[PATCH net-next 0/5] net: ethernet: adi: adin1110: Add OPEN Alliance TC6 support

[PATCH net-next 0/5] net: ethernet: adi: adin1110: Add OPEN Alliance TC6 support

[Iustin Stolniceanu]

The ADIN1110 supports two SPI host interface protocols: the generic SPI
protocol, which the adin1110 driver implements today, and the OPEN
Alliance TC6 protocol. The protocol is selected by the SPI_CFG1 pin,
which the device latches when it comes out of reset.

This series adds OPEN Alliance TC6 support for the ADIN1110 using the
oa_tc6 framework, selected by a new adi,spi-oa-tc6 DT property:

 1-2: oa_tc6: configurable reset settle time, and indirect MDIO access
      (MDIOACC) for MAC-PHYs without direct PHY register access
 3:   dt-bindings: add adi,spi-oa-tc6
 4:   adin1110: add the OPEN Alliance TC6 probe path
 5:   adin1100: skip the soft reset on ADIN1110/ADIN2111, as it resets
      the whole MAC-PHY

The ADIN2111 is not supported in OPEN Alliance TC6 mode yet.

Testing: Raspberry Pi 4 with an EVAL-ADIN1110EBZ, SPI at 25 MHz, against
a 10BASE-T1L link partner. OPEN Alliance TC6 mode: probe/remove 20x,
link up/down under traffic, frame sizes 42-1514 bytes, flood ping,
~9.4 Mbit/s TCP in each direction, 0% loss on 10 Mbit/s bidirectional
UDP, kmemleak clean, also on a debug kernel (KASAN, lockdep). Generic SPI
mode: no change in results with and without the series.

Known limitations, unchanged by this series:
 - A "Config unsync" error (e.g. after a chip reset) makes oa_tc6
   disable the device until the driver is reloaded.
 - Secondary unicast and multicast address lists are not programmed
   into the MAC filter, as in the generic SPI path.

Open question: indirect MDIO is used automatically when STDCAP.DPRAC is
not set. Would you prefer an explicit quirk flag instead?

Parts of the code and of the commit messages were developed with the
help of an AI assistant (Claude Opus 5.5); all changes were reviewed and
tested on hardware by the submitter. Patches 1-4 were also reviewed with
Sashiko (Claude Opus 5.5) before sending. Patch 5 is too small a change
to merit a Sashiko review.

Ciprian Regus (4):
  net: ethernet: oa_tc6: Allow custom reset settle time values
  net: ethernet: oa_tc6: Add support for MDIO indirect access
  dt-bindings: net: adi,adin1110: Add adi,spi-oa-tc6
  net: ethernet: adi: adin1110: Add OA TC6 protocol support for ADIN1110

Iustin Stolniceanu (1):
  net: phy: adin1100: Skip the soft reset on ADIN1110/ADIN2111

 .../devicetree/bindings/net/adi,adin1110.yaml |   6 +
 drivers/net/ethernet/adi/Kconfig              |   1 +
 drivers/net/ethernet/adi/adin1110.c           | 186 ++++++++++++++++-
 drivers/net/ethernet/oa_tc6.c                 | 189 ++++++++++++++++--
 drivers/net/phy/adin1100.c                    |   9 +
 include/linux/oa_tc6.h                        |  18 ++
 6 files changed, 388 insertions(+), 21 deletions(-)

-- 
2.43.0

[PATCH net-next 1/5] net: ethernet: oa_tc6: Allow custom reset settle time values

[Iustin Stolniceanu]

From: Ciprian Regus <ciprian.regus@analog.com>

oa_tc6_init() waits a fixed 1 ms after deasserting the reset GPIO
before accessing the MAC-PHY. The reset timing parameters of a MAC-PHY
device are outside of the OA TC6 scope. For example, the ADIN1110 needs
up to 50 ms after RESET is deasserted before its registers can be
accessed.

Add a reset_settle_us field to struct oa_tc6_quirks so drivers can
set this time. If it is not set, the GPIO reset keeps the existing
1 ms wait.

When set, also apply the wait after the software reset, before polling
STATUS0 for RESETC. This is needed for devices that tristate their SDO
pin during a reset. Drivers that don't set reset_settle_us keep the
current behaviour.

Signed-off-by: Ciprian Regus <ciprian.regus@analog.com>
Co-developed-by: Iustin Stolniceanu <iustin.stolniceanu@analog.com>
Signed-off-by: Iustin Stolniceanu <iustin.stolniceanu@analog.com>
---
 drivers/net/ethernet/oa_tc6.c | 18 ++++++++++++++----
 include/linux/oa_tc6.h        |  2 ++
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/oa_tc6.c b/drivers/net/ethernet/oa_tc6.c
index 364027c39fa4..68437b226528 100644
--- a/drivers/net/ethernet/oa_tc6.c
+++ b/drivers/net/ethernet/oa_tc6.c
@@ -89,6 +89,7 @@ struct oa_tc6 {
 	bool int_flag;
 	bool disable_traffic;
 	bool prot_ctrl;
+	u32 reset_settle_us;
 	enum oa_tc6_quirk_flag quirk_flags;
 	struct gpio_desc *reset_gpio;
 };
@@ -652,6 +653,9 @@ static int oa_tc6_sw_reset_macphy(struct oa_tc6 *tc6)
 	if (ret)
 		return ret;
 
