[PATCH net-next 0/5] net: phy: further decouple provider from consumer part

[PATCH net-next 0/5] net: phy: further decouple provider from consumer part

[Heiner Kallweit]

This series aims at further decoupling the provider and consumer part
in phylib.

Heiner Kallweit (5):
  net: phy: move mdio_device reset handling functions in the code
  net: phy: make mdio_device.c part of libphy
  net: phy: move (of_)mdio_find_bus to mdio_bus_provider.c
  net: phy: move registering mdio_bus_class and mdio_bus_type to libphy
  net: phy: move remaining provider code to mdio_bus_provider.c

 drivers/net/phy/Makefile            |   6 +-
 drivers/net/phy/mdio-private.h      |  11 -
 drivers/net/phy/mdio_bus.c          | 385 ----------------------------
 drivers/net/phy/mdio_bus_provider.c | 319 +++++++++++++++++++++++
 drivers/net/phy/mdio_device.c       | 165 +++++++-----
 drivers/net/phy/phy_device.c        |  13 +
 drivers/net/phy/phylib-internal.h   |   7 +
 include/linux/mdio.h                |   2 -
 include/linux/phy.h                 |   3 -
 9 files changed, 441 insertions(+), 470 deletions(-)
 delete mode 100644 drivers/net/phy/mdio-private.h

-- 
2.53.0

[PATCH net-next 1/5] net: phy: move mdio_device reset handling functions in the code

[Heiner Kallweit]

In preparation of a follow-up patch this moves reset-related functions
in the code.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/net/phy/mdio_device.c | 162 +++++++++++++++++-----------------
 1 file changed, 81 insertions(+), 81 deletions(-)

diff --git a/drivers/net/phy/mdio_device.c b/drivers/net/phy/mdio_device.c
index b8a5a183819..da4fb7484c7 100644
--- a/drivers/net/phy/mdio_device.c
+++ b/drivers/net/phy/mdio_device.c
@@ -24,6 +24,87 @@
 #include <linux/property.h>
 #include "mdio-private.h"
 
+/**
+ * mdio_device_register_reset - Read and initialize the reset properties of
+ *				an mdio device
+ * @mdiodev: mdio_device structure
+ *
+ * Return: Zero if successful, negative error code on failure
+ */
+int mdio_device_register_reset(struct mdio_device *mdiodev)
+{
+	struct reset_control *reset;
+
+	/* Deassert the optional reset signal */
+	mdiodev->reset_gpio = gpiod_get_optional(&mdiodev->dev,
+						 "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(mdiodev->reset_gpio))
+		return PTR_ERR(mdiodev->reset_gpio);
+
+	if (mdiodev->reset_gpio)
+		gpiod_set_consumer_name(mdiodev->reset_gpio, "PHY reset");
+
+	reset = reset_control_get_optional_exclusive(&mdiodev->dev, "phy");
+	if (IS_ERR(reset)) {
+		gpiod_put(mdiodev->reset_gpio);
+		mdiodev->reset_gpio = NULL;
+		return PTR_ERR(reset);
+	}
+
+	mdiodev->reset_ctrl = reset;
+
+	/* Read optional firmware properties */
+	device_property_read_u32(&mdiodev->dev, "reset-assert-us",
+				 &mdiodev->reset_assert_delay);
+	device_property_read_u32(&mdiodev->dev, "reset-deassert-us",
+				 &mdiodev->reset_deassert_delay);
+
+	return 0;
+}
+
+/**
+ * mdio_device_unregister_reset - uninitialize the reset properties of
+ *				  an mdio device
+ * @mdiodev: mdio_device structure
+ */
+void mdio_device_unregister_reset(struct mdio_device *mdiodev)
+{
+	gpiod_put(mdiodev->reset_gpio);
+	mdiodev->reset_gpio = NULL;
+	reset_control_put(mdiodev->reset_ctrl);
+	mdiodev->reset_ctrl = NULL;
+	mdiodev->reset_assert_delay = 0;
+	mdiodev->reset_deassert_delay = 0;
+}
+
+void mdio_device_reset(struct mdio_device *mdiodev, int value)
+{
+	unsigned int d;
+
+	if (!mdiodev->reset_gpio && !mdiodev->reset_ctrl)
+		return;
+
+	if (mdiodev->reset_state == value)
+		return;
+
+	if (mdiodev->reset_gpio)
+		gpiod_set_value_cansleep(mdiodev->reset_gpio, value);
+
+	if (mdiodev->reset_ctrl) {
+		if (value)
+			reset_control_assert(mdiodev->reset_ctrl);
+		else
+			reset_control_deassert(mdiodev->reset_ctrl);
+	}
+
+	d = value ? mdiodev->reset_assert_delay : mdiodev->reset_deassert_delay;
+	if (d)
+		fsleep(d);
+
+	mdiodev->reset_state = value;
+}
+EXPORT_SYMBOL(mdio_device_reset);
+
 void mdio_device_free(struct mdio_device *mdiodev)
 {
 	put_device(&mdiodev->dev);
@@ -108,87 +189,6 @@ void mdio_device_remove(struct mdio_device *mdiodev)
 }
 EXPORT_SYMBOL(mdio_device_remove);
 
