[PATCH v2 00/15] net: phy: adin: add support for Analog Devices PHYs

[PATCH v2 00/15] net: phy: adin: add support for Analog Devices PHYs

[Alexandru Ardelean]

This changeset adds support for Analog Devices Industrial Ethernet PHYs.
Particularly the PHYs this driver adds support for:
 * ADIN1200 - Robust, Industrial, Low Power 10/100 Ethernet PHY
 * ADIN1300 - Robust, Industrial, Low Latency 10/100/1000 Gigabit
   Ethernet PHY

The 2 chips are pin & register compatible with one another. The main
difference being that ADIN1200 doesn't operate in gigabit mode.

The chips can be operated by the Generic PHY driver as well via the
standard IEEE PHY registers (0x0000 - 0x000F) which are supported by the
kernel as well. This assumes that configuration of the PHY has been done
completely in HW, according to spec, i.e. no extra SW configuration
required.

This changeset also implements the ability to configure the chips via SW
registers.

Datasheets:
  https://www.analog.com/media/en/technical-documentation/data-sheets/ADIN1300.pdf
  https://www.analog.com/media/en/technical-documentation/data-sheets/ADIN1200.pdf

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>

Alexandru Ardelean (15):
  net: phy: adin: add support for Analog Devices PHYs
  net: phy: adin: hook genphy_read_abilities() to get_features
  net: phy: adin: hook genphy_{suspend,resume} into the driver
  net: phy: adin: add support for interrupts
  net: phy: adin: add {write,read}_mmd hooks
  net: phy: adin: configure RGMII/RMII/MII modes on config
  net: phy: adin: make RGMII internal delays configurable
  net: phy: adin: make RMII fifo depth configurable
  net: phy: adin: add support MDI/MDIX/Auto-MDI selection
  net: phy: adin: add EEE translation layer from Clause 45 to Clause 22
  net: phy: adin: implement PHY subsystem software reset
  net: phy: adin: implement Energy Detect Powerdown mode
  net: phy: adin: configure downshift on config_init
  net: phy: adin: add ethtool get_stats support
  dt-bindings: net: add bindings for ADIN PHY driver

 .../devicetree/bindings/net/adi,adin.yaml     |  76 ++
 MAINTAINERS                                   |   8 +
 drivers/net/phy/Kconfig                       |   9 +
 drivers/net/phy/Makefile                      |   1 +
 drivers/net/phy/adin.c                        | 732 ++++++++++++++++++
 5 files changed, 826 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/adi,adin.yaml
 create mode 100644 drivers/net/phy/adin.c

-- 


Changelog v1 -> v2:
[ patch numbers are from v1 ]

* patch 01/16: net: phy: adin: add support for Analog Devices PHYs
   - return genphy_config_init() directly
   - remove `features` field; the ADIN1200/ADIN1300 support the standard IEEE regs
     for reading link caps
   - use PHY_ID_MATCH_MODEL() macro in `adin_tbl` and `adin_driver` tables
* added new patch: net: phy: adin: hook genphy_read_abilities() to get_features
   - this hooks the genphy_read_abilities() to `get_features` hook to make sure
     that features are initialized correctly
* patch 03/16: net: phy: adin: add support for interrupts
   - removed deprecated `.flags = PHY_HAS_INTERRUPT,`
   - compress return code in `adin_phy_ack_intr()`
* patch 04/16: net: phy: adin: add {write,read}_mmd hooks
   - changed reg-style to 4 digit format; it was the only place where this was
     inconsistent
* patch 05/16: net: phy: adin: configure RGMII/RMII/MII modes on config
   - removed `goto` statements; used `phy_clear_bits_mmd()` for clean
     disable-n-exit path
   - dev_info -> phydev_dbg
   - fixed `phy_interface_t` type conversion for rc; reverted back to `int` in 
     `genphy_config_init()`
   - added missing space in commit description
     `For RGMII with internal delays (modes RGMII_ID, RGMII_TXID, RGMII_RXID)`
   - overall: things have been simplified since this no longer needs to account
     for `phy-mode-internal` thingi/patch
* dropped: patch 06/16: net: phy: adin: support PHY mode converters
* patch 07/16: net: phy: adin: make RGMII internal delays configurable
   - changed mechanism, to specify delays in pico-seconds and convert them
     to register values; mechanism will be used for RMII fifo depth as well
   - fixed masking bug for internal delays when reworking this mechanism
   - changed DT props `adi,{rx,tx}-internal-delay` -> `adi,{rx,tx}-internal-delay-ps`
* patch 08/16: net: phy: adin: make RMII fifo depth configurable
   - using same mechanism to access access RMII fifo depth bits
   - changed DT prop `adi,fifo-depth` -> `adi,fifo-depth-bits`
* patch 10/16: net: phy: adin: add EEE translation layer for Clause 22
   - use `phydev_err` instead of `pr_err()` in `adin_cl22_to_adin_reg()` helper
   - renamed types from cl22 -> cl45 or clause22 -> clause45; the translation
     is from Clause 45 to Clause 22 indirect access
* patch 11/16: net: phy: adin: PHY reset mechanisms
   - dropped GPIO logic; using phylib's
   - doing SW subsystem reset if there is no reset GPIO defined via phylib
* dropped: patch 12/16: net: phy: adin: read EEE setting from device-tree
* patch 14/16: net: phy: adin: make sure down-speed auto-neg is enabled
   - use `phy_set_bits` to enable/disable down-speed
   - implemented downshift similar to marvell driver; also configuring
     num-speed retries
* patch 15/16:  net: phy: adin: add ethtool get_stats support
   - changed `do_not_inc` -> `do_not_accumulate`
   - in commit comment: `incremented` -> `accumulated`
   - use `strlcpy()` instead of `memcpy()` for get_stats
* patch 16/16: dt-bindings: net: add bindings for ADIN PHY driver
   - updated bindings with all stuff that was left in the driver; some things
     went away (like reset-gpio)
   - implemented Rob's suggestions

2.20.1

[PATCH v2 01/15] net: phy: adin: add support for Analog Devices PHYs

[Alexandru Ardelean]

This change adds support for Analog Devices Industrial Ethernet PHYs.
Particularly the PHYs this driver adds support for:
 * ADIN1200 - Robust, Industrial, Low Power 10/100 Ethernet PHY
 * ADIN1300 - Robust, Industrial, Low Latency 10/100/1000 Gigabit
   Ethernet PHY

The 2 chips are pin & register compatible with one another. The main
difference being that ADIN1200 doesn't operate in gigabit mode.

The chips can be operated by the Generic PHY driver as well via the
standard IEEE PHY registers (0x0000 - 0x000F) which are supported by the
kernel as well. This assumes that configuration of the PHY has been done
completely in HW, according to spec.

Configuration can also be done via registers, which will be supported by
this driver.

Datasheets:
  https://www.analog.com/media/en/technical-documentation/data-sheets/ADIN1300.pdf
  https://www.analog.com/media/en/technical-documentation/data-sheets/ADIN1200.pdf

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 MAINTAINERS              |  7 ++++++
 drivers/net/phy/Kconfig  |  9 ++++++++
 drivers/net/phy/Makefile |  1 +
 drivers/net/phy/adin.c   | 49 ++++++++++++++++++++++++++++++++++++++++
 4 files changed, 66 insertions(+)
 create mode 100644 drivers/net/phy/adin.c

diff --git a/MAINTAINERS b/MAINTAINERS
index e352550a6895..e8aa8a667864 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -938,6 +938,13 @@ S:	Supported
 F:	drivers/mux/adgs1408.c
 F:	Documentation/devicetree/bindings/mux/adi,adgs1408.txt
 
+ANALOG DEVICES INC ADIN DRIVER
+M:	Alexandru Ardelean <alexaundru.ardelean@analog.com>
+L:	netdev@vger.kernel.org
+W:	http://ez.analog.com/community/linux-device-drivers
+S:	Supported
+F:	drivers/net/phy/adin.c
+
 ANALOG DEVICES INC ADIS DRIVER LIBRARY
 M:	Alexandru Ardelean <alexandru.ardelean@analog.com>
 S:	Supported
diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 48ca213c0ada..03be30cde552 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -257,6 +257,15 @@ config SFP
 	depends on HWMON || HWMON=n
 	select MDIO_I2C
 
+config ADIN_PHY
+	tristate "Analog Devices Industrial Ethernet PHYs"
+	help
+	  Adds support for the Analog Devices Industrial Ethernet PHYs.
+	  Currently supports the:
+	  - ADIN1200 - Robust,Industrial, Low Power 10/100 Ethernet PHY
+	  - ADIN1300 - Robust,Industrial, Low Latency 10/100/1000 Gigabit
+	    Ethernet PHY
+
 config AMD_PHY
 	tristate "AMD PHYs"
 	---help---
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index ba07c27e4208..a03437e091f3 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -47,6 +47,7 @@ obj-$(CONFIG_SFP)		+= sfp.o
 sfp-obj-$(CONFIG_SFP)		+= sfp-bus.o
 obj-y				+= $(sfp-obj-y) $(sfp-obj-m)
 
+obj-$(CONFIG_ADIN_PHY)		+= adin.o
 obj-$(CONFIG_AMD_PHY)		+= amd.o
 aquantia-objs			+= aquantia_main.o
 ifdef CONFIG_HWMON
diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
new file mode 100644
index 000000000000..6d7af4743957
--- /dev/null
+++ b/drivers/net/phy/adin.c
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-2.0+
+/**
+ *  Driver for Analog Devices Industrial Ethernet PHYs
+ *
+ * Copyright 2019 Analog Devices Inc.
+ */
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mii.h>
+#include <linux/phy.h>
+
+#define PHY_ID_ADIN1200				0x0283bc20
+#define PHY_ID_ADIN1300				0x0283bc30
+
+static int adin_config_init(struct phy_device *phydev)
+{
+	return genphy_config_init(phydev);
+}
+
+static struct phy_driver adin_driver[] = {
+	{
+		PHY_ID_MATCH_MODEL(PHY_ID_ADIN1200),
+		.name		= "ADIN1200",
+		.config_init	= adin_config_init,
+		.config_aneg	= genphy_config_aneg,
+		.read_status	= genphy_read_status,
+	},
+	{
+		PHY_ID_MATCH_MODEL(PHY_ID_ADIN1300),
+		.name		= "ADIN1300",
+		.config_init	= adin_config_init,
+		.config_aneg	= genphy_config_aneg,
+		.read_status	= genphy_read_status,
+	},
+};
+
+module_phy_driver(adin_driver);
+
+static struct mdio_device_id __maybe_unused adin_tbl[] = {
+	{ PHY_ID_MATCH_MODEL(PHY_ID_ADIN1200) },
+	{ PHY_ID_MATCH_MODEL(PHY_ID_ADIN1300) },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(mdio, adin_tbl);
+MODULE_DESCRIPTION("Analog Devices Industrial Ethernet PHY driver");
+MODULE_LICENSE("GPL");
-- 
2.20.1

[PATCH v2 02/15] net: phy: adin: hook genphy_read_abilities() to get_features

[Alexandru Ardelean]

The ADIN PHYs can operate with Clause 45, however they are not typical for
how phylib considers Clause 45 PHYs.

If the `features` field & the `get_features` hook are unspecified, and the
device wants to operate via Clause 45, it would also try to read features
via the `genphy_c45_pma_read_abilities()`, which will try to read PMA regs
that are unsupported.

