add this configuration option, which is
done through device tree ans the board designer will decide if the
serdes signals to be inverted.

Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
---
 drivers/phy/microchip/lan966x_serdes.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/phy/microchip/lan966x_serdes.c b/drivers/phy/microchip/lan966x_serdes.c
index 835e369cdfc5f..5faf2001a100b 100644
--- a/drivers/phy/microchip/lan966x_serdes.c
+++ b/drivers/phy/microchip/lan966x_serdes.c
@@ -17,6 +17,11 @@
 #define PLL_CONF_SERDES_125MHZ	2
 #define PLL_CONF_BYPASS		3
 
+#define LAN966X_SERDES_MAX	3
+#define LAN966X_SERDES_DIR	2
+#define LAN966X_SERDES_TX	0
+#define LAN966X_SERDES_RX	1
+
 #define lan_offset_(id, tinst, tcnt,			\
 		   gbase, ginst, gcnt, gwidth,		\
 		   raddr, rinst, rcnt, rwidth)		\
@@ -129,6 +134,7 @@ struct serdes_ctrl {
 	struct device		*dev;
 	struct phy		*phys[SERDES_MAX];
 	int			ref125;
+	bool			inverted[LAN966X_SERDES_MAX][LAN966X_SERDES_DIR];
 };
 
 struct serdes_macro {
@@ -387,6 +393,11 @@ static int lan966x_sd6g40_setup(struct serdes_macro *macro, u32 idx, int mode)
 
 	conf.refclk125M = macro->ctrl->ref125;
 
+	if (macro->ctrl->inverted[idx][LAN966X_SERDES_TX])
+		conf.txinvert = 1;
+	if (macro->ctrl->inverted[idx][LAN966X_SERDES_RX])
+		conf.rxinvert = 1;
+
 	if (mode == PHY_INTERFACE_MODE_QSGMII)
 		conf.mode = LAN966X_SD6G40_MODE_QSGMII;
 	else
@@ -596,6 +607,18 @@ static int serdes_probe(struct platform_device *pdev)
 	ctrl->ref125 = (val == PLL_CONF_125MHZ ||
 			val == PLL_CONF_SERDES_125MHZ);
 
+	for (i = 0; i < LAN966X_SERDES_MAX; ++i) {
+		u8 prop[25];
+
+		sprintf(prop, "microchip,s%d-tx-inverted", i);
+		if (device_property_read_bool(ctrl->dev, prop))
+			ctrl->inverted[i][LAN966X_SERDES_TX] = true;
+
+		sprintf(prop, "microchip,s%d-rx-inverted", i);
+		if (device_property_read_bool(ctrl->dev, prop))
+			ctrl->inverted[i][LAN966X_SERDES_RX] = true;
+	}
+
 	dev_set_drvdata(&pdev->dev, ctrl);
 
 	provider = devm_of_phy_provider_register(ctrl->dev,
-- 
2.34.1