-/**
- * mdio_device_register_reset - Read and initialize the reset properties of
- *				an mdio device
- * @mdiodev: mdio_device structure
- *
- * Return: Zero if successful, negative error code on failure
- */
-int mdio_device_register_reset(struct mdio_device *mdiodev)
-{
-	struct reset_control *reset;
-
-	/* Deassert the optional reset signal */
-	mdiodev->reset_gpio = gpiod_get_optional(&mdiodev->dev,
-						 "reset", GPIOD_OUT_LOW);
-	if (IS_ERR(mdiodev->reset_gpio))
-		return PTR_ERR(mdiodev->reset_gpio);
-
-	if (mdiodev->reset_gpio)
-		gpiod_set_consumer_name(mdiodev->reset_gpio, "PHY reset");
-
-	reset = reset_control_get_optional_exclusive(&mdiodev->dev, "phy");
-	if (IS_ERR(reset)) {
-		gpiod_put(mdiodev->reset_gpio);
-		mdiodev->reset_gpio = NULL;
-		return PTR_ERR(reset);
-	}
-
-	mdiodev->reset_ctrl = reset;
-
-	/* Read optional firmware properties */
-	device_property_read_u32(&mdiodev->dev, "reset-assert-us",
-				 &mdiodev->reset_assert_delay);
-	device_property_read_u32(&mdiodev->dev, "reset-deassert-us",
-				 &mdiodev->reset_deassert_delay);
-
-	return 0;
-}
-
-/**
- * mdio_device_unregister_reset - uninitialize the reset properties of
- *				  an mdio device
- * @mdiodev: mdio_device structure
- */
-void mdio_device_unregister_reset(struct mdio_device *mdiodev)
-{
-	gpiod_put(mdiodev->reset_gpio);
-	mdiodev->reset_gpio = NULL;
-	reset_control_put(mdiodev->reset_ctrl);
-	mdiodev->reset_ctrl = NULL;
-	mdiodev->reset_assert_delay = 0;
-	mdiodev->reset_deassert_delay = 0;
-}
-
-void mdio_device_reset(struct mdio_device *mdiodev, int value)
-{
-	unsigned int d;
-
-	if (!mdiodev->reset_gpio && !mdiodev->reset_ctrl)
-		return;
-
-	if (mdiodev->reset_state == value)
-		return;
-
-	if (mdiodev->reset_gpio)
-		gpiod_set_value_cansleep(mdiodev->reset_gpio, value);
-
-	if (mdiodev->reset_ctrl) {
-		if (value)
-			reset_control_assert(mdiodev->reset_ctrl);
-		else
-			reset_control_deassert(mdiodev->reset_ctrl);
-	}
-
-	d = value ? mdiodev->reset_assert_delay : mdiodev->reset_deassert_delay;
-	if (d)
-		fsleep(d);
-
-	mdiodev->reset_state = value;
-}
-EXPORT_SYMBOL(mdio_device_reset);
-
 /**
  * mdio_probe - probe an MDIO device
  * @dev: device to probe
-- 
2.53.0

[PATCH net-next 2/5] net: phy: make mdio_device.c part of libphy

[Heiner Kallweit]

This patch
- makes mdio_device.c part of libphy
- makes mdio_device_(un)register_reset() static
- moves mdiobus_(un)register_device() from mdio_bus.c to mdio_device.c,
  stops exporting both functions and makes them private to phylib

This further decouples the MDIO consumer functionality from libphy.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/net/phy/Makefile          |  6 ++---
 drivers/net/phy/mdio-private.h    | 11 ---------
 drivers/net/phy/mdio_bus.c        | 36 ----------------------------
 drivers/net/phy/mdio_device.c     | 39 ++++++++++++++++++++++++++++---
 drivers/net/phy/phylib-internal.h |  4 ++++
 include/linux/mdio.h              |  2 --
 6 files changed, 43 insertions(+), 55 deletions(-)
 delete mode 100644 drivers/net/phy/mdio-private.h

diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index 3a34917adea..8d262b4e2be 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -3,8 +3,8 @@
 
 libphy-y			:= phy.o phy-c45.o phy-core.o phy_device.o \
 				   linkmode.o phy_link_topology.o \
-				   phy_caps.o mdio_bus_provider.o phy_port.o
-mdio-bus-y			+= mdio_bus.o mdio_device.o
+				   phy_caps.o mdio_bus_provider.o phy_port.o \
+				   mdio_device.o
 
 ifdef CONFIG_PHYLIB
 # built-in whenever PHYLIB is built-in or module
@@ -15,7 +15,7 @@ libphy-$(CONFIG_SWPHY)		+= swphy.o
 libphy-$(CONFIG_LED_TRIGGER_PHY)	+= phy_led_triggers.o
 libphy-$(CONFIG_OPEN_ALLIANCE_HELPERS) += open_alliance_helpers.o
 
-obj-$(CONFIG_MDIO_BUS)		+= mdio-bus.o
+obj-$(CONFIG_MDIO_BUS)		+= mdio_bus.o
 obj-$(CONFIG_PHYLINK)		+= phylink.o
 obj-$(CONFIG_PHYLIB)		+= libphy.o
 obj-$(CONFIG_PHYLIB)		+= mdio_devres.o
diff --git a/drivers/net/phy/mdio-private.h b/drivers/net/phy/mdio-private.h
deleted file mode 100644
index 8bc6d9088af..00000000000
--- a/drivers/net/phy/mdio-private.h
+++ /dev/null
@@ -1,11 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-#ifndef __MDIO_PRIVATE_H
-#define __MDIO_PRIVATE_H
-
-/* MDIO internal helpers
- */
-
-int mdio_device_register_reset(struct mdio_device *mdiodev);
-void mdio_device_unregister_reset(struct mdio_device *mdiodev);
-
-#endif /* __MDIO_PRIVATE_H */
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 48c0447e6a8..a30c679feec 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -29,46 +29,10 @@
 #include <linux/string.h>
 #include <linux/uaccess.h>
 #include <linux/unistd.h>
-#include "mdio-private.h"
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/mdio.h>
 