Hooking the `genphy_read_abilities()` function to the `get_features` hook
will ensure that this does not happen and the PHY features are read
correctly regardless of Clause 22 or Clause 45 operation.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/net/phy/adin.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
index 6d7af4743957..879797d076e0 100644
--- a/drivers/net/phy/adin.c
+++ b/drivers/net/phy/adin.c
@@ -26,6 +26,7 @@ static struct phy_driver adin_driver[] = {
 		.config_init	= adin_config_init,
 		.config_aneg	= genphy_config_aneg,
 		.read_status	= genphy_read_status,
+		.get_features	= genphy_read_abilities,
 	},
 	{
 		PHY_ID_MATCH_MODEL(PHY_ID_ADIN1300),
@@ -33,6 +34,7 @@ static struct phy_driver adin_driver[] = {
 		.config_init	= adin_config_init,
 		.config_aneg	= genphy_config_aneg,
 		.read_status	= genphy_read_status,
+		.get_features	= genphy_read_abilities,
 	},
 };
 
-- 
2.20.1

[PATCH v2 03/15] net: phy: adin: hook genphy_{suspend,resume} into the driver

[Alexandru Ardelean]

The chip supports standard suspend/resume via BMCR reg.
Hook these functions into the `adin` driver.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/net/phy/adin.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
index 879797d076e0..45490fbe273b 100644
--- a/drivers/net/phy/adin.c
+++ b/drivers/net/phy/adin.c
@@ -27,6 +27,8 @@ static struct phy_driver adin_driver[] = {
 		.config_aneg	= genphy_config_aneg,
 		.read_status	= genphy_read_status,
 		.get_features	= genphy_read_abilities,
+		.resume		= genphy_resume,
+		.suspend	= genphy_suspend,
 	},
 	{
 		PHY_ID_MATCH_MODEL(PHY_ID_ADIN1300),
@@ -35,6 +37,8 @@ static struct phy_driver adin_driver[] = {
 		.config_aneg	= genphy_config_aneg,
 		.read_status	= genphy_read_status,
 		.get_features	= genphy_read_abilities,
+		.resume		= genphy_resume,
+		.suspend	= genphy_suspend,
 	},
 };
 
-- 
2.20.1

[PATCH v2 04/15] net: phy: adin: add support for interrupts

[Alexandru Ardelean]

This change adds support for enabling PHY interrupts that can be used by
the PHY framework to get signal for link/speed/auto-negotiation changes.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/net/phy/adin.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
index 45490fbe273b..69000fb16704 100644
--- a/drivers/net/phy/adin.c
+++ b/drivers/net/phy/adin.c
@@ -14,11 +14,45 @@
 #define PHY_ID_ADIN1200				0x0283bc20
 #define PHY_ID_ADIN1300				0x0283bc30
 
+#define ADIN1300_INT_MASK_REG			0x0018
+#define   ADIN1300_INT_MDIO_SYNC_EN		BIT(9)
+#define   ADIN1300_INT_ANEG_STAT_CHNG_EN	BIT(8)
+#define   ADIN1300_INT_ANEG_PAGE_RX_EN		BIT(6)
+#define   ADIN1300_INT_IDLE_ERR_CNT_EN		BIT(5)
+#define   ADIN1300_INT_MAC_FIFO_OU_EN		BIT(4)
+#define   ADIN1300_INT_RX_STAT_CHNG_EN		BIT(3)
+#define   ADIN1300_INT_LINK_STAT_CHNG_EN	BIT(2)
+#define   ADIN1300_INT_SPEED_CHNG_EN		BIT(1)
+#define   ADIN1300_INT_HW_IRQ_EN		BIT(0)
+#define ADIN1300_INT_MASK_EN	\
+	(ADIN1300_INT_ANEG_STAT_CHNG_EN | ADIN1300_INT_ANEG_PAGE_RX_EN | \
+	 ADIN1300_INT_LINK_STAT_CHNG_EN | ADIN1300_INT_SPEED_CHNG_EN | \
+	 ADIN1300_INT_HW_IRQ_EN)
+#define ADIN1300_INT_STATUS_REG			0x0019
+
 static int adin_config_init(struct phy_device *phydev)
 {
 	return genphy_config_init(phydev);
 }
 
+static int adin_phy_ack_intr(struct phy_device *phydev)
+{
+	/* Clear pending interrupts */
+	int rc = phy_read(phydev, ADIN1300_INT_STATUS_REG);
+
+	return rc < 0 ? rc : 0;
+}
+
+static int adin_phy_config_intr(struct phy_device *phydev)
+{
+	if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
+		return phy_set_bits(phydev, ADIN1300_INT_MASK_REG,
+				    ADIN1300_INT_MASK_EN);
+
+	return phy_clear_bits(phydev, ADIN1300_INT_MASK_REG,
+			      ADIN1300_INT_MASK_EN);
+}
+
 static struct phy_driver adin_driver[] = {
 	{
 		PHY_ID_MATCH_MODEL(PHY_ID_ADIN1200),
@@ -27,6 +61,8 @@ static struct phy_driver adin_driver[] = {
 		.config_aneg	= genphy_config_aneg,
 		.read_status	= genphy_read_status,
 		.get_features	= genphy_read_abilities,
+		.ack_interrupt	= adin_phy_ack_intr,
+		.config_intr	= adin_phy_config_intr,
 		.resume		= genphy_resume,
 		.suspend	= genphy_suspend,
 	},
@@ -37,6 +73,8 @@ static struct phy_driver adin_driver[] = {
 		.config_aneg	= genphy_config_aneg,
 		.read_status	= genphy_read_status,
 		.get_features	= genphy_read_abilities,
+		.ack_interrupt	= adin_phy_ack_intr,
+		.config_intr	= adin_phy_config_intr,
 		.resume		= genphy_resume,
 		.suspend	= genphy_suspend,
 	},
-- 
2.20.1

[PATCH v2 05/15] net: phy: adin: add {write,read}_mmd hooks

[Alexandru Ardelean]

Both ADIN1200 & ADIN1300 support Clause 45 access.
The Extended Management Interface (EMI) registers are accessible via both
Clause 45 (at register MDIO_MMD_VEND1) and using Clause 22.

However, the Clause 22 MMD access operations differ from the implementation
in the kernel, in the sense that it uses registers ExtRegPtr (0x10) &
ExtRegData (0x11) to access Clause 45 & EMI registers.

The indirect access is done via the following mechanism (for both R/W):
1. Write the address of the register in the ExtRegPtr
2. Read/write the value of the register (written at ExtRegPtr)

This mechanism is needed to manage configuration of chip settings and to
access EEE registers (via Clause 22).

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/net/phy/adin.c | 46 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
index 69000fb16704..a833e329be6f 100644
--- a/drivers/net/phy/adin.c
+++ b/drivers/net/phy/adin.c
@@ -14,6 +14,9 @@
 #define PHY_ID_ADIN1200				0x0283bc20
 #define PHY_ID_ADIN1300				0x0283bc30
 
+#define ADIN1300_MII_EXT_REG_PTR		0x0010
+#define ADIN1300_MII_EXT_REG_DATA		0x0011
+
 #define ADIN1300_INT_MASK_REG			0x0018
 #define   ADIN1300_INT_MDIO_SYNC_EN		BIT(9)
 #define   ADIN1300_INT_ANEG_STAT_CHNG_EN	BIT(8)
@@ -53,6 +56,45 @@ static int adin_phy_config_intr(struct phy_device *phydev)
 			      ADIN1300_INT_MASK_EN);
 }
 
+static int adin_read_mmd(struct phy_device *phydev, int devad, u16 regnum)
+{
+	struct mii_bus *bus = phydev->mdio.bus;
+	int phy_addr = phydev->mdio.addr;
+	int err;
+
+	if (phydev->is_c45) {
+		u32 addr = MII_ADDR_C45 | (devad << 16) | (regnum & 0xffff);
+
+		return __mdiobus_read(bus, phy_addr, addr);
+	}
+
+	err = __mdiobus_write(bus, phy_addr, ADIN1300_MII_EXT_REG_PTR, regnum);
+	if (err)
+		return err;
+
+	return __mdiobus_read(bus, phy_addr, ADIN1300_MII_EXT_REG_DATA);
+}
+
+static int adin_write_mmd(struct phy_device *phydev, int devad, u16 regnum,
+			  u16 val)
+{
+	struct mii_bus *bus = phydev->mdio.bus;
+	int phy_addr = phydev->mdio.addr;
+	int err;
+
+	if (phydev->is_c45) {
+		u32 addr = MII_ADDR_C45 | (devad << 16) | (regnum & 0xffff);
+
+		return __mdiobus_write(bus, phy_addr, addr, val);
+	}
+
+	err = __mdiobus_write(bus, phy_addr, ADIN1300_MII_EXT_REG_PTR, regnum);
+	if (err)
+		return err;
+
+	return __mdiobus_write(bus, phy_addr, ADIN1300_MII_EXT_REG_DATA, val);
+}
+
 static struct phy_driver adin_driver[] = {
 	{
 		PHY_ID_MATCH_MODEL(PHY_ID_ADIN1200),
@@ -65,6 +107,8 @@ static struct phy_driver adin_driver[] = {
 		.config_intr	= adin_phy_config_intr,
 		.resume		= genphy_resume,
 		.suspend	= genphy_suspend,
+		.read_mmd	= adin_read_mmd,
+		.write_mmd	= adin_write_mmd,
 	},
 	{
 		PHY_ID_MATCH_MODEL(PHY_ID_ADIN1300),
@@ -77,6 +121,8 @@ static struct phy_driver adin_driver[] = {
 		.config_intr	= adin_phy_config_intr,
 		.resume		= genphy_resume,
 		.suspend	= genphy_suspend,
+		.read_mmd	= adin_read_mmd,
+		.write_mmd	= adin_write_mmd,
 	},
 };
 
-- 
2.20.1

[PATCH v2 06/15] net: phy: adin: configure RGMII/RMII/MII modes on config

[Alexandru Ardelean]

The ADIN1300 chip supports RGMII, RMII & MII modes. Default (if
unconfigured) is RGMII.
This change adds support for configuring these modes via the device
registers.