+	if (tc6->reset_settle_us)
+		fsleep(tc6->reset_settle_us);
+
 	/* Poll for soft reset complete for every 1ms until 1s timeout */
 	ret = readx_poll_timeout(oa_tc6_read_status0, tc6, regval,
 				 regval & OA_TC6_STATUS0_RESETC,
@@ -1474,8 +1478,10 @@ struct oa_tc6 *oa_tc6_init(struct spi_device *spi, struct net_device *netdev,
 	mutex_init(&tc6->spi_ctrl_lock);
 	spin_lock_init(&tc6->tx_skb_lock);
 
-	if (quirks)
+	if (quirks) {
 		tc6->quirk_flags = quirks->quirk_flags;
+		tc6->reset_settle_us = quirks->reset_settle_us;
+	}
 
 	/* Set the SPI controller to pump at realtime priority */
 	tc6->spi->rt = true;
@@ -1515,12 +1521,16 @@ struct oa_tc6 *oa_tc6_init(struct spi_device *spi, struct net_device *netdev,
 					     "failed to get reset gpio\n"));
 
 	if (tc6->reset_gpio) {
-		/* Keep the reset asserted for 10 us and then allow 1 ms of
-		 * settle time for the crystal oscillator startup.
+		/* Keep the reset asserted for 10 us and then allow the reset
+		 * settle time (1 ms by default) for the crystal oscillator
+		 * startup.
 		 */
 		fsleep(10);
 		gpiod_set_value_cansleep(tc6->reset_gpio, 0);
-		fsleep(1000);
+		if (tc6->reset_settle_us)
+			fsleep(tc6->reset_settle_us);
+		else
+			fsleep(1000);
 	}
 
 	/* Check the PROTE bit status so that we can reset the device */
diff --git a/include/linux/oa_tc6.h b/include/linux/oa_tc6.h
index 27f652d4920b..139dd4c33950 100644
--- a/include/linux/oa_tc6.h
+++ b/include/linux/oa_tc6.h
@@ -72,6 +72,8 @@ enum oa_tc6_quirk_flag {
 
 struct oa_tc6_quirks {
 	enum oa_tc6_quirk_flag quirk_flags;
+	/* Wait after the GPIO reset (default 1 ms) and the software reset */
+	u32 reset_settle_us;
 };
 
 struct oa_tc6 *oa_tc6_init(struct spi_device *spi, struct net_device *netdev,
-- 
2.43.0

[PATCH net-next 2/5] net: ethernet: oa_tc6: Add support for MDIO indirect access

[Iustin Stolniceanu]

From: Ciprian Regus <ciprian.regus@analog.com>

The OPEN Alliance TC6 specification defines two ways for the SPI host
to access the registers of the PHY integrated in a MAC-PHY: direct
access, where the PHY registers are mapped into the MAC-PHY register
space, and indirect access, through the MDIOACC registers. A MAC-PHY
reports support for direct access through the DPRAC bit in the STDCAP
register.

The framework currently supports only direct access and fails to
register the MDIO bus when DPRAC is not set.

Read STDCAP when registering the MDIO bus and, if direct access is not
supported, implement the Clause 22 and Clause 45 MDIO operations as
indirect transactions through MDIOACC: for Clause 45, write the
address command to MDIOACC0 and the read or write command to
MDIOACC1; for Clause 22, write the command to MDIOACC1. Then poll
for TRDONE.

If TAERR (turnaround error) is set, no PHY answered at that address
and the DATA field must be ignored. Return 0xffff in that case, as
for an empty address on an MDIO bus, so that the PHY bus scan skips
the address instead of failing. Return -EIO for a write.

Signed-off-by: Ciprian Regus <ciprian.regus@analog.com>
Signed-off-by: Iustin Stolniceanu <iustin.stolniceanu@analog.com>
---
 drivers/net/ethernet/oa_tc6.c | 171 +++++++++++++++++++++++++++++++---
 include/linux/oa_tc6.h        |  15 +++
 2 files changed, 171 insertions(+), 15 deletions(-)

diff --git a/drivers/net/ethernet/oa_tc6.c b/drivers/net/ethernet/oa_tc6.c
index 68437b226528..1c67ea0ff22b 100644
--- a/drivers/net/ethernet/oa_tc6.c
+++ b/drivers/net/ethernet/oa_tc6.c
@@ -89,6 +89,7 @@ struct oa_tc6 {
 	bool int_flag;
 	bool disable_traffic;
 	bool prot_ctrl;
+	bool mdio_indirect_mode;
 	u32 reset_settle_us;
 	enum oa_tc6_quirk_flag quirk_flags;
 	struct gpio_desc *reset_gpio;
@@ -435,24 +436,149 @@ int oa_tc6_write_register_mms(struct oa_tc6 *tc6, u8 mms, u16 address,
 }
 EXPORT_SYMBOL_GPL(oa_tc6_write_register_mms);
 