-int mdiobus_register_device(struct mdio_device *mdiodev)
-{
-	int err;
-
-	if (mdiodev->bus->mdio_map[mdiodev->addr])
-		return -EBUSY;
-
-	if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY) {
-		err = mdio_device_register_reset(mdiodev);
-		if (err)
-			return err;
-
-		/* Assert the reset signal */
-		mdio_device_reset(mdiodev, 1);
-	}
-
-	mdiodev->bus->mdio_map[mdiodev->addr] = mdiodev;
-
-	return 0;
-}
-EXPORT_SYMBOL(mdiobus_register_device);
-
-int mdiobus_unregister_device(struct mdio_device *mdiodev)
-{
-	if (mdiodev->bus->mdio_map[mdiodev->addr] != mdiodev)
-		return -EINVAL;
-
-	mdio_device_unregister_reset(mdiodev);
-
-	mdiodev->bus->mdio_map[mdiodev->addr] = NULL;
-
-	return 0;
-}
-EXPORT_SYMBOL(mdiobus_unregister_device);
-
 static struct mdio_device *mdiobus_find_device(struct mii_bus *bus, int addr)
 {
 	bool addr_valid = addr >= 0 && addr < ARRAY_SIZE(bus->mdio_map);
diff --git a/drivers/net/phy/mdio_device.c b/drivers/net/phy/mdio_device.c
index da4fb7484c7..56080d3d2d2 100644
--- a/drivers/net/phy/mdio_device.c
+++ b/drivers/net/phy/mdio_device.c
@@ -22,7 +22,7 @@
 #include <linux/string.h>
 #include <linux/unistd.h>
 #include <linux/property.h>
-#include "mdio-private.h"
+#include "phylib-internal.h"
 
 /**
  * mdio_device_register_reset - Read and initialize the reset properties of
@@ -31,7 +31,7 @@
  *
  * Return: Zero if successful, negative error code on failure
  */
-int mdio_device_register_reset(struct mdio_device *mdiodev)
+static int mdio_device_register_reset(struct mdio_device *mdiodev)
 {
 	struct reset_control *reset;
 
@@ -67,7 +67,7 @@ int mdio_device_register_reset(struct mdio_device *mdiodev)
  *				  an mdio device
  * @mdiodev: mdio_device structure
  */
-void mdio_device_unregister_reset(struct mdio_device *mdiodev)
+static void mdio_device_unregister_reset(struct mdio_device *mdiodev)
 {
 	gpiod_put(mdiodev->reset_gpio);
 	mdiodev->reset_gpio = NULL;
@@ -189,6 +189,39 @@ void mdio_device_remove(struct mdio_device *mdiodev)
 }
 EXPORT_SYMBOL(mdio_device_remove);
 
+int mdiobus_register_device(struct mdio_device *mdiodev)
+{
+	int err;
+
+	if (mdiodev->bus->mdio_map[mdiodev->addr])
+		return -EBUSY;
+
+	if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY) {
+		err = mdio_device_register_reset(mdiodev);
+		if (err)
+			return err;
+
+		/* Assert the reset signal */
+		mdio_device_reset(mdiodev, 1);
+	}
+
+	mdiodev->bus->mdio_map[mdiodev->addr] = mdiodev;
+
+	return 0;
+}
+
+int mdiobus_unregister_device(struct mdio_device *mdiodev)
+{
+	if (mdiodev->bus->mdio_map[mdiodev->addr] != mdiodev)
+		return -EINVAL;
+
+	mdio_device_unregister_reset(mdiodev);
+
+	mdiodev->bus->mdio_map[mdiodev->addr] = NULL;
+
+	return 0;
+}
+
 /**
  * mdio_probe - probe an MDIO device
  * @dev: device to probe
diff --git a/drivers/net/phy/phylib-internal.h b/drivers/net/phy/phylib-internal.h
index dc9592c6bb8..bfb1aa82386 100644
--- a/drivers/net/phy/phylib-internal.h
+++ b/drivers/net/phy/phylib-internal.h
@@ -6,6 +6,7 @@
 #ifndef __PHYLIB_INTERNAL_H
 #define __PHYLIB_INTERNAL_H
 
+struct mdio_device;
 struct phy_device;
 
 /*
@@ -20,6 +21,9 @@ void of_set_phy_timing_role(struct phy_device *phydev);
 int phy_speed_down_core(struct phy_device *phydev);
 void phy_check_downshift(struct phy_device *phydev);
 
+int mdiobus_register_device(struct mdio_device *mdiodev);
+int mdiobus_unregister_device(struct mdio_device *mdiodev);
+
 int genphy_c45_read_eee_adv(struct phy_device *phydev, unsigned long *adv);
 
 #endif /* __PHYLIB_INTERNAL_H */
diff --git a/include/linux/mdio.h b/include/linux/mdio.h
index 5d1203b9af2..f4f9d960944 100644
--- a/include/linux/mdio.h
+++ b/include/linux/mdio.h
@@ -688,8 +688,6 @@ static inline int mdiodev_c45_write(struct mdio_device *mdiodev, u32 devad,
 				 val);
 }
 
-int mdiobus_register_device(struct mdio_device *mdiodev);
-int mdiobus_unregister_device(struct mdio_device *mdiodev);
 bool mdiobus_is_registered_device(struct mii_bus *bus, int addr);
 struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr);
 
-- 
2.53.0

Re: [PATCH net-next 2/5] net: phy: make mdio_device.c part of libphy

[kernel test robot]

Hi Heiner,

kernel test robot noticed the following build errors:

[auto build test ERROR on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Heiner-Kallweit/net-phy-move-mdio_device-reset-handling-functions-in-the-code/20260308-053505
base:   net-next/main
patch link:    https://lore.kernel.org/r/8600cf79-7604-43c1-8cc0-306e58e31153%40gmail.com
patch subject: [PATCH net-next 2/5] net: phy: make mdio_device.c part of libphy
config: sparc64-randconfig-002-20260308 (https://download.01.org/0day-ci/archive/20260308/202603082137.KWkiQ4Ij-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260308/202603082137.KWkiQ4Ij-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603082137.KWkiQ4Ij-lkp@intel.com/