For RGMII with internal delays (modes RGMII_ID,RGMII_TXID, RGMII_RXID),
the default delay is 2 ns. This can be configurable and will be done in
a subsequent change.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/net/phy/adin.c | 79 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 78 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
index a833e329be6f..9169d6c08383 100644
--- a/drivers/net/phy/adin.c
+++ b/drivers/net/phy/adin.c
@@ -33,9 +33,86 @@
 	 ADIN1300_INT_HW_IRQ_EN)
 #define ADIN1300_INT_STATUS_REG			0x0019
 
+#define ADIN1300_GE_RGMII_CFG_REG		0xff23
+#define   ADIN1300_GE_RGMII_RXID_EN		BIT(2)
+#define   ADIN1300_GE_RGMII_TXID_EN		BIT(1)
+#define   ADIN1300_GE_RGMII_EN			BIT(0)
+
+#define ADIN1300_GE_RMII_CFG_REG		0xff24
+#define   ADIN1300_GE_RMII_EN			BIT(0)
+
+static int adin_config_rgmii_mode(struct phy_device *phydev)
+{
+	int reg;
+
+	if (!phy_interface_is_rgmii(phydev))
+		return phy_clear_bits_mmd(phydev, MDIO_MMD_VEND1,
+					  ADIN1300_GE_RGMII_CFG_REG,
+					  ADIN1300_GE_RGMII_EN);
+
+	reg = phy_read_mmd(phydev, MDIO_MMD_VEND1, ADIN1300_GE_RGMII_CFG_REG);
+	if (reg < 0)
+		return reg;
+
+	reg |= ADIN1300_GE_RGMII_EN;
+
+	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
+	    phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID) {
+		reg |= ADIN1300_GE_RGMII_RXID_EN;
+	} else {
+		reg &= ~ADIN1300_GE_RGMII_RXID_EN;
+	}
+
+	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
+	    phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID) {
+		reg |= ADIN1300_GE_RGMII_TXID_EN;
+	} else {
+		reg &= ~ADIN1300_GE_RGMII_TXID_EN;
+	}
+
+	return phy_write_mmd(phydev, MDIO_MMD_VEND1,
+			     ADIN1300_GE_RGMII_CFG_REG, reg);
+}
+
+static int adin_config_rmii_mode(struct phy_device *phydev)
+{
+	int reg;
+
+	if (phydev->interface != PHY_INTERFACE_MODE_RMII)
+		return phy_clear_bits_mmd(phydev, MDIO_MMD_VEND1,
+					  ADIN1300_GE_RMII_CFG_REG,
+					  ADIN1300_GE_RMII_EN);
+
+	reg = phy_read_mmd(phydev, MDIO_MMD_VEND1, ADIN1300_GE_RMII_CFG_REG);
+	if (reg < 0)
+		return reg;
+
+	reg |= ADIN1300_GE_RMII_EN;
+
+	return phy_write_mmd(phydev, MDIO_MMD_VEND1,
+			     ADIN1300_GE_RMII_CFG_REG, reg);
+}
+
 static int adin_config_init(struct phy_device *phydev)
 {
-	return genphy_config_init(phydev);
+	int rc;
+
+	rc = genphy_config_init(phydev);
+	if (rc < 0)
+		return rc;
+
+	rc = adin_config_rgmii_mode(phydev);
+	if (rc < 0)
+		return rc;
+
+	rc = adin_config_rmii_mode(phydev);
+	if (rc < 0)
+		return rc;
+
+	phydev_dbg(phydev, "PHY is using mode '%s'\n",
+		   phy_modes(phydev->interface));
+
+	return 0;
 }
 
 static int adin_phy_ack_intr(struct phy_device *phydev)
-- 
2.20.1

[PATCH v2 07/15] net: phy: adin: make RGMII internal delays configurable

[Alexandru Ardelean]

The internal delays for the RGMII are configurable for both RX & TX. This
change adds support for configuring them via device-tree (or ACPI).

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/net/phy/adin.c | 82 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)

diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
index 9169d6c08383..62c1268e55f7 100644
--- a/drivers/net/phy/adin.c
+++ b/drivers/net/phy/adin.c
@@ -5,11 +5,13 @@
  * Copyright 2019 Analog Devices Inc.
  */
 #include <linux/kernel.h>
+#include <linux/bitfield.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/mii.h>
 #include <linux/phy.h>
+#include <linux/property.h>
 
 #define PHY_ID_ADIN1200				0x0283bc20
 #define PHY_ID_ADIN1300				0x0283bc30
@@ -34,15 +36,83 @@
 #define ADIN1300_INT_STATUS_REG			0x0019
 
 #define ADIN1300_GE_RGMII_CFG_REG		0xff23
+#define   ADIN1300_GE_RGMII_RX_MSK		GENMASK(8, 6)
+#define   ADIN1300_GE_RGMII_RX_SEL(x)		\
+		FIELD_PREP(ADIN1300_GE_RGMII_RX_MSK, x)
+#define   ADIN1300_GE_RGMII_GTX_MSK		GENMASK(5, 3)
+#define   ADIN1300_GE_RGMII_GTX_SEL(x)		\
+		FIELD_PREP(ADIN1300_GE_RGMII_GTX_MSK, x)
 #define   ADIN1300_GE_RGMII_RXID_EN		BIT(2)
 #define   ADIN1300_GE_RGMII_TXID_EN		BIT(1)
 #define   ADIN1300_GE_RGMII_EN			BIT(0)
 
+/* RGMII internal delay settings for rx and tx for ADIN1300 */
+#define ADIN1300_RGMII_1_60_NS			0x0001
+#define ADIN1300_RGMII_1_80_NS			0x0002
+#define	ADIN1300_RGMII_2_00_NS			0x0000
+#define	ADIN1300_RGMII_2_20_NS			0x0006
+#define	ADIN1300_RGMII_2_40_NS			0x0007
+
 #define ADIN1300_GE_RMII_CFG_REG		0xff24
 #define   ADIN1300_GE_RMII_EN			BIT(0)
 
+/**
+ * struct adin_cfg_reg_map - map a config value to aregister value
+ * @cfg		value in device configuration
+ * @reg		value in the register
+ */
+struct adin_cfg_reg_map {
+	int cfg;
+	int reg;
+};
+
+static const struct adin_cfg_reg_map adin_rgmii_delays[] = {
+	{ 1600, ADIN1300_RGMII_1_60_NS },
+	{ 1800, ADIN1300_RGMII_1_80_NS },
+	{ 2000, ADIN1300_RGMII_2_00_NS },
+	{ 2200, ADIN1300_RGMII_2_20_NS },
+	{ 2400, ADIN1300_RGMII_2_40_NS },
+	{ },
+};
+
+static int adin_lookup_reg_value(const struct adin_cfg_reg_map *tbl, int cfg)
+{
+	size_t i;
+
+	for (i = 0; tbl[i].cfg; i++) {
+		if (tbl[i].cfg == cfg)
+			return tbl[i].reg;
+	}
+
+	return -EINVAL;
+}
+
+static u32 adin_get_reg_value(struct phy_device *phydev,
+			      const char *prop_name,
+			      const struct adin_cfg_reg_map *tbl,
+			      u32 dflt)
+{
+	struct device *dev = &phydev->mdio.dev;
+	u32 val;
+	int rc;
+
+	if (device_property_read_u32(dev, prop_name, &val))
+		return dflt;
+
+	rc = adin_lookup_reg_value(tbl, val);
+	if (rc < 0) {
+		phydev_warn(phydev,
+			    "Unsupported value %u for %s using default (%u)\n",
+			    val, prop_name, dflt);
+		return dflt;
+	}
+
+	return rc;
+}
+
 static int adin_config_rgmii_mode(struct phy_device *phydev)
 {
+	u32 val;
 	int reg;
 
 	if (!phy_interface_is_rgmii(phydev))
@@ -59,6 +129,12 @@ static int adin_config_rgmii_mode(struct phy_device *phydev)
 	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
 	    phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID) {
 		reg |= ADIN1300_GE_RGMII_RXID_EN;
+
+		val = adin_get_reg_value(phydev, "adi,rx-internal-delay-ps",
+					 adin_rgmii_delays,
+					 ADIN1300_RGMII_2_00_NS);
+		reg &= ~ADIN1300_GE_RGMII_RX_MSK;
+		reg |= ADIN1300_GE_RGMII_RX_SEL(val);
 	} else {
 		reg &= ~ADIN1300_GE_RGMII_RXID_EN;
 	}
@@ -66,6 +142,12 @@ static int adin_config_rgmii_mode(struct phy_device *phydev)
 	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
 	    phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID) {
 		reg |= ADIN1300_GE_RGMII_TXID_EN;
+
+		val = adin_get_reg_value(phydev, "adi,tx-internal-delay-ps",
+					 adin_rgmii_delays,
+					 ADIN1300_RGMII_2_00_NS);
+		reg &= ~ADIN1300_GE_RGMII_GTX_MSK;
+		reg |= ADIN1300_GE_RGMII_GTX_SEL(val);
 	} else {
 		reg &= ~ADIN1300_GE_RGMII_TXID_EN;
 	}
-- 
2.20.1

[PATCH v2 08/15] net: phy: adin: make RMII fifo depth configurable

[Alexandru Ardelean]

The FIFO depth can be configured for the RMII mode. This change adds
support for doing this via device-tree (or ACPI).

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/net/phy/adin.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
index 62c1268e55f7..26b2f2b21596 100644
--- a/drivers/net/phy/adin.c
+++ b/drivers/net/phy/adin.c
@@ -54,8 +54,19 @@
 #define	ADIN1300_RGMII_2_40_NS			0x0007
 
 #define ADIN1300_GE_RMII_CFG_REG		0xff24
+#define   ADIN1300_GE_RMII_FIFO_DEPTH_MSK	GENMASK(6, 4)
+#define   ADIN1300_GE_RMII_FIFO_DEPTH_SEL(x)	\
+		FIELD_PREP(ADIN1300_GE_RMII_FIFO_DEPTH_MSK, x)
 #define   ADIN1300_GE_RMII_EN			BIT(0)
 
+/* RMII fifo depth values */
+#define ADIN1300_RMII_4_BITS			0x0000
+#define ADIN1300_RMII_8_BITS			0x0001
+#define ADIN1300_RMII_12_BITS			0x0002
+#define ADIN1300_RMII_16_BITS			0x0003
+#define ADIN1300_RMII_20_BITS			0x0004
+#define ADIN1300_RMII_24_BITS			0x0005
+
 /**
  * struct adin_cfg_reg_map - map a config value to aregister value
  * @cfg		value in device configuration
@@ -75,6 +86,16 @@ static const struct adin_cfg_reg_map adin_rgmii_delays[] = {
 	{ },
 };
 
+static const struct adin_cfg_reg_map adin_rmii_fifo_depths[] = {
+	{ 4,  ADIN1300_RMII_4_BITS },
+	{ 8,  ADIN1300_RMII_8_BITS },
+	{ 12, ADIN1300_RMII_12_BITS },
+	{ 16, ADIN1300_RMII_16_BITS },
+	{ 20, ADIN1300_RMII_20_BITS },
+	{ 24, ADIN1300_RMII_24_BITS },
+	{ },
+};
+
 static int adin_lookup_reg_value(const struct adin_cfg_reg_map *tbl, int cfg)
 {
 	size_t i;
@@ -158,6 +179,7 @@ static int adin_config_rgmii_mode(struct phy_device *phydev)
 
 static int adin_config_rmii_mode(struct phy_device *phydev)
 {
+	u32 val;
 	int reg;
 
 	if (phydev->interface != PHY_INTERFACE_MODE_RMII)
@@ -171,6 +193,13 @@ static int adin_config_rmii_mode(struct phy_device *phydev)
 
 	reg |= ADIN1300_GE_RMII_EN;
 
+	val = adin_get_reg_value(phydev, "adi,fifo-depth-bits",
+				 adin_rmii_fifo_depths,
+				 ADIN1300_RMII_8_BITS);
+
+	reg &= ~ADIN1300_GE_RMII_FIFO_DEPTH_MSK;
+	reg |= ADIN1300_GE_RMII_FIFO_DEPTH_SEL(val);
+
 	return phy_write_mmd(phydev, MDIO_MMD_VEND1,
 			     ADIN1300_GE_RMII_CFG_REG, reg);
 }
-- 
2.20.1

[PATCH v2 09/15] net: phy: adin: add support MDI/MDIX/Auto-MDI selection

[Alexandru Ardelean]

The ADIN PHYs support automatic MDI/MDIX negotiation. By default this is
disabled, so this is enabled at `config_init`.

This is controlled via the PHY Control 1 register.
The supported modes are:
  1. Manual MDI
  2. Manual MDIX
  3. Auto MDIX - prefer MDIX
  4. Auto MDIX - prefer MDI

The phydev mdix & mdix_ctrl fields include modes 3 & 4 into a single
auto-mode. So, the default mode this driver enables is 4 when Auto-MDI mode
is used.

When detecting MDI/MDIX mode, a combination of the PHY Control 1 register
and PHY Status 1 register is used to determine the correct MDI/MDIX mode.