-static int oa_tc6_check_phy_reg_direct_access_capability(struct oa_tc6 *tc6)
+static void oa_tc6_handle_link_change(struct net_device *netdev)
 {
-	u32 regval;
+	phy_print_status(netdev->phydev);
+}
+
+static int oa_tc6_mdioacc_wait_done(struct oa_tc6 *tc6, u32 *regval)
+{
+	int ret, err;
+
+	ret = read_poll_timeout(oa_tc6_read_register, err,
+				err || (*regval & OA_TC6_MDIOACC_TRDONE),
+				100, 30000, false, tc6, OA_TC6_REG_MDIOACC(1),
+				regval);
+	if (ret)
+		return ret;
+
+	return err;
+}
+
+/* On a turnaround error no PHY answered and the DATA field must be ignored.
+ * Return all ones, like an MDIO bus with no PHY at that address, so that
+ * bus scanning skips the address instead of failing.
+ */
+static int oa_tc6_mdioacc_read_data(u32 reg_val)
+{
+	if (reg_val & OA_TC6_MDIOACC_TAERR)
+		return 0xffff;
+
+	return FIELD_GET(OA_TC6_MDIOACC_DATA, reg_val);
+}
+
+static int oa_tc6_mdioacc_write_done(struct oa_tc6 *tc6)
+{
+	u32 reg_val;
 	int ret;
 
-	ret = oa_tc6_read_register(tc6, OA_TC6_REG_STDCAP, &regval);
+	ret = oa_tc6_mdioacc_wait_done(tc6, &reg_val);
 	if (ret)
 		return ret;
 
-	if (!(regval & OA_TC6_STDCAP_DIRECT_PHY_REG_ACCESS))
-		return -ENODEV;
+	return reg_val & OA_TC6_MDIOACC_TAERR ? -EIO : 0;
+}
 
-	return 0;
+static int oa_tc6_indirect_mdiobus_read_c45(struct oa_tc6 *tc6, int addr,
+					    int devnum, int regnum)
+{
+	u32 reg_val;
+	int ret;
+
+	reg_val = FIELD_PREP(OA_TC6_MDIOACC_OP, OA_TC6_MDIOACC_OP_ADDR);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_ST, OA_TC6_MDIOACC_ST_C45);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_PRTAD, addr);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_DEVAD, devnum);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_DATA, regnum);
+
+	ret = oa_tc6_write_register(tc6, OA_TC6_REG_MDIOACC(0), reg_val);
+	if (ret)
+		return ret;
+
+	reg_val = FIELD_PREP(OA_TC6_MDIOACC_OP, OA_TC6_MDIOACC_OP_RD);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_ST, OA_TC6_MDIOACC_ST_C45);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_PRTAD, addr);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_DEVAD, devnum);
+
+	ret = oa_tc6_write_register(tc6, OA_TC6_REG_MDIOACC(1), reg_val);
+	if (ret)
+		return ret;
+
+	ret = oa_tc6_mdioacc_wait_done(tc6, &reg_val);
+	if (ret)
+		return ret;
+
+	return oa_tc6_mdioacc_read_data(reg_val);
 }
 
-static void oa_tc6_handle_link_change(struct net_device *netdev)
+static int oa_tc6_indirect_mdiobus_write_c45(struct oa_tc6 *tc6, int addr,
+					     int devnum, int regnum, u16 val)
 {
-	phy_print_status(netdev->phydev);
+	u32 reg_val;
+	int ret;
+
+	reg_val = FIELD_PREP(OA_TC6_MDIOACC_OP, OA_TC6_MDIOACC_OP_ADDR);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_ST, OA_TC6_MDIOACC_ST_C45);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_PRTAD, addr);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_DEVAD, devnum);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_DATA, regnum);
+
+	ret = oa_tc6_write_register(tc6, OA_TC6_REG_MDIOACC(0), reg_val);
+	if (ret)
+		return ret;
+
+	reg_val = FIELD_PREP(OA_TC6_MDIOACC_OP, OA_TC6_MDIOACC_OP_WR);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_ST, OA_TC6_MDIOACC_ST_C45);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_PRTAD, addr);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_DEVAD, devnum);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_DATA, val);
+
+	ret = oa_tc6_write_register(tc6, OA_TC6_REG_MDIOACC(1), reg_val);
+	if (ret)
+		return ret;
+
+	return oa_tc6_mdioacc_write_done(tc6);
+}
+
+static int oa_tc6_indirect_mdiobus_read(struct oa_tc6 *tc6, int addr,
+					int regnum)
+{
+	u32 reg_val;
+	int ret;
+
+	reg_val = FIELD_PREP(OA_TC6_MDIOACC_OP, OA_TC6_MDIOACC_OP_RD);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_ST, OA_TC6_MDIOACC_ST_C22);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_PRTAD, addr);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_DEVAD, regnum);
+
+	ret = oa_tc6_write_register(tc6, OA_TC6_REG_MDIOACC(1), reg_val);
+	if (ret)
+		return ret;
+
+	ret = oa_tc6_mdioacc_wait_done(tc6, &reg_val);
+	if (ret)
+		return ret;
+
+	return oa_tc6_mdioacc_read_data(reg_val);
+}
+
+static int oa_tc6_indirect_mdiobus_write(struct oa_tc6 *tc6, int addr,
+					 int regnum, u16 val)
+{
+	u32 reg_val;
+	int ret;
+
+	reg_val = FIELD_PREP(OA_TC6_MDIOACC_OP, OA_TC6_MDIOACC_OP_WR);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_ST, OA_TC6_MDIOACC_ST_C22);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_PRTAD, addr);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_DEVAD, regnum);
+	reg_val |= FIELD_PREP(OA_TC6_MDIOACC_DATA, val);
+
+	ret = oa_tc6_write_register(tc6, OA_TC6_REG_MDIOACC(1), reg_val);
+	if (ret)
+		return ret;
+
+	return oa_tc6_mdioacc_write_done(tc6);
 }
 
