linux-kernel - Re: [PATCH 2/2] dt-bindings: net: adi,adin: document LP termination property

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Message-ID: <933810763.1512847.1765900200898.JavaMail.zimbra@savoirfairelinux.com>
Date: Tue, 16 Dec 2025 10:50:00 -0500 (EST)
From: Osose Itua <osose.itua@...oirfairelinux.com>
To: netdev <netdev@...r.kernel.org>
Cc: devicetree <devicetree@...r.kernel.org>, 
	linux-kernel <linux-kernel@...r.kernel.org>, 
	Michael Hennerich <michael.hennerich@...log.com>, 
	Jérome Oufella <jerome.oufella@...oirfairelinux.com>
Subject: Re: [PATCH 2/2] dt-bindings: net: adi,adin: document LP termination
  property

>From 4b4409504fd41c81c7150ae1d88bc0ca755e6ace Mon Sep 17 00:00:00 2001
From: Osose Itua <osose.itua@...oirfairelinux.com>
Date: Mon, 15 Dec 2025 17:59:38 -0500
Subject: [PATCH 2/2] dt-bindings: net: adi,adin: document LP termination
 property

Add "adi,low-cmode-impedance" boolean property which, when present,
configures the PHY for the lowest common-mode impedance on the receive
pair for 100BASE-TX operation.

Signed-off-by: Osose Itua <osose.itua@...oirfairelinux.com>
---
 Documentation/devicetree/bindings/net/adi,adin.yaml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/adi,adin.yaml b/Documentation/devicetree/bindings/net/adi,adin.yaml
index c425a9f1886d..d3c8c5cc4bb1 100644
--- a/Documentation/devicetree/bindings/net/adi,adin.yaml
+++ b/Documentation/devicetree/bindings/net/adi,adin.yaml
@@ -52,6 +52,12 @@ properties:
     description: Enable 25MHz reference clock output on CLK25_REF pin.
     type: boolean
 
+  adi,low-cmode-impedance:
+    description: |
+      Ability to configure for the lowest common-mode impedance on the
+      receive pair for 100BASE-TX.
+    type: boolean
+
 unevaluatedProperties: false
 
 examples:


----- Message original -----
De: "Osose Itua" <osose.itua@...oirfairelinux.com>
À: "netdev" <netdev@...r.kernel.org>
Cc: "devicetree" <devicetree@...r.kernel.org>, "linux-kernel" <linux-kernel@...r.kernel.org>, "Michael Hennerich" <michael.hennerich@...log.com>, "Jérome Oufella" <jerome.oufella@...oirfairelinux.com>
Envoyé: Mardi 16 Décembre 2025 10:48:39
Objet: [PATCH 1/2] net: phy: adin: enable configuration of the LP  Termination Register

>From 9c68d9082a9c0550891f24c5902c1f0de15de949 Mon Sep 17 00:00:00 2001
From: Osose Itua <osose.itua@...oirfairelinux.com>
Date: Fri, 14 Nov 2025 17:00:14 -0500
Subject: [PATCH 1/2] net: phy: adin: enable configuration of the LP
 Termination Register

The ADIN1200/ADIN1300 provide a control bit that selects between normal
receive termination and the lowest common mode impedance for 100BASE-TX
operation. This behavior is controlled through the Low Power Termination
register (B_100_ZPTM_EN_DIMRX).

Bit 0 of this register enables normal termination when set (this is the
default), and selects the lowest common mode impedance when cleared.

Signed-off-by: Osose Itua <osose.itua@...oirfairelinux.com>
---
 drivers/net/phy/adin.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
index 7fa713ca8d45..2969480a7be3 100644
--- a/drivers/net/phy/adin.c
+++ b/drivers/net/phy/adin.c
@@ -89,6 +89,9 @@
 #define ADIN1300_CLOCK_STOP_REG			0x9400
 #define ADIN1300_LPI_WAKE_ERR_CNT_REG		0xa000
 
+#define ADIN1300_B_100_ZPTM_DIMRX		0xB685
+#define ADIN1300_B_100_ZPTM_EN_DIMRX		BIT(0)
+
 #define ADIN1300_CDIAG_RUN			0xba1b
 #define   ADIN1300_CDIAG_RUN_EN			BIT(0)
 
@@ -522,6 +525,31 @@ static int adin_config_clk_out(struct phy_device *phydev)
 			      ADIN1300_GE_CLK_CFG_MASK, sel);
 }
 
+static int adin_config_zptm100(struct phy_device *phydev)
+{
+	struct device *dev = &phydev->mdio.dev;
+	u8 reg;
+	int rc;
+
+	if (!(device_property_read_bool(dev, "adi,low-cmode-impedance")))
+		return 0;
+
+	/* set to 0 to configure for lowest common-mode impedance */
+	rc = phy_write_mmd(phydev, MDIO_MMD_VEND1, ADIN1300_B_100_ZPTM_DIMRX, 0x0);
+	if (rc < 0)
+		return rc;
+
+	reg = phy_read_mmd(phydev, MDIO_MMD_VEND1, ADIN1300_B_100_ZPTM_DIMRX);
+	if (reg < 0)
+		return reg;
+
+	if (reg != 0x0)
+		phydev_err(phydev,
+			   "Lowest common-mode impedance configuration failed\n");
+
+	return 0;
+}
+
 static int adin_config_init(struct phy_device *phydev)
 {
 	int rc;
@@ -548,6 +576,10 @@ static int adin_config_init(struct phy_device *phydev)
 	if (rc < 0)
 		return rc;
 
+	rc = adin_config_zptm100(phydev);
+	if (rc < 0)
+		return rc;
+
 	phydev_dbg(phydev, "PHY is using mode '%s'\n",
 		   phy_modes(phydev->interface));