If Auto-MDI mode is not set, then the manual MDI/MDIX mode is returned.
If Auto-MDI mode is set, then MDIX mode is returned differs from the
preferred MDI/MDIX mode.
This covers all cases where:
  1. MDI preferred  & Pair01Swapped   == MDIX
  2. MDIX preferred & Pair01Swapped   == MDI
  3. MDI preferred  & ! Pair01Swapped == MDIX
  4. MDIX preferred & ! Pair01Swapped == MDI

The preferred MDI/MDIX mode is not configured via SW, but can be configured
via HW pins. Note that the `Pair01Swapped` is the Green-Yellow physical
pairs.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/net/phy/adin.c | 117 +++++++++++++++++++++++++++++++++++++++--
 1 file changed, 113 insertions(+), 4 deletions(-)

diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
index 26b2f2b21596..69ef53bbecc3 100644
--- a/drivers/net/phy/adin.c
+++ b/drivers/net/phy/adin.c
@@ -19,6 +19,10 @@
 #define ADIN1300_MII_EXT_REG_PTR		0x0010
 #define ADIN1300_MII_EXT_REG_DATA		0x0011
 
+#define ADIN1300_PHY_CTRL1			0x0012
+#define   ADIN1300_AUTO_MDI_EN			BIT(10)
+#define   ADIN1300_MAN_MDIX_EN			BIT(9)
+
 #define ADIN1300_INT_MASK_REG			0x0018
 #define   ADIN1300_INT_MDIO_SYNC_EN		BIT(9)
 #define   ADIN1300_INT_ANEG_STAT_CHNG_EN	BIT(8)
@@ -35,6 +39,9 @@
 	 ADIN1300_INT_HW_IRQ_EN)
 #define ADIN1300_INT_STATUS_REG			0x0019
 
+#define ADIN1300_PHY_STATUS1			0x001a
+#define   ADIN1300_PAIR_01_SWAP			BIT(11)
+
 #define ADIN1300_GE_RGMII_CFG_REG		0xff23
 #define   ADIN1300_GE_RGMII_RX_MSK		GENMASK(8, 6)
 #define   ADIN1300_GE_RGMII_RX_SEL(x)		\
@@ -208,6 +215,8 @@ static int adin_config_init(struct phy_device *phydev)
 {
 	int rc;
 
+	phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
+
 	rc = genphy_config_init(phydev);
 	if (rc < 0)
 		return rc;
@@ -283,13 +292,113 @@ static int adin_write_mmd(struct phy_device *phydev, int devad, u16 regnum,
 	return __mdiobus_write(bus, phy_addr, ADIN1300_MII_EXT_REG_DATA, val);
 }
 
+static int adin_config_mdix(struct phy_device *phydev)
+{
+	bool auto_en, mdix_en;
+	int reg;
+
+	mdix_en = false;
+	auto_en = false;
+	switch (phydev->mdix_ctrl) {
+	case ETH_TP_MDI:
+		break;
+	case ETH_TP_MDI_X:
+		mdix_en = true;
+		break;
+	case ETH_TP_MDI_AUTO:
+		auto_en = true;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	reg = phy_read(phydev, ADIN1300_PHY_CTRL1);
+	if (reg < 0)
+		return reg;
+
+	if (mdix_en)
+		reg |= ADIN1300_MAN_MDIX_EN;
+	else
+		reg &= ~ADIN1300_MAN_MDIX_EN;
+
+	if (auto_en)
+		reg |= ADIN1300_AUTO_MDI_EN;
+	else
+		reg &= ~ADIN1300_AUTO_MDI_EN;
+
+	return phy_write(phydev, ADIN1300_PHY_CTRL1, reg);
+}
+
+static int adin_config_aneg(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = adin_config_mdix(phydev);
+	if (ret)
+		return ret;
+
+	return genphy_config_aneg(phydev);
+}
+
+static int adin_mdix_update(struct phy_device *phydev)
+{
+	bool auto_en, mdix_en;
+	bool swapped;
+	int reg;
+
+	reg = phy_read(phydev, ADIN1300_PHY_CTRL1);
+	if (reg < 0)
+		return reg;
+
+	auto_en = !!(reg & ADIN1300_AUTO_MDI_EN);
+	mdix_en = !!(reg & ADIN1300_MAN_MDIX_EN);
+
+	/* If MDI/MDIX is forced, just read it from the control reg */
+	if (!auto_en) {
+		if (mdix_en)
+			phydev->mdix = ETH_TP_MDI_X;
+		else
+			phydev->mdix = ETH_TP_MDI;
+		return 0;
+	}
+
+	/**
+	 * Otherwise, we need to deduce it from the PHY status2 reg.
+	 * When Auto-MDI is enabled, the ADIN1300_MAN_MDIX_EN bit implies
+	 * a preference for MDIX when it is set.
+	 */
+	reg = phy_read(phydev, ADIN1300_PHY_STATUS1);
+	if (reg < 0)
+		return reg;
+
+	swapped = !!(reg & ADIN1300_PAIR_01_SWAP);
+
+	if (mdix_en != swapped)
+		phydev->mdix = ETH_TP_MDI_X;
+	else
+		phydev->mdix = ETH_TP_MDI;
+
+	return 0;
+}
+
+static int adin_read_status(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = adin_mdix_update(phydev);
+	if (ret < 0)
+		return ret;
+
+	return genphy_read_status(phydev);
+}
+
 static struct phy_driver adin_driver[] = {
 	{
 		PHY_ID_MATCH_MODEL(PHY_ID_ADIN1200),
 		.name		= "ADIN1200",
 		.config_init	= adin_config_init,
-		.config_aneg	= genphy_config_aneg,
-		.read_status	= genphy_read_status,
+		.config_aneg	= adin_config_aneg,
+		.read_status	= adin_read_status,
 		.get_features	= genphy_read_abilities,
 		.ack_interrupt	= adin_phy_ack_intr,
 		.config_intr	= adin_phy_config_intr,
@@ -302,8 +411,8 @@ static struct phy_driver adin_driver[] = {
 		PHY_ID_MATCH_MODEL(PHY_ID_ADIN1300),
 		.name		= "ADIN1300",
 		.config_init	= adin_config_init,
-		.config_aneg	= genphy_config_aneg,
-		.read_status	= genphy_read_status,
+		.config_aneg	= adin_config_aneg,
+		.read_status	= adin_read_status,
 		.get_features	= genphy_read_abilities,
 		.ack_interrupt	= adin_phy_ack_intr,
 		.config_intr	= adin_phy_config_intr,
-- 
2.20.1

[PATCH v2 10/15] net: phy: adin: add EEE translation layer from Clause 45 to Clause 22

[Alexandru Ardelean]

The ADIN1200 & ADIN1300 PHYs support EEE by using standard Clause 45 access
to access MMD registers for EEE.

The EEE register addresses (when using Clause 22) are available at
different addresses (than Clause 45), and since accessing these regs (via
Clause 22) needs a special mechanism, a translation table is required to
convert these addresses.

For Clause 45, this is not needed; the addresses are available as specified
by IEEE.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/net/phy/adin.c | 69 ++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 67 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
index 69ef53bbecc3..c1cea1b6bd75 100644
--- a/drivers/net/phy/adin.c
+++ b/drivers/net/phy/adin.c
@@ -42,6 +42,17 @@
 #define ADIN1300_PHY_STATUS1			0x001a
 #define   ADIN1300_PAIR_01_SWAP			BIT(11)
 
+/* EEE register addresses, accessible via Clause 22 access using
+ * ADIN1300_MII_EXT_REG_PTR & ADIN1300_MII_EXT_REG_DATA.
+ * The bit-fields are the same as specified by IEEE, and can be
+ * accessed via standard Clause 45 access.
+ */
+#define ADIN1300_EEE_CAP_REG			0x8000
+#define ADIN1300_EEE_ADV_REG			0x8001
+#define ADIN1300_EEE_LPABLE_REG			0x8002
+#define ADIN1300_CLOCK_STOP_REG			0x9400
+#define ADIN1300_LPI_WAKE_ERR_CNT_REG		0xa000
+
 #define ADIN1300_GE_RGMII_CFG_REG		0xff23
 #define   ADIN1300_GE_RGMII_RX_MSK		GENMASK(8, 6)
 #define   ADIN1300_GE_RGMII_RX_SEL(x)		\
@@ -103,6 +114,26 @@ static const struct adin_cfg_reg_map adin_rmii_fifo_depths[] = {
 	{ },
 };
 
+/**
+ * struct adin_clause45_mmd_map - map to convert Clause 45 regs to Clause 22
+ * @devad		device address used in Clause 45 access
+ * @cl45_regnum		register address defined by Clause 45
+ * @adin_regnum		equivalent register address accessible via Clause 22
+ */
+struct adin_clause45_mmd_map {
+	int devad;
+	u16 cl45_regnum;
+	u16 adin_regnum;
+};
+
+static struct adin_clause45_mmd_map adin_clause45_mmd_map[] = {
+	{ MDIO_MMD_PCS,	MDIO_PCS_EEE_ABLE,	ADIN1300_EEE_CAP_REG },
+	{ MDIO_MMD_AN,	MDIO_AN_EEE_LPABLE,	ADIN1300_EEE_LPABLE_REG },
+	{ MDIO_MMD_AN,	MDIO_AN_EEE_ADV,	ADIN1300_EEE_ADV_REG },
+	{ MDIO_MMD_PCS,	MDIO_CTRL1,		ADIN1300_CLOCK_STOP_REG },
+	{ MDIO_MMD_PCS, MDIO_PCS_EEE_WK_ERR,	ADIN1300_LPI_WAKE_ERR_CNT_REG },
+};
+
 static int adin_lookup_reg_value(const struct adin_cfg_reg_map *tbl, int cfg)
 {
 	size_t i;
@@ -253,10 +284,33 @@ static int adin_phy_config_intr(struct phy_device *phydev)
 			      ADIN1300_INT_MASK_EN);
 }
 
+static int adin_cl45_to_adin_reg(struct phy_device *phydev, int devad,
+				 u16 cl45_regnum)
+{
+	struct adin_clause45_mmd_map *m;
+	int i;
+
+	if (devad == MDIO_MMD_VEND1)
+		return cl45_regnum;
+
+	for (i = 0; i < ARRAY_SIZE(adin_clause45_mmd_map); i++) {
+		m = &adin_clause45_mmd_map[i];
+		if (m->devad == devad && m->cl45_regnum == cl45_regnum)
+			return m->adin_regnum;
+	}
+
+	phydev_err(phydev,
+		   "No translation available for devad: %d reg: %04x\n",
+		   devad, cl45_regnum);
+
+	return -EINVAL;
+}
+
 static int adin_read_mmd(struct phy_device *phydev, int devad, u16 regnum)
 {
 	struct mii_bus *bus = phydev->mdio.bus;
 	int phy_addr = phydev->mdio.addr;
+	int adin_regnum;
 	int err;
 
 	if (phydev->is_c45) {
@@ -265,7 +319,12 @@ static int adin_read_mmd(struct phy_device *phydev, int devad, u16 regnum)
 		return __mdiobus_read(bus, phy_addr, addr);
 	}
 
-	err = __mdiobus_write(bus, phy_addr, ADIN1300_MII_EXT_REG_PTR, regnum);
+	adin_regnum = adin_cl45_to_adin_reg(phydev, devad, regnum);
+	if (adin_regnum < 0)
+		return adin_regnum;
+
+	err = __mdiobus_write(bus, phy_addr, ADIN1300_MII_EXT_REG_PTR,
+			      adin_regnum);
 	if (err)
 		return err;
 
@@ -277,6 +336,7 @@ static int adin_write_mmd(struct phy_device *phydev, int devad, u16 regnum,
 {
 	struct mii_bus *bus = phydev->mdio.bus;
 	int phy_addr = phydev->mdio.addr;
+	int adin_regnum;
 	int err;
 
 	if (phydev->is_c45) {
@@ -285,7 +345,12 @@ static int adin_write_mmd(struct phy_device *phydev, int devad, u16 regnum,
 		return __mdiobus_write(bus, phy_addr, addr, val);
 	}
 
-	err = __mdiobus_write(bus, phy_addr, ADIN1300_MII_EXT_REG_PTR, regnum);
+	adin_regnum = adin_cl45_to_adin_reg(phydev, devad, regnum);
+	if (adin_regnum < 0)
+		return adin_regnum;
+
+	err = __mdiobus_write(bus, phy_addr, ADIN1300_MII_EXT_REG_PTR,
+			      adin_regnum);
 	if (err)
 		return err;
 
-- 
2.20.1

[PATCH v2 11/15] net: phy: adin: implement PHY subsystem software reset

[Alexandru Ardelean]

The ADIN PHYs supports 4 types of reset:
1. The standard PHY reset via BMCR_RESET bit in MII_BMCR reg
2. Reset via GPIO
3. Reset via reg GeSftRst (0xff0c) & reload previous pin configs
4. Reset via reg GeSftRst (0xff0c) & request new pin configs

Resets 2 & 4 are almost identical, with the exception that the crystal
oscillator is available during reset for 2.