 static int oa_tc6_mdiobus_read(struct mii_bus *bus, int addr, int regnum)
@@ -461,6 +587,9 @@ static int oa_tc6_mdiobus_read(struct mii_bus *bus, int addr, int regnum)
 	u32 regval;
 	int ret;
 
+	if (tc6->mdio_indirect_mode)
+		return oa_tc6_indirect_mdiobus_read(tc6, addr, regnum);
+
 	ret = oa_tc6_read_register(tc6, OA_TC6_PHY_STD_REG_ADDR_BASE |
 				   (regnum & OA_TC6_PHY_STD_REG_ADDR_MASK),
 				   &regval);
@@ -475,6 +604,9 @@ static int oa_tc6_mdiobus_write(struct mii_bus *bus, int addr, int regnum,
 {
 	struct oa_tc6 *tc6 = bus->priv;
 
+	if (tc6->mdio_indirect_mode)
+		return oa_tc6_indirect_mdiobus_write(tc6, addr, regnum, val);
+
 	return oa_tc6_write_register(tc6, OA_TC6_PHY_STD_REG_ADDR_BASE |
 				     (regnum & OA_TC6_PHY_STD_REG_ADDR_MASK),
 				     val);
@@ -506,6 +638,10 @@ int oa_tc6_mdiobus_read_c45(struct mii_bus *bus, int addr, int devnum,
 	int mms;
 	int ret;
 
+	if (tc6->mdio_indirect_mode)
+		return oa_tc6_indirect_mdiobus_read_c45(tc6, addr, devnum,
+							regnum);
+
 	mms = oa_tc6_get_phy_c45_mms(devnum);
 	if (mms < 0)
 		return mms;
@@ -524,6 +660,10 @@ int oa_tc6_mdiobus_write_c45(struct mii_bus *bus, int addr, int devnum,
 	struct oa_tc6 *tc6 = bus->priv;
 	int mms;
 
+	if (tc6->mdio_indirect_mode)
+		return oa_tc6_indirect_mdiobus_write_c45(tc6, addr, devnum,
+							 regnum, val);
+
 	mms = oa_tc6_get_phy_c45_mms(devnum);
 	if (mms < 0)
 		return mms;
@@ -534,8 +674,16 @@ EXPORT_SYMBOL_GPL(oa_tc6_mdiobus_write_c45);
 
 static int oa_tc6_mdiobus_register(struct oa_tc6 *tc6)
 {
+	u32 regval;
 	int ret;
 
+	ret = oa_tc6_read_register(tc6, OA_TC6_REG_STDCAP, &regval);
+	if (ret)
+		return ret;
+
+	tc6->mdio_indirect_mode = !(OA_TC6_STDCAP_DIRECT_PHY_REG_ACCESS &
+				    regval);
+
 	tc6->mdiobus = mdiobus_alloc();
 	if (!tc6->mdiobus) {
 		netdev_err(tc6->netdev, "MDIO bus alloc failed\n");
@@ -586,13 +734,6 @@ static int oa_tc6_phy_init(struct oa_tc6 *tc6)
 	if (tc6->quirk_flags & OA_TC6_BROKEN_PHY)
 		return 0;
 
-	ret = oa_tc6_check_phy_reg_direct_access_capability(tc6);
-	if (ret) {
-		netdev_err(tc6->netdev,
-			   "Direct PHY register access is not supported by the MAC-PHY\n");
-		return ret;
-	}
-
 	ret = oa_tc6_mdiobus_register(tc6);
 	if (ret)
 		return ret;
diff --git a/include/linux/oa_tc6.h b/include/linux/oa_tc6.h
index 139dd4c33950..e0627b99e569 100644
--- a/include/linux/oa_tc6.h
+++ b/include/linux/oa_tc6.h
@@ -50,6 +50,21 @@
 #define OA_TC6_INT_MASK0_ALL_INTERRUPTS                 (GENMASK(5, 0) | \
 							 GENMASK(12, 7))
 
+#define OA_TC6_REG_MDIOACC(x)	(0x20 + (x))
+#define OA_TC6_MDIOACC_TRDONE	BIT(31)
+#define OA_TC6_MDIOACC_TAERR	BIT(30)
+#define OA_TC6_MDIOACC_ST	GENMASK(29, 28)
+#define OA_TC6_MDIOACC_OP	GENMASK(27, 26)
+#define OA_TC6_MDIOACC_PRTAD	GENMASK(25, 21)
+#define OA_TC6_MDIOACC_DEVAD	GENMASK(20, 16)
+#define OA_TC6_MDIOACC_DATA	GENMASK(15, 0)
+
+#define OA_TC6_MDIOACC_ST_C45		0x0
+#define OA_TC6_MDIOACC_ST_C22		0x1
+#define OA_TC6_MDIOACC_OP_ADDR		0x0
+#define OA_TC6_MDIOACC_OP_WR		0x1
+#define OA_TC6_MDIOACC_OP_RD		0x3
+
 /* PHY Clause 22 registers base address and mask */
 #define OA_TC6_PHY_STD_REG_ADDR_BASE		0xFF00
 #define OA_TC6_PHY_STD_REG_ADDR_MASK		0x1F
-- 
2.43.0