All errors (new ones prefixed by >>):

   sparc64-linux-ld: drivers/phy/broadcom/phy-bcm-ns-usb3.o: in function `bcm_ns_usb3_mdio_driver_init':
>> drivers/phy/broadcom/phy-bcm-ns-usb3.c:241: undefined reference to `mdio_driver_register'
   sparc64-linux-ld: drivers/phy/broadcom/phy-bcm-ns-usb3.o: in function `bcm_ns_usb3_mdio_driver_exit':
>> drivers/phy/broadcom/phy-bcm-ns-usb3.c:241: undefined reference to `mdio_driver_unregister'
   sparc64-linux-ld: drivers/phy/broadcom/phy-bcm-ns2-pcie.o: in function `ns2_pci_phy_driver_init':
>> drivers/phy/broadcom/phy-bcm-ns2-pcie.c:82: undefined reference to `mdio_driver_register'
   sparc64-linux-ld: drivers/phy/broadcom/phy-bcm-ns2-pcie.o: in function `ns2_pci_phy_driver_exit':
>> drivers/phy/broadcom/phy-bcm-ns2-pcie.c:82: undefined reference to `mdio_driver_unregister'


vim +241 drivers/phy/broadcom/phy-bcm-ns-usb3.c

af850e14a7ae49 drivers/phy/broadcom/phy-bcm-ns-usb3.c Rafał Miłecki 2017-06-08  240  
36a94760c98954 drivers/phy/broadcom/phy-bcm-ns-usb3.c Rafał Miłecki 2020-11-13 @241  mdio_module_driver(bcm_ns_usb3_mdio_driver);
e5666281d9eadb drivers/phy/phy-bcm-ns-usb3.c          Rafał Miłecki 2016-08-12  242  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

[PATCH net-next 3/5] net: phy: move (of_)mdio_find_bus to mdio_bus_provider.c

[Heiner Kallweit]

Functionality outside libphy shouldn't access mdio_bus_class directly.
So move both functions to the provider side. This is a step towards
making mdio_bus_class private to libphy.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/net/phy/mdio_bus.c          | 44 -----------------------------
 drivers/net/phy/mdio_bus_provider.c | 44 +++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 44 deletions(-)

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index a30c679feec..c9a495390d2 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -276,50 +276,6 @@ const struct class mdio_bus_class = {
 };
 EXPORT_SYMBOL_GPL(mdio_bus_class);
 
-/**
- * mdio_find_bus - Given the name of a mdiobus, find the mii_bus.
- * @mdio_name: The name of a mdiobus.
- *
- * Return: a reference to the mii_bus, or NULL if none found. The
- * embedded struct device will have its reference count incremented,
- * and this must be put_deviced'ed once the bus is finished with.
- */
-struct mii_bus *mdio_find_bus(const char *mdio_name)
-{
-	struct device *d;
-
-	d = class_find_device_by_name(&mdio_bus_class, mdio_name);
-	return d ? to_mii_bus(d) : NULL;
-}
-EXPORT_SYMBOL(mdio_find_bus);
-
-#if IS_ENABLED(CONFIG_OF_MDIO)
-/**
- * of_mdio_find_bus - Given an mii_bus node, find the mii_bus.
- * @mdio_bus_np: Pointer to the mii_bus.
- *
- * Return: a reference to the mii_bus, or NULL if none found. The
- * embedded struct device will have its reference count incremented,
- * and this must be put once the bus is finished with.
- *
- * Because the association of a device_node and mii_bus is made via
- * of_mdiobus_register(), the mii_bus cannot be found before it is
- * registered with of_mdiobus_register().
- *
- */
-struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np)
-{
-	struct device *d;
-
-	if (!mdio_bus_np)
-		return NULL;
-
-	d = class_find_device_by_of_node(&mdio_bus_class, mdio_bus_np);
-	return d ? to_mii_bus(d) : NULL;
-}
-EXPORT_SYMBOL(of_mdio_find_bus);
-#endif
-
 static void mdiobus_stats_acct(struct mdio_bus_stats *stats, bool op, int ret)
 {
 	preempt_disable();
diff --git a/drivers/net/phy/mdio_bus_provider.c b/drivers/net/phy/mdio_bus_provider.c
index 4b063740574..d50fe6eb4b0 100644
--- a/drivers/net/phy/mdio_bus_provider.c
+++ b/drivers/net/phy/mdio_bus_provider.c
@@ -440,3 +440,47 @@ void mdiobus_free(struct mii_bus *bus)
 	put_device(&bus->dev);
 }
 EXPORT_SYMBOL(mdiobus_free);
+
+/**
+ * mdio_find_bus - Given the name of a mdiobus, find the mii_bus.
+ * @mdio_name: The name of a mdiobus.
+ *
+ * Return: a reference to the mii_bus, or NULL if none found. The
+ * embedded struct device will have its reference count incremented,
+ * and this must be put_deviced'ed once the bus is finished with.
+ */
+struct mii_bus *mdio_find_bus(const char *mdio_name)
+{
+	struct device *d;
+
+	d = class_find_device_by_name(&mdio_bus_class, mdio_name);
+	return d ? to_mii_bus(d) : NULL;
+}
+EXPORT_SYMBOL(mdio_find_bus);
+
+#if IS_ENABLED(CONFIG_OF_MDIO)
+/**
+ * of_mdio_find_bus - Given an mii_bus node, find the mii_bus.
+ * @mdio_bus_np: Pointer to the mii_bus.
+ *
+ * Return: a reference to the mii_bus, or NULL if none found. The
+ * embedded struct device will have its reference count incremented,
+ * and this must be put once the bus is finished with.
+ *
+ * Because the association of a device_node and mii_bus is made via
+ * of_mdiobus_register(), the mii_bus cannot be found before it is
+ * registered with of_mdiobus_register().
+ *
+ */
+struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np)
+{
+	struct device *d;
+
+	if (!mdio_bus_np)
+		return NULL;
+
+	d = class_find_device_by_of_node(&mdio_bus_class, mdio_bus_np);
+	return d ? to_mii_bus(d) : NULL;
+}
+EXPORT_SYMBOL(of_mdio_find_bus);
+#endif
-- 
2.53.0

[PATCH net-next 4/5] net: phy: move registering mdio_bus_class and mdio_bus_type to libphy

[Heiner Kallweit]