As it turns out, phylib already supports GPIO reset.
In case this is configured, the PHY driver won't do anything. In case it
isn't specified the subsystem software reset will kick in.

Resetting via GeSftRst or via GPIO is useful when doing a warm reboot,
because this will reset the subsystem registers to default values.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/net/phy/adin.c | 43 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
index c1cea1b6bd75..f276d692bdee 100644
--- a/drivers/net/phy/adin.c
+++ b/drivers/net/phy/adin.c
@@ -6,6 +6,7 @@
  */
 #include <linux/kernel.h>
 #include <linux/bitfield.h>
+#include <linux/delay.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/module.h>
@@ -53,6 +54,9 @@
 #define ADIN1300_CLOCK_STOP_REG			0x9400
 #define ADIN1300_LPI_WAKE_ERR_CNT_REG		0xa000
 
+#define ADIN1300_GE_SOFT_RESET_REG		0xff0c
+#define   ADIN1300_GE_SOFT_RESET		BIT(0)
+
 #define ADIN1300_GE_RGMII_CFG_REG		0xff23
 #define   ADIN1300_GE_RGMII_RX_MSK		GENMASK(8, 6)
 #define   ADIN1300_GE_RGMII_RX_SEL(x)		\
@@ -457,11 +461,49 @@ static int adin_read_status(struct phy_device *phydev)
 	return genphy_read_status(phydev);
 }
 
+static int adin_subsytem_soft_reset(struct phy_device *phydev)
+{
+	int reg, rc, i;
+
+	rc = phy_set_bits_mmd(phydev, MDIO_MMD_VEND1,
+			      ADIN1300_GE_SOFT_RESET_REG,
+			      ADIN1300_GE_SOFT_RESET);
+	if (rc < 0)
+		return rc;
+
+	for (i = 0; i < 20; i++) {
+		usleep_range(500, 1000);
+		reg = phy_read_mmd(phydev, MDIO_MMD_VEND1,
+				   ADIN1300_GE_SOFT_RESET_REG);
+		if (reg < 0 || (reg & ADIN1300_GE_SOFT_RESET))
+			continue;
+		return 0;
+	}
+
+	return -ETIMEDOUT;
+}
+
+static int adin_reset(struct phy_device *phydev)
+{
+	/* If there is a reset GPIO just exit */
+	if (!IS_ERR_OR_NULL(phydev->mdio.reset_gpio))
+		return 0;
+
+	/* Reset PHY core regs & subsystem regs */
+	return adin_subsytem_soft_reset(phydev);
+}
+
+static int adin_probe(struct phy_device *phydev)
+{
+	return adin_reset(phydev);
+}
+
 static struct phy_driver adin_driver[] = {
 	{
 		PHY_ID_MATCH_MODEL(PHY_ID_ADIN1200),
 		.name		= "ADIN1200",
 		.config_init	= adin_config_init,
+		.probe		= adin_probe,
 		.config_aneg	= adin_config_aneg,
 		.read_status	= adin_read_status,
 		.get_features	= genphy_read_abilities,
@@ -476,6 +518,7 @@ static struct phy_driver adin_driver[] = {
 		PHY_ID_MATCH_MODEL(PHY_ID_ADIN1300),
 		.name		= "ADIN1300",
 		.config_init	= adin_config_init,
+		.probe		= adin_probe,
 		.config_aneg	= adin_config_aneg,
 		.read_status	= adin_read_status,
 		.get_features	= genphy_read_abilities,
-- 
2.20.1

[PATCH v2 12/15] net: phy: adin: implement Energy Detect Powerdown mode

[Alexandru Ardelean]

The ADIN PHYs support Energy Detect Powerdown mode, which puts the PHY into
a low power mode when there is no signal on the wire (typically cable
unplugged).
This behavior is enabled by default, but can be disabled via device
property.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/net/phy/adin.c | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
index f276d692bdee..bc4393195de7 100644
--- a/drivers/net/phy/adin.c
+++ b/drivers/net/phy/adin.c
@@ -24,6 +24,11 @@
 #define   ADIN1300_AUTO_MDI_EN			BIT(10)
 #define   ADIN1300_MAN_MDIX_EN			BIT(9)
 
+#define ADIN1300_PHY_CTRL_STATUS2		0x0015
+#define   ADIN1300_NRG_PD_EN			BIT(3)
+#define   ADIN1300_NRG_PD_TX_EN			BIT(2)
+#define   ADIN1300_NRG_PD_STATUS		BIT(1)
+
 #define ADIN1300_INT_MASK_REG			0x0018
 #define   ADIN1300_INT_MDIO_SYNC_EN		BIT(9)
 #define   ADIN1300_INT_ANEG_STAT_CHNG_EN	BIT(8)
@@ -138,6 +143,14 @@ static struct adin_clause45_mmd_map adin_clause45_mmd_map[] = {
 	{ MDIO_MMD_PCS, MDIO_PCS_EEE_WK_ERR,	ADIN1300_LPI_WAKE_ERR_CNT_REG },
 };
 
+/**
+ * struct adin_priv - ADIN PHY driver private data
+ * edpd_enabled		true if Energy Detect Powerdown mode is enabled
+ */
+struct adin_priv {
+	bool			edpd_enabled;
+};
+
 static int adin_lookup_reg_value(const struct adin_cfg_reg_map *tbl, int cfg)
 {
 	size_t i;
@@ -246,6 +259,18 @@ static int adin_config_rmii_mode(struct phy_device *phydev)
 			     ADIN1300_GE_RMII_CFG_REG, reg);
 }
 
+static int adin_config_init_edpd(struct phy_device *phydev)
+{
+	struct adin_priv *priv = phydev->priv;
+
+	if (priv->edpd_enabled)
+		return phy_set_bits(phydev, ADIN1300_PHY_CTRL_STATUS2,
+				(ADIN1300_NRG_PD_EN | ADIN1300_NRG_PD_TX_EN));
+
+	return phy_clear_bits(phydev, ADIN1300_PHY_CTRL_STATUS2,
+			(ADIN1300_NRG_PD_EN | ADIN1300_NRG_PD_TX_EN));
+}
+
 static int adin_config_init(struct phy_device *phydev)
 {
 	int rc;
@@ -264,6 +289,10 @@ static int adin_config_init(struct phy_device *phydev)
 	if (rc < 0)
 		return rc;
 
+	rc = adin_config_init_edpd(phydev);
+	if (rc < 0)
+		return rc;
+
 	phydev_dbg(phydev, "PHY is using mode '%s'\n",
 		   phy_modes(phydev->interface));
 
@@ -495,6 +524,17 @@ static int adin_reset(struct phy_device *phydev)
 
 static int adin_probe(struct phy_device *phydev)
 {
+	struct device *dev = &phydev->mdio.dev;
+	struct adin_priv *priv;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->edpd_enabled =
+		device_property_read_bool(dev, "adi,disable-energy-detect");
+	phydev->priv = priv;
+
 	return adin_reset(phydev);
 }
 
-- 
2.20.1

[PATCH v2 13/15] net: phy: adin: configure downshift on config_init

[Alexandru Ardelean]

Down-speed auto-negotiation may not always be enabled, in which case the
PHY won't down-shift to 100 or 10 during auto-negotiation.

This change enables downshift and configures the number of retries to
default 8 (maximum supported value).

The change has been adapted from the Marvell PHY driver.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/net/phy/adin.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
index bc4393195de7..d6d1f5037eb7 100644
--- a/drivers/net/phy/adin.c
+++ b/drivers/net/phy/adin.c
@@ -29,6 +29,18 @@
 #define   ADIN1300_NRG_PD_TX_EN			BIT(2)
 #define   ADIN1300_NRG_PD_STATUS		BIT(1)
 
+#define ADIN1300_PHY_CTRL2			0x0016
+#define   ADIN1300_DOWNSPEED_AN_100_EN		BIT(11)
+#define   ADIN1300_DOWNSPEED_AN_10_EN		BIT(10)
+#define   ADIN1300_GROUP_MDIO_EN		BIT(6)
+#define   ADIN1300_DOWNSPEEDS_EN	\
+	(ADIN1300_DOWNSPEED_AN_100_EN | ADIN1300_DOWNSPEED_AN_10_EN)
+
+#define ADIN1300_PHY_CTRL3			0x0017
+#define   ADIN1300_LINKING_EN			BIT(13)
+#define   ADIN1300_DOWNSPEED_RETRIES_MSK	GENMASK(12, 10)
+#define   ADIN1300_DOWNSPEED_RETRIES_OFF	10
+
 #define ADIN1300_INT_MASK_REG			0x0018
 #define   ADIN1300_INT_MDIO_SYNC_EN		BIT(9)
 #define   ADIN1300_INT_ANEG_STAT_CHNG_EN	BIT(8)
@@ -259,6 +271,29 @@ static int adin_config_rmii_mode(struct phy_device *phydev)
 			     ADIN1300_GE_RMII_CFG_REG, reg);
 }
 
+static int adin_config_down_shift(struct phy_device *phydev, bool enable,
+				  u8 retries)
+{
+	u16 mask, set;
+	int rc;
+
+	if (!enable)
+		return phy_clear_bits(phydev, ADIN1300_PHY_CTRL2,
+				      ADIN1300_DOWNSPEEDS_EN);
+
+	mask = ADIN1300_LINKING_EN | ADIN1300_DOWNSPEED_RETRIES_MSK;
+	set = (retries << ADIN1300_DOWNSPEED_RETRIES_OFF);
+	set &= ADIN1300_DOWNSPEED_RETRIES_MSK;
+	set |= ADIN1300_LINKING_EN;
+
+	rc = phy_modify_changed(phydev, ADIN1300_PHY_CTRL3, mask, set);
+	if (rc < 0)
+		return rc;
+
+	return phy_set_bits(phydev, ADIN1300_PHY_CTRL2,
+			    ADIN1300_DOWNSPEEDS_EN);
+}
+
 static int adin_config_init_edpd(struct phy_device *phydev)
 {
 	struct adin_priv *priv = phydev->priv;
@@ -289,6 +324,10 @@ static int adin_config_init(struct phy_device *phydev)
 	if (rc < 0)
 		return rc;
 
+	rc = adin_config_down_shift(phydev, true, 8);
+	if (rc < 0)
+		return rc;
+
 	rc = adin_config_init_edpd(phydev);
 	if (rc < 0)
 		return rc;
-- 
2.20.1

[PATCH v2 14/15] net: phy: adin: add ethtool get_stats support

[Alexandru Ardelean]

This change implements retrieving all the error counters from the PHY.
The PHY supports several error counters/stats. The `Mean Square Errors`
status values are only valie when a link is established, and shouldn't be
accumulated. These values characterize the quality of a signal.