[PATCH net-next 3/5] dt-bindings: net: adi,adin1110: Add adi,spi-oa-tc6

[Iustin Stolniceanu]

From: Ciprian Regus <ciprian.regus@analog.com>

The ADIN1110 and ADIN2111 support two SPI host interface protocols:
the generic SPI protocol and the OPEN Alliance TC6 protocol. The
protocol is selected by the state of the SPI_CFG1 pin, which the device
latches when it comes out of reset, together with SPI_CFG0, which
selects CRC (generic SPI) or protection (OPEN Alliance) mode.

The protocol is set by the board hardware, so the driver must know it
in advance. Add a boolean property to describe a device configured for
the OPEN Alliance TC6 protocol. Without it, the generic SPI protocol is
assumed, as before.

Signed-off-by: Ciprian Regus <ciprian.regus@analog.com>
Signed-off-by: Iustin Stolniceanu <iustin.stolniceanu@analog.com>
---
 Documentation/devicetree/bindings/net/adi,adin1110.yaml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/adi,adin1110.yaml b/Documentation/devicetree/bindings/net/adi,adin1110.yaml
index 0a73e01d7f97..e19b6c94708d 100644
--- a/Documentation/devicetree/bindings/net/adi,adin1110.yaml
+++ b/Documentation/devicetree/bindings/net/adi,adin1110.yaml
@@ -43,6 +43,12 @@ properties:
       Enable CRC8 checks on SPI read/writes.
     type: boolean
 
+  adi,spi-oa-tc6:
+    description: |
+      The device is configured, through the SPI_CFG1 pin, for the
+      Open Alliance TC6 protocol instead of the generic SPI one.
+    type: boolean
+
   interrupts:
     maxItems: 1
 
-- 
2.43.0

[PATCH net-next 4/5] net: ethernet: adi: adin1110: Add OA TC6 protocol support for ADIN1110

[Iustin Stolniceanu]

From: Ciprian Regus <ciprian.regus@analog.com>

The ADIN1110 and ADIN2111 support two SPI host interface protocols,
the generic SPI protocol and the OPEN Alliance TC6 protocol. The
protocol is selected by the state of the SPI_CFG1 pin, which the device
latches when it comes out of reset. The driver currently supports only
the generic SPI protocol.

Add support for the OPEN Alliance TC6 protocol on the ADIN1110, using
the oa_tc6 framework, when the adi,spi-oa-tc6 property is set. The
framework handles the data transfers and the MDIO bus. Register
accesses go through read_reg/write_reg callbacks, so the existing MAC
configuration code is shared by both protocols. The ADIN1110 specific
MAC registers are in MMS 1.

The framework does not append the FCS to transmitted frames, so set
CRC_APPEND in CONFIG2 to let the MAC append it. Also set the port state
to forwarding on open, as the generic SPI path does, otherwise the
broadcast and multicast filters drop all received frames.

The ADIN2111 is not supported in OPEN Alliance TC6 mode yet, and probe
fails with -EOPNOTSUPP.

Signed-off-by: Ciprian Regus <ciprian.regus@analog.com>
Co-developed-by: Iustin Stolniceanu <iustin.stolniceanu@analog.com>
Signed-off-by: Iustin Stolniceanu <iustin.stolniceanu@analog.com>
---
 drivers/net/ethernet/adi/Kconfig    |   1 +
 drivers/net/ethernet/adi/adin1110.c | 186 +++++++++++++++++++++++++++-
 include/linux/oa_tc6.h              |   1 +
 3 files changed, 186 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/adi/Kconfig b/drivers/net/ethernet/adi/Kconfig
index bdb8ff7d15da..c35f68814c21 100644
--- a/drivers/net/ethernet/adi/Kconfig
+++ b/drivers/net/ethernet/adi/Kconfig
@@ -22,6 +22,7 @@ config ADIN1110
 	depends on SPI && NET_SWITCHDEV
 	select CRC8
 	select PHYLIB
+	select OA_TC6
 	help
 	  Say yes here to build support for Analog Devices ADIN1110
 	  Low Power 10BASE-T1L Ethernet MAC-PHY.
diff --git a/drivers/net/ethernet/adi/adin1110.c b/drivers/net/ethernet/adi/adin1110.c
index 53fac3dc8be6..d08b165bf7c4 100644
--- a/drivers/net/ethernet/adi/adin1110.c
+++ b/drivers/net/ethernet/adi/adin1110.c
@@ -19,6 +19,7 @@
 #include <linux/mii.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
+#include <linux/oa_tc6.h>
 #include <linux/regulator/consumer.h>
 #include <linux/phy.h>
 #include <linux/property.h>
@@ -114,6 +115,8 @@
 #define ADIN_MAC_P2_ADDR_SLOT			3
 #define ADIN_MAC_FDB_ADDR_SLOT			4
 