The MDIO consumer side shouldn't register class and bus_type.
Therefore move this to libphy.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/net/phy/mdio_bus.c   | 23 -----------------------
 drivers/net/phy/phy_device.c | 13 +++++++++++++
 2 files changed, 13 insertions(+), 23 deletions(-)

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index c9a495390d2..9fb47332602 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -905,28 +905,5 @@ const struct bus_type mdio_bus_type = {
 };
 EXPORT_SYMBOL(mdio_bus_type);
 
-static int __init mdio_bus_init(void)
-{
-	int ret;
-
-	ret = class_register(&mdio_bus_class);
-	if (!ret) {
-		ret = bus_register(&mdio_bus_type);
-		if (ret)
-			class_unregister(&mdio_bus_class);
-	}
-
-	return ret;
-}
-
-static void __exit mdio_bus_exit(void)
-{
-	class_unregister(&mdio_bus_class);
-	bus_unregister(&mdio_bus_type);
-}
-
-subsys_initcall(mdio_bus_init);
-module_exit(mdio_bus_exit);
-
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("MDIO bus/device layer");
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index d1cbcfc3d2a..0edff47478c 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -3913,6 +3913,14 @@ static int __init phy_init(void)
 {
 	int rc;
 
+	rc = class_register(&mdio_bus_class);
+	if (rc)
+		return rc;
+
+	rc = bus_register(&mdio_bus_type);
+	if (rc)
+		goto err_class;
+
 	rtnl_lock();
 	ethtool_set_ethtool_phy_ops(&phy_ethtool_phy_ops);
 	phylib_register_stubs();
@@ -3941,6 +3949,9 @@ static int __init phy_init(void)
 	phylib_unregister_stubs();
 	ethtool_set_ethtool_phy_ops(NULL);
 	rtnl_unlock();
+	bus_unregister(&mdio_bus_type);
+err_class:
+	class_unregister(&mdio_bus_class);
 
 	return rc;
 }
@@ -3953,6 +3964,8 @@ static void __exit phy_exit(void)
 	phylib_unregister_stubs();
 	ethtool_set_ethtool_phy_ops(NULL);
 	rtnl_unlock();
+	bus_unregister(&mdio_bus_type);
+	class_unregister(&mdio_bus_class);
 }
 
 subsys_initcall(phy_init);
-- 
2.53.0

[PATCH net-next 5/5] net: phy: move remaining provider code to mdio_bus_provider.c

[Heiner Kallweit]

This moves definition of mdio_bus class and bus_type to the provider
side, what allows to make them private to libphy.
As a prerequisite MDIO statistics handling is moved to the
provider side as well.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/net/phy/mdio_bus.c          | 282 ----------------------------
 drivers/net/phy/mdio_bus_provider.c | 275 +++++++++++++++++++++++++++
 drivers/net/phy/phylib-internal.h   |   3 +
 include/linux/phy.h                 |   3 -
 4 files changed, 278 insertions(+), 285 deletions(-)

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 9fb47332602..00d0e4159e9 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -10,20 +10,14 @@
 
 #include <linux/device.h>
 #include <linux/errno.h>
-#include <linux/etherdevice.h>
 #include <linux/ethtool.h>
-#include <linux/gpio/consumer.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/mii.h>
 #include <linux/mm.h>
 #include <linux/module.h>
-#include <linux/netdevice.h>
-#include <linux/of_device.h>
-#include <linux/of_mdio.h>
 #include <linux/phy.h>
-#include <linux/reset.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/string.h>
@@ -64,218 +58,6 @@ bool mdiobus_is_registered_device(struct mii_bus *bus, int addr)
 }
 EXPORT_SYMBOL(mdiobus_is_registered_device);
 