The rest of the error counters are self-clearing on read.
Most of them are reports from the Frame Checker engine that the PHY has.

Not retrieving the `LPI Wake Error Count Register` here, since that is used
by the PHY framework to check for any EEE errors. And that register is
self-clearing when read (as per IEEE spec).

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/net/phy/adin.c | 109 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)

diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
index d6d1f5037eb7..d170d1e837b5 100644
--- a/drivers/net/phy/adin.c
+++ b/drivers/net/phy/adin.c
@@ -155,12 +155,40 @@ static struct adin_clause45_mmd_map adin_clause45_mmd_map[] = {
 	{ MDIO_MMD_PCS, MDIO_PCS_EEE_WK_ERR,	ADIN1300_LPI_WAKE_ERR_CNT_REG },
 };
 
+struct adin_hw_stat {
+	const char *string;
+	u16 reg1;
+	u16 reg2;
+	bool do_not_accumulate;
+};
+
+/* Named just like in the datasheet */
+static struct adin_hw_stat adin_hw_stats[] = {
+	{ "RxErrCnt",		0x0014,	},
+	{ "MseA",		0x8402,	0,	true },
+	{ "MseB",		0x8403,	0,	true },
+	{ "MseC",		0x8404,	0,	true },
+	{ "MseD",		0x8405,	0,	true },
+	{ "FcFrmCnt",		0x940A, 0x940B }, /* FcFrmCntH + FcFrmCntL */
+	{ "FcLenErrCnt",	0x940C },
+	{ "FcAlgnErrCnt",	0x940D },
+	{ "FcSymbErrCnt",	0x940E },
+	{ "FcOszCnt",		0x940F },
+	{ "FcUszCnt",		0x9410 },
+	{ "FcOddCnt",		0x9411 },
+	{ "FcOddPreCnt",	0x9412 },
+	{ "FcDribbleBitsCnt",	0x9413 },
+	{ "FcFalseCarrierCnt",	0x9414 },
+};
+
 /**
  * struct adin_priv - ADIN PHY driver private data
  * edpd_enabled		true if Energy Detect Powerdown mode is enabled
+ * stats		statistic counters for the PHY
  */
 struct adin_priv {
 	bool			edpd_enabled;
+	u64			stats[ARRAY_SIZE(adin_hw_stats)];
 };
 
 static int adin_lookup_reg_value(const struct adin_cfg_reg_map *tbl, int cfg)
@@ -561,6 +589,81 @@ static int adin_reset(struct phy_device *phydev)
 	return adin_subsytem_soft_reset(phydev);
 }
 
+static int adin_get_sset_count(struct phy_device *phydev)
+{
+	return ARRAY_SIZE(adin_hw_stats);
+}
+
+static void adin_get_strings(struct phy_device *phydev, u8 *data)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(adin_hw_stats); i++) {
+		strlcpy(&data[i * ETH_GSTRING_LEN],
+			adin_hw_stats[i].string, ETH_GSTRING_LEN);
+	}
+}
+
+static int adin_read_mmd_stat_regs(struct phy_device *phydev,
+				   struct adin_hw_stat *stat,
+				   u32 *val)
+{
+	int ret;
+
+	ret = phy_read_mmd(phydev, MDIO_MMD_VEND1, stat->reg1);
+	if (ret < 0)
+		return ret;
+
+	*val = (ret & 0xffff);
+
+	if (stat->reg2 == 0)
+		return 0;
+
+	ret = phy_read_mmd(phydev, MDIO_MMD_VEND1, stat->reg2);
+	if (ret < 0)
+		return ret;
+
+	*val <<= 16;
+	*val |= (ret & 0xffff);
+
+	return 0;
+}
+
+static u64 adin_get_stat(struct phy_device *phydev, int i)
+{
+	struct adin_hw_stat *stat = &adin_hw_stats[i];
+	struct adin_priv *priv = phydev->priv;
+	u32 val;
+	int ret;
+
+	if (stat->reg1 > 0x1f) {
+		ret = adin_read_mmd_stat_regs(phydev, stat, &val);
+		if (ret < 0)
+			return (u64)(~0);
+	} else {
+		ret = phy_read(phydev, stat->reg1);
+		if (ret < 0)
+			return (u64)(~0);
+		val = (ret & 0xffff);
+	}
+
+	if (stat->do_not_accumulate)
+		priv->stats[i] = val;
+	else
+		priv->stats[i] += val;
+
+	return priv->stats[i];
+}
+
+static void adin_get_stats(struct phy_device *phydev,
+			   struct ethtool_stats *stats, u64 *data)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(adin_hw_stats); i++)
+		data[i] = adin_get_stat(phydev, i);
+}
+
 static int adin_probe(struct phy_device *phydev)
 {
 	struct device *dev = &phydev->mdio.dev;
@@ -588,6 +691,9 @@ static struct phy_driver adin_driver[] = {
 		.get_features	= genphy_read_abilities,
 		.ack_interrupt	= adin_phy_ack_intr,
 		.config_intr	= adin_phy_config_intr,
+		.get_sset_count	= adin_get_sset_count,
+		.get_strings	= adin_get_strings,
+		.get_stats	= adin_get_stats,
 		.resume		= genphy_resume,
 		.suspend	= genphy_suspend,
 		.read_mmd	= adin_read_mmd,
@@ -603,6 +709,9 @@ static struct phy_driver adin_driver[] = {
 		.get_features	= genphy_read_abilities,
 		.ack_interrupt	= adin_phy_ack_intr,
 		.config_intr	= adin_phy_config_intr,
+		.get_sset_count	= adin_get_sset_count,
+		.get_strings	= adin_get_strings,
+		.get_stats	= adin_get_stats,
 		.resume		= genphy_resume,
 		.suspend	= genphy_suspend,
 		.read_mmd	= adin_read_mmd,
-- 
2.20.1

[PATCH v2 15/15] dt-bindings: net: add bindings for ADIN PHY driver

[Alexandru Ardelean]

This change adds bindings for the Analog Devices ADIN PHY driver, detailing
all the properties implemented by the driver.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 .../devicetree/bindings/net/adi,adin.yaml     | 76 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 2 files changed, 77 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/adi,adin.yaml

diff --git a/Documentation/devicetree/bindings/net/adi,adin.yaml b/Documentation/devicetree/bindings/net/adi,adin.yaml
new file mode 100644
index 000000000000..86177c8fe23a
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/adi,adin.yaml
@@ -0,0 +1,76 @@
+# SPDX-License-Identifier: GPL-2.0+
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/adi,adin.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices ADIN1200/ADIN1300 PHY
+
+maintainers:
+  - Alexandru Ardelean <alexandru.ardelean@analog.com>
+
+description: |
+  Bindings for Analog Devices Industrial Ethernet PHYs
+
+allOf:
+  - $ref: ethernet-phy.yaml#
+
+properties:
+  adi,rx-internal-delay-ps:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      RGMII RX Clock Delay used only when PHY operates in RGMII mode with
+      internal delay (phy-mode is 'rgmii-id' or 'rgmii-rxid') in pico-seconds.
+    enum: [ 1600, 1800, 2000, 2200, 2400 ]
+    default: 2000
+
+  adi,tx-internal-delay-ps:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      RGMII TX Clock Delay used only when PHY operates in RGMII mode with
+      internal delay (phy-mode is 'rgmii-id' or 'rgmii-txid') in pico-seconds.
+    enum: [ 1600, 1800, 2000, 2200, 2400 ]
+    default: 2000
+
+  adi,fifo-depth-bits:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      When operating in RMII mode, this option configures the FIFO depth.
+    enum: [ 4, 8, 12, 16, 20, 24 ]
+    default: 8
+
+  adi,disable-energy-detect:
+    description: |
+      Disables Energy Detect Powerdown Mode (default disabled, i.e energy detect
+      is enabled if this property is unspecified)
+    type: boolean
+
+examples:
+  - |
+    ethernet {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        phy-mode = "rgmii-id";
+
+        ethernet-phy@0 {
+            reg = <0>;
+
+            adi,rx-internal-delay-ps = <1800>;
+            adi,tx-internal-delay-ps = <2200>;
+        };
+    };
+  - |
+    ethernet {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        phy-mode = "rmii";
+
+        ethernet-phy@1 {
+            reg = <1>;
+
+            adi,fifo-depth-bits = <16>;
+            adi,disable-energy-detect;
+        };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index e8aa8a667864..fd9ab61c2670 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -944,6 +944,7 @@ L:	netdev@vger.kernel.org
 W:	http://ez.analog.com/community/linux-device-drivers
 S:	Supported
 F:	drivers/net/phy/adin.c
+F:	Documentation/devicetree/bindings/net/adi,adin.yaml
 
 ANALOG DEVICES INC ADIS DRIVER LIBRARY
 M:	Alexandru Ardelean <alexandru.ardelean@analog.com>
-- 
2.20.1

Re: [PATCH v2 01/15] net: phy: adin: add support for Analog Devices PHYs

[Andrew Lunn]

On Thu, Aug 08, 2019 at 03:30:12PM +0300, Alexandru Ardelean wrote:
> This change adds support for Analog Devices Industrial Ethernet PHYs.
> Particularly the PHYs this driver adds support for:
>  * ADIN1200 - Robust, Industrial, Low Power 10/100 Ethernet PHY
>  * ADIN1300 - Robust, Industrial, Low Latency 10/100/1000 Gigabit
>    Ethernet PHY
> 
> The 2 chips are pin & register compatible with one another. The main
> difference being that ADIN1200 doesn't operate in gigabit mode.
> 
> The chips can be operated by the Generic PHY driver as well via the
> standard IEEE PHY registers (0x0000 - 0x000F) which are supported by the
> kernel as well. This assumes that configuration of the PHY has been done
> completely in HW, according to spec.
> 
> Configuration can also be done via registers, which will be supported by
> this driver.
> 
> Datasheets:
>   https://www.analog.com/media/en/technical-documentation/data-sheets/ADIN1300.pdf
>   https://www.analog.com/media/en/technical-documentation/data-sheets/ADIN1200.pdf
> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

Re: [PATCH v2 02/15] net: phy: adin: hook genphy_read_abilities() to get_features

[Andrew Lunn]

On Thu, Aug 08, 2019 at 03:30:13PM +0300, Alexandru Ardelean wrote:
> The ADIN PHYs can operate with Clause 45, however they are not typical for
> how phylib considers Clause 45 PHYs.
> 
> If the `features` field & the `get_features` hook are unspecified, and the
> device wants to operate via Clause 45, it would also try to read features
> via the `genphy_c45_pma_read_abilities()`, which will try to read PMA regs
> that are unsupported.
> 
> Hooking the `genphy_read_abilities()` function to the `get_features` hook
> will ensure that this does not happen and the PHY features are read
> correctly regardless of Clause 22 or Clause 45 operation.