+#define ADIN1110_MMS0_LIMIT			0x30
+
 DECLARE_CRC8_TABLE(adin1110_crc_table);
 
 enum adin1110_chips_id {
@@ -145,6 +148,7 @@ struct adin1110_port_priv {
 	u32				nr;
 	u32				state;
 	struct adin1110_cfg		*cfg;
+	struct oa_tc6			*tc6;
 };
 
 struct adin1110_priv {
@@ -161,6 +165,9 @@ struct adin1110_priv {
 	struct adin1110_port_priv	*ports[ADIN_MAC_MAX_PORTS];
 	char				mii_bus_name[MII_BUS_ID_SIZE];
 	u8				data[ADIN1110_MAX_BUFF] ____cacheline_aligned;
+
+	int (*read_reg)(struct adin1110_priv *priv, u16 reg, u32 *val);
+	int (*write_reg)(struct adin1110_priv *priv, u16 reg, u32 val);
 };
 
 struct adin1110_switchdev_event_work {
@@ -192,7 +199,18 @@ static u8 adin1110_crc_data(u8 *data, u32 len)
 	return crc8(adin1110_crc_table, data, len, 0);
 }
 
-static int adin1110_read_reg(struct adin1110_priv *priv, u16 reg, u32 *val)
+static int adin1110_read_reg_tc6(struct adin1110_priv *priv, u16 reg, u32 *val)
+{
+	struct adin1110_port_priv *port_priv = priv->ports[0];
+
+	if (reg >= ADIN1110_MMS0_LIMIT)
+		return oa_tc6_read_register_mms(port_priv->tc6, OA_TC6_MAC_MMS1,
+						 reg, val);
+
+	return oa_tc6_read_register(port_priv->tc6, reg, val);
+}
+
+static int adin1110_read_reg_generic_spi(struct adin1110_priv *priv, u16 reg, u32 *val)
 {
 	u32 header_len = ADIN1110_RD_HEADER_LEN;
 	u32 read_len = ADIN1110_REG_LEN;
@@ -240,7 +258,23 @@ static int adin1110_read_reg(struct adin1110_priv *priv, u16 reg, u32 *val)
 	return ret;
 }
 
-static int adin1110_write_reg(struct adin1110_priv *priv, u16 reg, u32 val)
+static int adin1110_read_reg(struct adin1110_priv *priv, u16 reg, u32 *val)
+{
+	return priv->read_reg(priv, reg, val);
+}
+
+static int adin1110_write_reg_tc6(struct adin1110_priv *priv, u16 reg, u32 val)
+{
+	struct adin1110_port_priv *port_priv = priv->ports[0];
+
+	if (reg >= ADIN1110_MMS0_LIMIT)
+		return oa_tc6_write_register_mms(port_priv->tc6, OA_TC6_MAC_MMS1,
+						  reg, val);
+
+	return oa_tc6_write_register(port_priv->tc6, reg, val);
+}
+
+static int adin1110_write_reg_generic_spi(struct adin1110_priv *priv, u16 reg, u32 val)
 {
 	u32 header_len = ADIN1110_WR_HEADER_LEN;
 	u32 write_len = ADIN1110_REG_LEN;
@@ -263,6 +297,11 @@ static int adin1110_write_reg(struct adin1110_priv *priv, u16 reg, u32 val)
 	return spi_write(priv->spidev, &priv->data[0], header_len + write_len);
 }
 
+static int adin1110_write_reg(struct adin1110_priv *priv, u16 reg, u32 val)
+{
+	return priv->write_reg(priv, reg, val);
+}
+
 static int adin1110_set_bits(struct adin1110_priv *priv, u16 reg,
 			     unsigned long mask, unsigned long val)
 {
@@ -881,6 +920,22 @@ static void adin1110_set_rx_mode(struct net_device *dev)
 	spin_unlock(&priv->state_lock);
 }
 
+static int adin1110_set_rx_mode_tc6(struct net_device *dev,
+				    struct netdev_hw_addr_list *uc,
+				    struct netdev_hw_addr_list *mc)
+{
+	struct adin1110_port_priv *port_priv = netdev_priv(dev);
+	struct adin1110_priv *priv = port_priv->priv;
+	int ret;
+
+	mutex_lock(&priv->lock);
+	port_priv->flags = dev->flags;
+	ret = adin1110_setup_rx_mode(port_priv);
+	mutex_unlock(&priv->lock);
+
+	return ret;
+}
+
 static int adin1110_net_open(struct net_device *net_dev)
 {
 	struct adin1110_port_priv *port_priv = netdev_priv(net_dev);
@@ -938,6 +993,31 @@ static int adin1110_net_open(struct net_device *net_dev)
 	return 0;
 }
 