-/**
- * mdiobus_release - mii_bus device release callback
- * @d: the target struct device that contains the mii_bus
- *
- * Description: called when the last reference to an mii_bus is
- * dropped, to free the underlying memory.
- */
-static void mdiobus_release(struct device *d)
-{
-	struct mii_bus *bus = to_mii_bus(d);
-
-	WARN(bus->state != MDIOBUS_RELEASED &&
-	     /* for compatibility with error handling in drivers */
-	     bus->state != MDIOBUS_ALLOCATED,
-	     "%s: not in RELEASED or ALLOCATED state\n",
-	     bus->id);
-
-	if (bus->state == MDIOBUS_RELEASED)
-		fwnode_handle_put(dev_fwnode(d));
-
-	kfree(bus);
-}
-
-struct mdio_bus_stat_attr {
-	struct device_attribute attr;
-	int address;
-	unsigned int field_offset;
-};
-
-static struct mdio_bus_stat_attr *to_sattr(struct device_attribute *attr)
-{
-	return container_of(attr, struct mdio_bus_stat_attr, attr);
-}
-
-static u64 mdio_bus_get_stat(struct mdio_bus_stats *s, unsigned int offset)
-{
-	const u64_stats_t *stats = (const void *)s + offset;
-	unsigned int start;
-	u64 val = 0;
-
-	do {
-		start = u64_stats_fetch_begin(&s->syncp);
-		val = u64_stats_read(stats);
-	} while (u64_stats_fetch_retry(&s->syncp, start));
-
-	return val;
-}
-
-static ssize_t mdio_bus_stat_field_show(struct device *dev,
-					struct device_attribute *attr,
-					char *buf)
-{
-	struct mdio_bus_stat_attr *sattr = to_sattr(attr);
-	struct mii_bus *bus = to_mii_bus(dev);
-	u64 val = 0;
-
-	if (sattr->address < 0) {
-		/* get global stats */
-		for (int i = 0; i < PHY_MAX_ADDR; i++)
-			val += mdio_bus_get_stat(&bus->stats[i],
-						 sattr->field_offset);
-	} else {
-		val = mdio_bus_get_stat(&bus->stats[sattr->address],
-					sattr->field_offset);
-	}
-
-	return sysfs_emit(buf, "%llu\n", val);
-}
-
-static ssize_t mdio_bus_device_stat_field_show(struct device *dev,
-					       struct device_attribute *attr,
-					       char *buf)
-{
-	struct mdio_bus_stat_attr *sattr = to_sattr(attr);
-	struct mdio_device *mdiodev = to_mdio_device(dev);
-	struct mii_bus *bus = mdiodev->bus;
-	int addr = mdiodev->addr;
-	u64 val;
-
-	val = mdio_bus_get_stat(&bus->stats[addr], sattr->field_offset);
-
-	return sysfs_emit(buf, "%llu\n", val);
-}
-
-#define MDIO_BUS_STATS_ATTR(field)					\
-static const struct mdio_bus_stat_attr dev_attr_mdio_bus_##field = {	\
-	.attr = __ATTR(field, 0444, mdio_bus_stat_field_show, NULL),	\
-	.address = -1,							\
-	.field_offset = offsetof(struct mdio_bus_stats, field),		\
-};									\
-static const struct mdio_bus_stat_attr dev_attr_mdio_bus_device_##field = { \
-	.attr = __ATTR(field, 0444, mdio_bus_device_stat_field_show, NULL), \
-	.field_offset = offsetof(struct mdio_bus_stats, field),		\
-}
-
-MDIO_BUS_STATS_ATTR(transfers);
-MDIO_BUS_STATS_ATTR(errors);
-MDIO_BUS_STATS_ATTR(writes);
-MDIO_BUS_STATS_ATTR(reads);
-
-#define MDIO_BUS_STATS_ADDR_ATTR_DECL(field, addr, file)		\
-static const struct mdio_bus_stat_attr					\
-dev_attr_mdio_bus_addr_##field##_##addr = {				\
-	.attr = { .attr = { .name = file, .mode = 0444 },		\
-		     .show = mdio_bus_stat_field_show,			\
-	},								\
-	.address = addr,						\
-	.field_offset = offsetof(struct mdio_bus_stats, field),		\
-}
-
-#define MDIO_BUS_STATS_ADDR_ATTR(field, addr)				\
-	MDIO_BUS_STATS_ADDR_ATTR_DECL(field, addr,			\
-				 __stringify(field) "_" __stringify(addr))
-
-#define MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(addr)			\
-	MDIO_BUS_STATS_ADDR_ATTR(transfers, addr);			\
-	MDIO_BUS_STATS_ADDR_ATTR(errors, addr);				\
-	MDIO_BUS_STATS_ADDR_ATTR(writes, addr);				\
-	MDIO_BUS_STATS_ADDR_ATTR(reads, addr)				\
-
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(0);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(1);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(2);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(3);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(4);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(5);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(6);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(7);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(8);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(9);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(10);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(11);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(12);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(13);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(14);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(15);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(16);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(17);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(18);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(19);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(20);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(21);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(22);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(23);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(24);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(25);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(26);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(27);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(28);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(29);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(30);
-MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(31);
-
-#define MDIO_BUS_STATS_ADDR_ATTR_GROUP(addr)				\
-	&dev_attr_mdio_bus_addr_transfers_##addr.attr.attr,		\
-	&dev_attr_mdio_bus_addr_errors_##addr.attr.attr,		\
-	&dev_attr_mdio_bus_addr_writes_##addr.attr.attr,		\
-	&dev_attr_mdio_bus_addr_reads_##addr.attr.attr			\
-
-static const struct attribute *const mdio_bus_statistics_attrs[] = {
-	&dev_attr_mdio_bus_transfers.attr.attr,
-	&dev_attr_mdio_bus_errors.attr.attr,
-	&dev_attr_mdio_bus_writes.attr.attr,
-	&dev_attr_mdio_bus_reads.attr.attr,
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(0),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(1),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(2),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(3),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(4),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(5),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(6),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(7),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(8),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(9),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(10),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(11),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(12),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(13),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(14),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(15),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(16),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(17),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(18),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(19),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(20),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(21),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(22),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(23),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(24),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(25),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(26),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(27),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(28),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(29),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(30),
-	MDIO_BUS_STATS_ADDR_ATTR_GROUP(31),
-	NULL,
-};
-
-static const struct attribute_group mdio_bus_statistics_group = {
-	.name		= "statistics",
-	.attrs_const	= mdio_bus_statistics_attrs,
-};
-__ATTRIBUTE_GROUPS(mdio_bus_statistics);
-
-const struct class mdio_bus_class = {
-	.name		= "mdio_bus",
-	.dev_release	= mdiobus_release,
-	.dev_groups	= mdio_bus_statistics_groups,
-};
-EXPORT_SYMBOL_GPL(mdio_bus_class);
-
 static void mdiobus_stats_acct(struct mdio_bus_stats *stats, bool op, int ret)
 {
 	preempt_disable();
@@ -841,69 +623,5 @@ int mdiobus_c45_modify_changed(struct mii_bus *bus, int addr, int devad,
 }
 EXPORT_SYMBOL_GPL(mdiobus_c45_modify_changed);
 