I think we need to stop and think about a PHY which supports both C22
and C45.

How does bus enumeration work? Is it discovered twice?  I've always
considered phydev->is_c45 means everything is c45, not that some
registers can be accessed via c45. But the driver is mixing c22 and
c45. Does the driver actually require c45? Are some features which are
only accessibly via C45? What does C45 actually bring us for this
device?

     Andrew

Re: [PATCH v2 03/15] net: phy: adin: hook genphy_{suspend,resume} into the driver

[Andrew Lunn]

On Thu, Aug 08, 2019 at 03:30:14PM +0300, Alexandru Ardelean wrote:
> The chip supports standard suspend/resume via BMCR reg.
> Hook these functions into the `adin` driver.
> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

Re: [PATCH v2 04/15] net: phy: adin: add support for interrupts

[Andrew Lunn]

On Thu, Aug 08, 2019 at 03:30:15PM +0300, Alexandru Ardelean wrote:
> This change adds support for enabling PHY interrupts that can be used by
> the PHY framework to get signal for link/speed/auto-negotiation changes.
> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

Re: [PATCH v2 05/15] net: phy: adin: add {write,read}_mmd hooks

[Andrew Lunn]

On Thu, Aug 08, 2019 at 03:30:16PM +0300, Alexandru Ardelean wrote:
> Both ADIN1200 & ADIN1300 support Clause 45 access.
> The Extended Management Interface (EMI) registers are accessible via both
> Clause 45 (at register MDIO_MMD_VEND1) and using Clause 22.
> 
> However, the Clause 22 MMD access operations differ from the implementation
> in the kernel, in the sense that it uses registers ExtRegPtr (0x10) &
> ExtRegData (0x11) to access Clause 45 & EMI registers.

It is not that they differ from what the kernel supports. Its that
they differ from what the Standard says they should use. These
registers are defined in 802.3, part of C22, and this hardware
implements the standard incorrectly.

	   Andrew

Re: [PATCH v2 06/15] net: phy: adin: configure RGMII/RMII/MII modes on config

[Andrew Lunn]

On Thu, Aug 08, 2019 at 03:30:17PM +0300, Alexandru Ardelean wrote:
> The ADIN1300 chip supports RGMII, RMII & MII modes. Default (if
> unconfigured) is RGMII.
> This change adds support for configuring these modes via the device
> registers.
> 
> For RGMII with internal delays (modes RGMII_ID,RGMII_TXID, RGMII_RXID),
> the default delay is 2 ns. This can be configurable and will be done in
> a subsequent change.
> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

Re: [PATCH v2 07/15] net: phy: adin: make RGMII internal delays configurable

[Andrew Lunn]

On Thu, Aug 08, 2019 at 03:30:18PM +0300, Alexandru Ardelean wrote:
> The internal delays for the RGMII are configurable for both RX & TX. This
> change adds support for configuring them via device-tree (or ACPI).
> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

Re: [PATCH v2 08/15] net: phy: adin: make RMII fifo depth configurable

[Andrew Lunn]

On Thu, Aug 08, 2019 at 03:30:19PM +0300, Alexandru Ardelean wrote:
> The FIFO depth can be configured for the RMII mode. This change adds
> support for doing this via device-tree (or ACPI).
> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

Re: [PATCH v2 00/15] net: phy: adin: add support for Analog Devices PHYs

[David Miller]

From: Alexandru Ardelean <alexandru.ardelean@analog.com>
Date: Thu, 8 Aug 2019 15:30:11 +0300

> This changeset adds support for Analog Devices Industrial Ethernet PHYs.
> Particularly the PHYs this driver adds support for:
>  * ADIN1200 - Robust, Industrial, Low Power 10/100 Ethernet PHY
>  * ADIN1300 - Robust, Industrial, Low Latency 10/100/1000 Gigabit
>    Ethernet PHY
> 
> The 2 chips are pin & register compatible with one another. The main
> difference being that ADIN1200 doesn't operate in gigabit mode.
> 
> The chips can be operated by the Generic PHY driver as well via the
> standard IEEE PHY registers (0x0000 - 0x000F) which are supported by the
> kernel as well. This assumes that configuration of the PHY has been done
> completely in HW, according to spec, i.e. no extra SW configuration
> required.
> 
> This changeset also implements the ability to configure the chips via SW
> registers.
> 
> Datasheets:
>   https://www.analog.com/media/en/technical-documentation/data-sheets/ADIN1300.pdf
>   https://www.analog.com/media/en/technical-documentation/data-sheets/ADIN1200.pdf
> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>

I think, at a minimum, the c22 vs. c45 issues need to be discussed more
and even if no code changes occur there is definitely some adjustments
and clairifications that need to occur on this issue in the commit
messages and/or documentation.

Re: [PATCH v2 02/15] net: phy: adin: hook genphy_read_abilities() to get_features

[Heiner Kallweit]

On 08.08.2019 17:24, Andrew Lunn wrote:
> On Thu, Aug 08, 2019 at 03:30:13PM +0300, Alexandru Ardelean wrote:
>> The ADIN PHYs can operate with Clause 45, however they are not typical for
>> how phylib considers Clause 45 PHYs.
>>
>> If the `features` field & the `get_features` hook are unspecified, and the
>> device wants to operate via Clause 45, it would also try to read features
>> via the `genphy_c45_pma_read_abilities()`, which will try to read PMA regs
>> that are unsupported.
>>
>> Hooking the `genphy_read_abilities()` function to the `get_features` hook
>> will ensure that this does not happen and the PHY features are read
>> correctly regardless of Clause 22 or Clause 45 operation.
> 
> I think we need to stop and think about a PHY which supports both C22
> and C45.
> 
> How does bus enumeration work? Is it discovered twice?  I've always
> considered phydev->is_c45 means everything is c45, not that some
> registers can be accessed via c45. But the driver is mixing c22 and
> c45. Does the driver actually require c45? Are some features which are
> only accessibly via C45? What does C45 actually bring us for this
> device?
> 
genphy_c45_pma_read_abilities() is only called if phydev->is_c45 is set.
And this flag means that the PHY complies with Clause 45 incl. all the
standard devices like PMA. In the case here only some vendor-specific
registers can be accessed via Clause 45 and therefore is_c45 shouldn't
bet set. As a consequence this patch isn't needed.

>      Andrew
> 
Heiner

Re: [PATCH v2 13/15] net: phy: adin: configure downshift on config_init

[Heiner Kallweit]

On 08.08.2019 14:30, Alexandru Ardelean wrote:
> Down-speed auto-negotiation may not always be enabled, in which case the
> PHY won't down-shift to 100 or 10 during auto-negotiation.
> 
> This change enables downshift and configures the number of retries to
> default 8 (maximum supported value).
> 
> The change has been adapted from the Marvell PHY driver.
> 
Instead of a fixed downshift setting (like in the Marvell driver) you
may consider to implement the ethtool phy-tunable ETHTOOL_PHY_DOWNSHIFT.
See the Aquantia PHY driver for an example.
Then the user can configure whether he wants downshift and if yes after
how many retries.

> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
> ---
>  drivers/net/phy/adin.c | 39 +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 39 insertions(+)
[...]

Heiner

Re: [PATCH v2 13/15] net: phy: adin: configure downshift on config_init

[Andrew Lunn]

On Thu, Aug 08, 2019 at 09:38:40PM +0200, Heiner Kallweit wrote:
> On 08.08.2019 14:30, Alexandru Ardelean wrote:
> > Down-speed auto-negotiation may not always be enabled, in which case the
> > PHY won't down-shift to 100 or 10 during auto-negotiation.
> > 
> > This change enables downshift and configures the number of retries to
> > default 8 (maximum supported value).
> > 
> > The change has been adapted from the Marvell PHY driver.
> > 
> Instead of a fixed downshift setting (like in the Marvell driver) you
> may consider to implement the ethtool phy-tunable ETHTOOL_PHY_DOWNSHIFT.

Hi Alexandru

Upps, sorry, my bad.

I looked at marvell_set_downshift(), and assumed it was connected to
the phy-tunable. I have patches somewhere which does that. But they
have not made it into mainline yet.

> See the Aquantia PHY driver for an example.

Yes, that does have all the tunable stuff.

     Andrew

Re: [PATCH v2 15/15] dt-bindings: net: add bindings for ADIN PHY driver

[Rob Herring]

On Thu, Aug 8, 2019 at 6:31 AM Alexandru Ardelean
<alexandru.ardelean@analog.com> wrote:
>
> This change adds bindings for the Analog Devices ADIN PHY driver, detailing
> all the properties implemented by the driver.
>
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
> ---
>  .../devicetree/bindings/net/adi,adin.yaml     | 76 +++++++++++++++++++
>  MAINTAINERS                                   |  1 +
>  2 files changed, 77 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/adi,adin.yaml
>
> diff --git a/Documentation/devicetree/bindings/net/adi,adin.yaml b/Documentation/devicetree/bindings/net/adi,adin.yaml
> new file mode 100644
> index 000000000000..86177c8fe23a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/adi,adin.yaml
> @@ -0,0 +1,76 @@
> +# SPDX-License-Identifier: GPL-2.0+
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/adi,adin.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices ADIN1200/ADIN1300 PHY
> +
> +maintainers:
> +  - Alexandru Ardelean <alexandru.ardelean@analog.com>
> +
> +description: |
> +  Bindings for Analog Devices Industrial Ethernet PHYs
> +
> +allOf:
> +  - $ref: ethernet-phy.yaml#
> +
> +properties:
> +  adi,rx-internal-delay-ps:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: |
> +      RGMII RX Clock Delay used only when PHY operates in RGMII mode with
> +      internal delay (phy-mode is 'rgmii-id' or 'rgmii-rxid') in pico-seconds.
> +    enum: [ 1600, 1800, 2000, 2200, 2400 ]
> +    default: 2000

This doesn't actually do what you think. The '$ref' has to be under an
'allOf' to work. It's an oddity of json-schema. However, anything with
a standard unit suffix already has a schema to define the type, so you
don't need to here and can just drop $ref.