+static int adin1110_net_open_tc6(struct net_device *net_dev)
+{
+	struct adin1110_port_priv *port_priv = netdev_priv(net_dev);
+	struct adin1110_priv *priv = port_priv->priv;
+	int ret;
+
+	mutex_lock(&priv->lock);
+
+	/* Needed for the broadcast/multicast filters to forward to the host */
+	port_priv->state = BR_STATE_FORWARDING;
+
+	ret = adin1110_set_mac_address(net_dev, net_dev->dev_addr);
+	mutex_unlock(&priv->lock);
+	if (ret < 0) {
+		netdev_err(net_dev, "Could not set MAC address: %pM, %d\n",
+			   net_dev->dev_addr, ret);
+		return ret;
+	}
+
+	phy_start(net_dev->phydev);
+	netif_start_queue(net_dev);
+
+	return 0;
+}
+
 static int adin1110_net_stop(struct net_device *net_dev)
 {
 	struct adin1110_port_priv *port_priv = netdev_priv(net_dev);
@@ -961,6 +1041,14 @@ static int adin1110_net_stop(struct net_device *net_dev)
 	return 0;
 }
 
+static int adin1110_net_stop_tc6(struct net_device *net_dev)
+{
+	netif_stop_queue(net_dev);
+	phy_stop(net_dev->phydev);
+
+	return 0;
+}
+
 static void adin1110_tx_work(struct work_struct *work)
 {
 	struct adin1110_port_priv *port_priv;
@@ -1006,6 +1094,18 @@ static netdev_tx_t adin1110_start_xmit(struct sk_buff *skb, struct net_device *d
 	return netdev_ret;
 }
 
+static netdev_tx_t adin1110_start_xmit_tc6(struct sk_buff *skb, struct net_device *dev)
+{
+	struct adin1110_port_priv *port_priv = netdev_priv(dev);
+
+	if (skb_put_padto(skb, ETH_ZLEN)) {
+		dev->stats.tx_dropped++;
+		return NETDEV_TX_OK;
+	}
+
+	return oa_tc6_start_xmit(port_priv->tc6, skb);
+}
+
 static void adin1110_ndo_get_stats64(struct net_device *dev,
 				     struct rtnl_link_stats64 *storage)
 {
@@ -1056,6 +1156,16 @@ static const struct net_device_ops adin1110_netdev_ops = {
 	.ndo_get_phys_port_name	= adin1110_ndo_get_phys_port_name,
 };
 
+static const struct net_device_ops adin1110_tc6_netdev_ops = {
+	.ndo_open		= adin1110_net_open_tc6,
+	.ndo_stop		= adin1110_net_stop_tc6,
+	.ndo_eth_ioctl		= adin1110_ioctl,
+	.ndo_start_xmit		= adin1110_start_xmit_tc6,
+	.ndo_set_mac_address	= adin1110_ndo_set_mac_address,
+	.ndo_set_rx_mode_async	= adin1110_set_rx_mode_tc6,
+	.ndo_validate_addr	= eth_validate_addr,
+};
+
 static void adin1110_get_drvinfo(struct net_device *dev,
 				 struct ethtool_drvinfo *di)
 {
@@ -1123,6 +1233,69 @@ static int adin1110_check_spi(struct adin1110_priv *priv)
 	return 0;
 }
 
+static void adin1110_oa_tc6_remove(void *data)
+{
+	oa_tc6_exit(data);
+}
+
+static int adin1110_oa_tc6_probe(struct adin1110_priv *priv)
+{
+	struct adin1110_port_priv *port_priv;
+	struct oa_tc6_quirks quirks = {0};
+	struct net_device *netdev;
+	struct device *dev;
+	int ret;
+
+	dev = &priv->spidev->dev;
+
+	if (priv->cfg->id == ADIN2111_MAC)
+		return dev_err_probe(dev, -EOPNOTSUPP,
+				     "OA TC6 isn't supported for ADIN2111\n");
+
+	netdev = devm_alloc_etherdev(dev, sizeof(*port_priv));
+	if (!netdev)
+		return -ENOMEM;
+
+	port_priv = netdev_priv(netdev);
+	port_priv->netdev = netdev;
+	port_priv->priv = priv;
+	port_priv->cfg = priv->cfg;
+	port_priv->nr = 0;
+	priv->ports[0] = port_priv;
+	SET_NETDEV_DEV(netdev, dev);
+
+	quirks.reset_settle_us = 50000;
+
+	port_priv->tc6 = oa_tc6_init(priv->spidev, netdev, &quirks);
+	if (IS_ERR(port_priv->tc6))
+		return PTR_ERR(port_priv->tc6);
+
+	priv->read_reg = adin1110_read_reg_tc6;
+	priv->write_reg = adin1110_write_reg_tc6;
+
+	ret = devm_add_action_or_reset(dev, adin1110_oa_tc6_remove,
+				       port_priv->tc6);
+	if (ret)
+		return ret;
+
+	/* The OA TC6 framework doesn't append the FCS, let the MAC do it. */
+	ret = adin1110_set_bits(priv, ADIN1110_CONFIG2, ADIN1110_CRC_APPEND,
+				ADIN1110_CRC_APPEND);
+	if (ret < 0)
+		return ret;
+
+	if (device_get_ethdev_address(dev, netdev))
+		eth_hw_addr_random(netdev);
+
+	netdev->if_port = IF_PORT_10BASET;
+	netdev->netdev_ops = &adin1110_tc6_netdev_ops;
+	netdev->ethtool_ops = &adin1110_ethtool_ops;
+	netdev->priv_flags |= IFF_UNICAST_FLT;
+	netdev->netns_immutable = true;
+
+	return devm_register_netdev(dev, netdev);
+}
+
 static int adin1110_hw_forwarding(struct adin1110_priv *priv, bool enable)
 {
 	int ret;
@@ -1649,6 +1822,7 @@ static int adin1110_probe(struct spi_device *spi)
 	const struct spi_device_id *dev_id = spi_get_device_id(spi);
 	struct device *dev = &spi->dev;
 	struct adin1110_priv *priv;
+	bool oa_tc6_protocol;
 	int ret;
 