-/**
- * mdio_bus_match - determine if given MDIO driver supports the given
- *		    MDIO device
- * @dev: target MDIO device
- * @drv: given MDIO driver
- *
- * Return: 1 if the driver supports the device, 0 otherwise
- *
- * Description: This may require calling the devices own match function,
- *   since different classes of MDIO devices have different match criteria.
- */
-static int mdio_bus_match(struct device *dev, const struct device_driver *drv)
-{
-	const struct mdio_driver *mdiodrv = to_mdio_driver(drv);
-	struct mdio_device *mdio = to_mdio_device(dev);
-
-	/* Both the driver and device must type-match */
-	if (!(mdiodrv->mdiodrv.flags & MDIO_DEVICE_IS_PHY) !=
-	    !(mdio->flags & MDIO_DEVICE_FLAG_PHY))
-		return 0;
-
-	if (of_driver_match_device(dev, drv))
-		return 1;
-
-	if (mdio->bus_match)
-		return mdio->bus_match(dev, drv);
-
-	return 0;
-}
-
-static int mdio_uevent(const struct device *dev, struct kobj_uevent_env *env)
-{
-	int rc;
-
-	/* Some devices have extra OF data and an OF-style MODALIAS */
-	rc = of_device_uevent_modalias(dev, env);
-	if (rc != -ENODEV)
-		return rc;
-
-	return 0;
-}
-
-static const struct attribute *const mdio_bus_device_statistics_attrs[] = {
-	&dev_attr_mdio_bus_device_transfers.attr.attr,
-	&dev_attr_mdio_bus_device_errors.attr.attr,
-	&dev_attr_mdio_bus_device_writes.attr.attr,
-	&dev_attr_mdio_bus_device_reads.attr.attr,
-	NULL,
-};
-
-static const struct attribute_group mdio_bus_device_statistics_group = {
-	.name		= "statistics",
-	.attrs_const	= mdio_bus_device_statistics_attrs,
-};
-__ATTRIBUTE_GROUPS(mdio_bus_device_statistics);
-
-const struct bus_type mdio_bus_type = {
-	.name		= "mdio_bus",
-	.dev_groups	= mdio_bus_device_statistics_groups,
-	.match		= mdio_bus_match,
-	.uevent		= mdio_uevent,
-};
-EXPORT_SYMBOL(mdio_bus_type);
-
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("MDIO bus/device layer");
diff --git a/drivers/net/phy/mdio_bus_provider.c b/drivers/net/phy/mdio_bus_provider.c
index d50fe6eb4b0..bc0f10ba150 100644
--- a/drivers/net/phy/mdio_bus_provider.c
+++ b/drivers/net/phy/mdio_bus_provider.c
@@ -28,6 +28,281 @@
 #include <linux/string.h>
 #include <linux/uaccess.h>
 #include <linux/unistd.h>
+#include "phylib-internal.h"
+
+/**
+ * mdiobus_release - mii_bus device release callback
+ * @d: the target struct device that contains the mii_bus
+ *
+ * Description: called when the last reference to an mii_bus is
+ * dropped, to free the underlying memory.
+ */
+static void mdiobus_release(struct device *d)
+{
+	struct mii_bus *bus = to_mii_bus(d);
+
+	WARN(bus->state != MDIOBUS_RELEASED &&
+	     /* for compatibility with error handling in drivers */
+	     bus->state != MDIOBUS_ALLOCATED,
+	     "%s: not in RELEASED or ALLOCATED state\n",
+	     bus->id);
+
+	if (bus->state == MDIOBUS_RELEASED)
+		fwnode_handle_put(dev_fwnode(d));
+
+	kfree(bus);
+}
+
+struct mdio_bus_stat_attr {
+	struct device_attribute attr;
+	int address;
+	unsigned int field_offset;
+};
+
+static struct mdio_bus_stat_attr *to_sattr(struct device_attribute *attr)
+{
+	return container_of(attr, struct mdio_bus_stat_attr, attr);
+}
+
+static u64 mdio_bus_get_stat(struct mdio_bus_stats *s, unsigned int offset)
+{
+	const u64_stats_t *stats = (const void *)s + offset;
+	unsigned int start;
+	u64 val = 0;
+
+	do {
+		start = u64_stats_fetch_begin(&s->syncp);
+		val = u64_stats_read(stats);
+	} while (u64_stats_fetch_retry(&s->syncp, start));
+
+	return val;
+}
+
+static ssize_t mdio_bus_stat_field_show(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct mdio_bus_stat_attr *sattr = to_sattr(attr);
+	struct mii_bus *bus = to_mii_bus(dev);
+	u64 val = 0;
+
+	if (sattr->address < 0) {
+		/* get global stats */
+		for (int i = 0; i < PHY_MAX_ADDR; i++)
+			val += mdio_bus_get_stat(&bus->stats[i],
+						 sattr->field_offset);
+	} else {
+		val = mdio_bus_get_stat(&bus->stats[sattr->address],
+					sattr->field_offset);
+	}
+
+	return sysfs_emit(buf, "%llu\n", val);
+}
+
+static ssize_t mdio_bus_device_stat_field_show(struct device *dev,
+					       struct device_attribute *attr,
+					       char *buf)
+{
+	struct mdio_bus_stat_attr *sattr = to_sattr(attr);
+	struct mdio_device *mdiodev = to_mdio_device(dev);
+	struct mii_bus *bus = mdiodev->bus;
+	int addr = mdiodev->addr;
+	u64 val;
+
+	val = mdio_bus_get_stat(&bus->stats[addr], sattr->field_offset);
+
+	return sysfs_emit(buf, "%llu\n", val);
+}
+
+#define MDIO_BUS_STATS_ATTR(field)					\
+static const struct mdio_bus_stat_attr dev_attr_mdio_bus_##field = {	\
+	.attr = __ATTR(field, 0444, mdio_bus_stat_field_show, NULL),	\
+	.address = -1,							\
+	.field_offset = offsetof(struct mdio_bus_stats, field),		\
+};									\
+static const struct mdio_bus_stat_attr dev_attr_mdio_bus_device_##field = { \
+	.attr = __ATTR(field, 0444, mdio_bus_device_stat_field_show, NULL), \
+	.field_offset = offsetof(struct mdio_bus_stats, field),		\
+}
+
+MDIO_BUS_STATS_ATTR(transfers);
+MDIO_BUS_STATS_ATTR(errors);
+MDIO_BUS_STATS_ATTR(writes);
+MDIO_BUS_STATS_ATTR(reads);
+
+#define MDIO_BUS_STATS_ADDR_ATTR_DECL(field, addr, file)		\
+static const struct mdio_bus_stat_attr					\
+dev_attr_mdio_bus_addr_##field##_##addr = {				\
+	.attr = { .attr = { .name = file, .mode = 0444 },		\
+		     .show = mdio_bus_stat_field_show,			\
+	},								\
+	.address = addr,						\
+	.field_offset = offsetof(struct mdio_bus_stats, field),		\
+}
+
+#define MDIO_BUS_STATS_ADDR_ATTR(field, addr)				\
+	MDIO_BUS_STATS_ADDR_ATTR_DECL(field, addr,			\
+				 __stringify(field) "_" __stringify(addr))
+
+#define MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(addr)			\
+	MDIO_BUS_STATS_ADDR_ATTR(transfers, addr);			\
+	MDIO_BUS_STATS_ADDR_ATTR(errors, addr);				\
+	MDIO_BUS_STATS_ADDR_ATTR(writes, addr);				\
+	MDIO_BUS_STATS_ADDR_ATTR(reads, addr)				\
+