> +
> +  adi,tx-internal-delay-ps:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: |
> +      RGMII TX Clock Delay used only when PHY operates in RGMII mode with
> +      internal delay (phy-mode is 'rgmii-id' or 'rgmii-txid') in pico-seconds.
> +    enum: [ 1600, 1800, 2000, 2200, 2400 ]
> +    default: 2000
> +
> +  adi,fifo-depth-bits:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: |
> +      When operating in RMII mode, this option configures the FIFO depth.
> +    enum: [ 4, 8, 12, 16, 20, 24 ]
> +    default: 8
> +
> +  adi,disable-energy-detect:
> +    description: |
> +      Disables Energy Detect Powerdown Mode (default disabled, i.e energy detect
> +      is enabled if this property is unspecified)
> +    type: boolean
> +
> +examples:
> +  - |
> +    ethernet {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        phy-mode = "rgmii-id";
> +
> +        ethernet-phy@0 {
> +            reg = <0>;
> +
> +            adi,rx-internal-delay-ps = <1800>;
> +            adi,tx-internal-delay-ps = <2200>;
> +        };
> +    };
> +  - |
> +    ethernet {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        phy-mode = "rmii";
> +
> +        ethernet-phy@1 {
> +            reg = <1>;
> +
> +            adi,fifo-depth-bits = <16>;
> +            adi,disable-energy-detect;
> +        };
> +    };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index e8aa8a667864..fd9ab61c2670 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -944,6 +944,7 @@ L:  netdev@vger.kernel.org
>  W:     http://ez.analog.com/community/linux-device-drivers
>  S:     Supported
>  F:     drivers/net/phy/adin.c
> +F:     Documentation/devicetree/bindings/net/adi,adin.yaml
>
>  ANALOG DEVICES INC ADIS DRIVER LIBRARY
>  M:     Alexandru Ardelean <alexandru.ardelean@analog.com>
> --
> 2.20.1
>

Re: [PATCH v2 02/15] net: phy: adin: hook genphy_read_abilities() to get_features

[Ardelean, Alexandru]

On Thu, 2019-08-08 at 21:32 +0200, Heiner Kallweit wrote:
> [External]
> 
> On 08.08.2019 17:24, Andrew Lunn wrote:
> > On Thu, Aug 08, 2019 at 03:30:13PM +0300, Alexandru Ardelean wrote:
> > > The ADIN PHYs can operate with Clause 45, however they are not typical for
> > > how phylib considers Clause 45 PHYs.
> > > 
> > > If the `features` field & the `get_features` hook are unspecified, and the
> > > device wants to operate via Clause 45, it would also try to read features
> > > via the `genphy_c45_pma_read_abilities()`, which will try to read PMA regs
> > > that are unsupported.
> > > 
> > > Hooking the `genphy_read_abilities()` function to the `get_features` hook
> > > will ensure that this does not happen and the PHY features are read
> > > correctly regardless of Clause 22 or Clause 45 operation.
> > 
> > I think we need to stop and think about a PHY which supports both C22
> > and C45.
> > 
> > How does bus enumeration work? Is it discovered twice?  I've always
> > considered phydev->is_c45 means everything is c45, not that some
> > registers can be accessed via c45. But the driver is mixing c22 and
> > c45. Does the driver actually require c45? Are some features which are
> > only accessibly via C45? What does C45 actually bring us for this
> > device?
> > 

Hmm, I can't answer [all] these questions.

These PHYs seem to be a bit different from the rest that I looked at in drivers/net/phy with regard to C45 & C22.
And C45 seems to be more/closer related to 10G PHYs [from what I can tell].

The ADIN PHYs can operate only in C22.
The only thing that is needed [and a bit special] is EEE, which [for C22] requires the translation layer to convert C45
reg addresses to internal C22 equivalent.

> genphy_c45_pma_read_abilities() is only called if phydev->is_c45 is set.
> And this flag means that the PHY complies with Clause 45 incl. all the
> standard devices like PMA. In the case here only some vendor-specific
> registers can be accessed via Clause 45 and therefore is_c45 shouldn't
> bet set. As a consequence this patch isn't needed.

ack, will drop patch

> 
> >      Andrew
> > 
> Heiner
> 

Re: [PATCH v2 05/15] net: phy: adin: add {write,read}_mmd hooks

[Ardelean, Alexandru]

On Thu, 2019-08-08 at 17:35 +0200, Andrew Lunn wrote:
> [External]
> 
> On Thu, Aug 08, 2019 at 03:30:16PM +0300, Alexandru Ardelean wrote:
> > Both ADIN1200 & ADIN1300 support Clause 45 access.
> > The Extended Management Interface (EMI) registers are accessible via both
> > Clause 45 (at register MDIO_MMD_VEND1) and using Clause 22.
> > 
> > However, the Clause 22 MMD access operations differ from the implementation
> > in the kernel, in the sense that it uses registers ExtRegPtr (0x10) &
> > ExtRegData (0x11) to access Clause 45 & EMI registers.
> 
> It is not that they differ from what the kernel supports. Its that
> they differ from what the Standard says they should use. These
> registers are defined in 802.3, part of C22, and this hardware
> implements the standard incorrectly.

Will update comment.
I did not find a document describing this as a standard.
But, I admit I am terrible when finding some docs.

I only found this presentation from a while back:
http://www.ieee802.org/3/efm/public/nov02/oam/pannell_oam_1_1102.pdf

It seemed more like a proposal.

Thanks
Alex

> 
> 	   Andrew

Re: [PATCH v2 13/15] net: phy: adin: configure downshift on config_init

[Ardelean, Alexandru]

On Thu, 2019-08-08 at 22:39 +0200, Andrew Lunn wrote:
> [External]
> 
> On Thu, Aug 08, 2019 at 09:38:40PM +0200, Heiner Kallweit wrote:
> > On 08.08.2019 14:30, Alexandru Ardelean wrote:
> > > Down-speed auto-negotiation may not always be enabled, in which case the
> > > PHY won't down-shift to 100 or 10 during auto-negotiation.
> > > 
> > > This change enables downshift and configures the number of retries to
> > > default 8 (maximum supported value).
> > > 
> > > The change has been adapted from the Marvell PHY driver.
> > > 
> > Instead of a fixed downshift setting (like in the Marvell driver) you
> > may consider to implement the ethtool phy-tunable ETHTOOL_PHY_DOWNSHIFT.
> 
> Hi Alexandru
> 
> Upps, sorry, my bad.
> 
> I looked at marvell_set_downshift(), and assumed it was connected to
> the phy-tunable. I have patches somewhere which does that. But they
> have not made it into mainline yet.
> 
> > See the Aquantia PHY driver for an example.
> 
> Yes, that does have all the tunable stuff.

Ack.
Will use that

> 
>      Andrew

Re: [PATCH v2 15/15] dt-bindings: net: add bindings for ADIN PHY driver

[Ardelean, Alexandru]

On Thu, 2019-08-08 at 17:03 -0600, Rob Herring wrote:
> [External]
> 
> On Thu, Aug 8, 2019 at 6:31 AM Alexandru Ardelean
> <alexandru.ardelean@analog.com> wrote:
> > This change adds bindings for the Analog Devices ADIN PHY driver, detailing
> > all the properties implemented by the driver.
> > 
> > Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
> > ---
> >  .../devicetree/bindings/net/adi,adin.yaml     | 76 +++++++++++++++++++
> >  MAINTAINERS                                   |  1 +
> >  2 files changed, 77 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/net/adi,adin.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/net/adi,adin.yaml
> > b/Documentation/devicetree/bindings/net/adi,adin.yaml
> > new file mode 100644
> > index 000000000000..86177c8fe23a
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/net/adi,adin.yaml
> > @@ -0,0 +1,76 @@
> > +# SPDX-License-Identifier: GPL-2.0+
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/net/adi,adin.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Analog Devices ADIN1200/ADIN1300 PHY
> > +
> > +maintainers:
> > +  - Alexandru Ardelean <alexandru.ardelean@analog.com>
> > +
> > +description: |
> > +  Bindings for Analog Devices Industrial Ethernet PHYs
> > +
> > +allOf:
> > +  - $ref: ethernet-phy.yaml#
> > +
> > +properties:
> > +  adi,rx-internal-delay-ps:
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    description: |
> > +      RGMII RX Clock Delay used only when PHY operates in RGMII mode with
> > +      internal delay (phy-mode is 'rgmii-id' or 'rgmii-rxid') in pico-seconds.
> > +    enum: [ 1600, 1800, 2000, 2200, 2400 ]
> > +    default: 2000
> 
> This doesn't actually do what you think. The '$ref' has to be under an
> 'allOf' to work. It's an oddity of json-schema. However, anything with
> a standard unit suffix already has a schema to define the type, so you
> don't need to here and can just drop $ref.

ack
will drop

> 
> > +
> > +  adi,tx-internal-delay-ps:
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    description: |
> > +      RGMII TX Clock Delay used only when PHY operates in RGMII mode with
> > +      internal delay (phy-mode is 'rgmii-id' or 'rgmii-txid') in pico-seconds.
> > +    enum: [ 1600, 1800, 2000, 2200, 2400 ]
> > +    default: 2000
> > +
> > +  adi,fifo-depth-bits:
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    description: |
> > +      When operating in RMII mode, this option configures the FIFO depth.
> > +    enum: [ 4, 8, 12, 16, 20, 24 ]
> > +    default: 8
> > +
> > +  adi,disable-energy-detect:
> > +    description: |
> > +      Disables Energy Detect Powerdown Mode (default disabled, i.e energy detect
> > +      is enabled if this property is unspecified)
> > +    type: boolean
> > +
> > +examples:
> > +  - |
> > +    ethernet {
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +
> > +        phy-mode = "rgmii-id";
> > +
> > +        ethernet-phy@0 {
> > +            reg = <0>;
> > +
> > +            adi,rx-internal-delay-ps = <1800>;
> > +            adi,tx-internal-delay-ps = <2200>;
> > +        };
> > +    };
> > +  - |
> > +    ethernet {
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +
> > +        phy-mode = "rmii";
> > +
> > +        ethernet-phy@1 {
> > +            reg = <1>;
> > +
> > +            adi,fifo-depth-bits = <16>;
> > +            adi,disable-energy-detect;
> > +        };
> > +    };
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index e8aa8a667864..fd9ab61c2670 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -944,6 +944,7 @@ L:  netdev@vger.kernel.org
> >  W:     http://ez.analog.com/community/linux-device-drivers
> >  S:     Supported
> >  F:     drivers/net/phy/adin.c
> > +F:     Documentation/devicetree/bindings/net/adi,adin.yaml
> > 
> >  ANALOG DEVICES INC ADIS DRIVER LIBRARY
> >  M:     Alexandru Ardelean <alexandru.ardelean@analog.com>
> > --
> > 2.20.1
> > 

Re: [PATCH v2 00/15] net: phy: adin: add support for Analog Devices PHYs

[Ardelean, Alexandru]

On Thu, 2019-08-08 at 11:24 -0700, David Miller wrote:
> [External]
> 
> From: Alexandru Ardelean <alexandru.ardelean@analog.com>
> Date: Thu, 8 Aug 2019 15:30:11 +0300
> 
> > This changeset adds support for Analog Devices Industrial Ethernet PHYs.
> > Particularly the PHYs this driver adds support for:
> >  * ADIN1200 - Robust, Industrial, Low Power 10/100 Ethernet PHY
> >  * ADIN1300 - Robust, Industrial, Low Latency 10/100/1000 Gigabit
> >    Ethernet PHY
> > 
> > The 2 chips are pin & register compatible with one another. The main
> > difference being that ADIN1200 doesn't operate in gigabit mode.
> > 
> > The chips can be operated by the Generic PHY driver as well via the
> > standard IEEE PHY registers (0x0000 - 0x000F) which are supported by the
> > kernel as well. This assumes that configuration of the PHY has been done
> > completely in HW, according to spec, i.e. no extra SW configuration
> > required.
> > 
> > This changeset also implements the ability to configure the chips via SW
> > registers.
> > 
> > Datasheets:
> >   https://www.analog.com/media/en/technical-documentation/data-sheets/ADIN1300.pdf
> >   https://www.analog.com/media/en/technical-documentation/data-sheets/ADIN1200.pdf
> > 
> > Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
> 
> I think, at a minimum, the c22 vs. c45 issues need to be discussed more
> and even if no code changes occur there is definitely some adjustments
> and clairifications that need to occur on this issue in the commit
> messages and/or documentation.

I guess I'll drop/defer some of the C45 stuff for now.
I don't know how decisions were done when the chips were created.
I am told that C45 works, but I may need to find out more on my end, since I am also new to/unclear on some items.

[My personal feeling about this]
I think there are some confusions [internally on our side] about what C45 is and how it should be done.
I guess it's part of developing knowledge/skills for developing PHYs as a company.
There's plenty of knowledge for how to do the electrical, low-power-stuff, etc, and even the datasheet sometimes feels
like it's for an ADC/DAC.
[My personal feeling about this]

Thanks
Alex