 	priv = devm_kzalloc(dev, sizeof(struct adin1110_priv), GFP_KERNEL);
@@ -1663,11 +1837,19 @@ static int adin1110_probe(struct spi_device *spi)
 	mutex_init(&priv->lock);
 	spin_lock_init(&priv->state_lock);
 
+	oa_tc6_protocol = device_property_read_bool(dev, "adi,spi-oa-tc6");
+
+	if (oa_tc6_protocol)
+		return adin1110_oa_tc6_probe(priv);
+
 	/* use of CRC on control and data transactions is pin dependent */
 	priv->append_crc = device_property_read_bool(dev, "adi,spi-crc");
 	if (priv->append_crc)
 		crc8_populate_msb(adin1110_crc_table, 0x7);
 
+	priv->read_reg = adin1110_read_reg_generic_spi;
+	priv->write_reg = adin1110_write_reg_generic_spi;
+
 	ret = adin1110_check_spi(priv);
 	if (ret < 0) {
 		dev_err(dev, "Probe SPI Read check failed: %d\n", ret);
diff --git a/include/linux/oa_tc6.h b/include/linux/oa_tc6.h
index e0627b99e569..2fd051e1c604 100644
--- a/include/linux/oa_tc6.h
+++ b/include/linux/oa_tc6.h
@@ -79,6 +79,7 @@
 #define OA_TC6_PHY_C45_AUTO_NEG_MMS5		5	/* MMD 7 */
 #define OA_TC6_PHY_C45_POWER_UNIT_MMS6		6	/* MMD 13 */
 
+struct mii_bus;
 struct oa_tc6;
 
 enum oa_tc6_quirk_flag {
-- 
2.43.0

[PATCH net-next 5/5] net: phy: adin1100: Skip the soft reset on ADIN1110/ADIN2111

[Iustin Stolniceanu]

The ADIN1110 and ADIN2111 MAC-PHYs integrate the ADIN1100 PHY and use
this driver. On these devices, CRSM_SFT_RST resets the whole chip, not
only the PHY, undoing the configuration done by the MAC driver before
the PHY is attached. MDIO reads also return stale data until the reset
completes.

The MAC driver already resets the chip before attaching the PHY, so
skip the soft reset on these devices.

Signed-off-by: Iustin Stolniceanu <iustin.stolniceanu@analog.com>
---
 drivers/net/phy/adin1100.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/phy/adin1100.c b/drivers/net/phy/adin1100.c
index 8f9753d4318c..7b4e68285a9d 100644
--- a/drivers/net/phy/adin1100.c
+++ b/drivers/net/phy/adin1100.c
@@ -232,6 +232,15 @@ static int adin_soft_reset(struct phy_device *phydev)
 {
 	int ret;
 
+	/* On the ADIN1110/ADIN2111 MAC-PHYs, CRSM_SFT_RST resets the whole
+	 * chip, undoing the MAC driver's setup, and MDIO reads return stale
+	 * data until it completes. The MAC driver has already reset the
+	 * chip, so skip it here.
+	 */
+	if (phy_id_compare_model(phydev->phy_id, PHY_ID_ADIN1110) ||
+	    phy_id_compare_model(phydev->phy_id, PHY_ID_ADIN2111))
+		return 0;
+
 	ret = phy_set_bits_mmd(phydev, MDIO_MMD_VEND1, ADIN_CRSM_SFT_RST, ADIN_CRSM_SFT_RST_EN);
 	if (ret < 0)
 		return ret;
-- 
2.43.0

Re: [PATCH net-next 0/5] net: ethernet: adi: adin1110: Add OPEN Alliance TC6 support

[Andrew Lunn]

On Tue, Nov 03, 2026 at 06:09:13PM +0200, Iustin Stolniceanu wrote:
> The ADIN1110 supports two SPI host interface protocols: the generic SPI
> protocol, which the adin1110 driver implements today, and the OPEN
> Alliance TC6 protocol. The protocol is selected by the SPI_CFG1 pin,
> which the device latches when it comes out of reset.

Is it possible to read the status of this pin from a register?

   Andrew

Re: [PATCH net-next 0/5] net: ethernet: adi: adin1110: Add OPEN Alliance TC6 support

[Andrew Lunn]

> Open question: indirect MDIO is used automatically when STDCAP.DPRAC is
> not set. Would you prefer an explicit quirk flag instead?

I would say the current code is correct. Lets assume vendors don't
mess up and set STDCAP.DPRAC when they in fact don't support direct
access, until a vendor does actually mess up. Then we can add a quirk.

	Andrew