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(0);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(1);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(2);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(3);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(4);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(5);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(6);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(7);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(8);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(9);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(10);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(11);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(12);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(13);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(14);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(15);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(16);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(17);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(18);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(19);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(20);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(21);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(22);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(23);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(24);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(25);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(26);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(27);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(28);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(29);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(30);
+MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(31);
+
+#define MDIO_BUS_STATS_ADDR_ATTR_GROUP(addr)				\
+	&dev_attr_mdio_bus_addr_transfers_##addr.attr.attr,		\
+	&dev_attr_mdio_bus_addr_errors_##addr.attr.attr,		\
+	&dev_attr_mdio_bus_addr_writes_##addr.attr.attr,		\
+	&dev_attr_mdio_bus_addr_reads_##addr.attr.attr			\
+
+static const struct attribute *const mdio_bus_statistics_attrs[] = {
+	&dev_attr_mdio_bus_transfers.attr.attr,
+	&dev_attr_mdio_bus_errors.attr.attr,
+	&dev_attr_mdio_bus_writes.attr.attr,
+	&dev_attr_mdio_bus_reads.attr.attr,
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(0),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(1),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(2),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(3),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(4),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(5),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(6),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(7),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(8),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(9),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(10),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(11),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(12),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(13),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(14),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(15),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(16),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(17),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(18),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(19),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(20),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(21),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(22),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(23),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(24),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(25),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(26),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(27),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(28),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(29),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(30),
+	MDIO_BUS_STATS_ADDR_ATTR_GROUP(31),
+	NULL,
+};
+
+static const struct attribute_group mdio_bus_statistics_group = {
+	.name		= "statistics",
+	.attrs_const	= mdio_bus_statistics_attrs,
+};
+__ATTRIBUTE_GROUPS(mdio_bus_statistics);
+
+const struct class mdio_bus_class = {
+	.name		= "mdio_bus",
+	.dev_release	= mdiobus_release,
+	.dev_groups	= mdio_bus_statistics_groups,
+};
+
+/**
+ * mdio_bus_match - determine if given MDIO driver supports the given
+ *		    MDIO device
+ * @dev: target MDIO device
+ * @drv: given MDIO driver
+ *
+ * Return: 1 if the driver supports the device, 0 otherwise
+ *
+ * Description: This may require calling the devices own match function,
+ *   since different classes of MDIO devices have different match criteria.
+ */
+static int mdio_bus_match(struct device *dev, const struct device_driver *drv)
+{
+	const struct mdio_driver *mdiodrv = to_mdio_driver(drv);
+	struct mdio_device *mdio = to_mdio_device(dev);
+
+	/* Both the driver and device must type-match */
+	if (!(mdiodrv->mdiodrv.flags & MDIO_DEVICE_IS_PHY) !=
+	    !(mdio->flags & MDIO_DEVICE_FLAG_PHY))
+		return 0;
+
+	if (of_driver_match_device(dev, drv))
+		return 1;
+
+	if (mdio->bus_match)
+		return mdio->bus_match(dev, drv);
+
+	return 0;
+}
+
+static int mdio_uevent(const struct device *dev, struct kobj_uevent_env *env)
+{
+	int rc;
+
+	/* Some devices have extra OF data and an OF-style MODALIAS */
+	rc = of_device_uevent_modalias(dev, env);
+	if (rc != -ENODEV)
+		return rc;
+
+	return 0;
+}
+
+static const struct attribute *const mdio_bus_device_statistics_attrs[] = {
+	&dev_attr_mdio_bus_device_transfers.attr.attr,
+	&dev_attr_mdio_bus_device_errors.attr.attr,
+	&dev_attr_mdio_bus_device_writes.attr.attr,
+	&dev_attr_mdio_bus_device_reads.attr.attr,
+	NULL,
+};
+
+static const struct attribute_group mdio_bus_device_statistics_group = {
+	.name		= "statistics",
+	.attrs_const	= mdio_bus_device_statistics_attrs,
+};
+__ATTRIBUTE_GROUPS(mdio_bus_device_statistics);
+
+const struct bus_type mdio_bus_type = {
+	.name		= "mdio_bus",
+	.dev_groups	= mdio_bus_device_statistics_groups,
+	.match		= mdio_bus_match,
+	.uevent		= mdio_uevent,
+};
 
 /**
  * mdiobus_alloc_size - allocate a mii_bus structure
diff --git a/drivers/net/phy/phylib-internal.h b/drivers/net/phy/phylib-internal.h
index bfb1aa82386..664ed7faa51 100644
--- a/drivers/net/phy/phylib-internal.h
+++ b/drivers/net/phy/phylib-internal.h
@@ -9,6 +9,9 @@
 struct mdio_device;
 struct phy_device;
 
+extern const struct bus_type mdio_bus_type;
+extern const struct class mdio_bus_class;
+
 /*
  * phy_supported_speeds - return all speeds currently supported by a PHY device
  */
diff --git a/include/linux/phy.h b/include/linux/phy.h
index e9b0d7427b0..5de4b172cd0 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -2446,9 +2446,6 @@ int __phy_hwtstamp_set(struct phy_device *phydev,
 
 struct phy_port *phy_get_sfp_port(struct phy_device *phydev);
 
-extern const struct bus_type mdio_bus_type;
-extern const struct class mdio_bus_class;
-
 /**
  * phy_module_driver() - Helper macro for registering PHY drivers
  * @__phy_drivers: array of PHY drivers to register
-- 
2.53.0