6 files changed, 229 insertions, 135 deletions

diff --git a/drivers/net/mdio/Kconfig b/drivers/net/mdio/Kconfig
index d06e06f5e31a..99a6c13a11af 100644
--- a/drivers/net/mdio/Kconfig
+++ b/drivers/net/mdio/Kconfig
@@ -19,6 +19,13 @@ config MDIO_BUS
 	  reflects whether the mdio_bus/mdio_device code is built as a
 	  loadable module or built-in.
 
+config FWNODE_MDIO
+	def_tristate PHYLIB
+	depends on (ACPI || OF) || COMPILE_TEST
+	select FIXED_PHY
+	help
+	  FWNODE MDIO bus (Ethernet PHY) accessors
+
 config OF_MDIO
 	def_tristate PHYLIB
 	depends on OF
@@ -27,6 +34,13 @@ config OF_MDIO
 	help
 	  OpenFirmware MDIO bus (Ethernet PHY) accessors
 
+config ACPI_MDIO
+	def_tristate PHYLIB
+	depends on ACPI
+	depends on PHYLIB
+	help
+	  ACPI MDIO bus (Ethernet PHY) accessors
+
 if MDIO_BUS
 
 config MDIO_DEVRES
diff --git a/drivers/net/mdio/Makefile b/drivers/net/mdio/Makefile
index c3ec0ef989df..15f8dc4042ce 100644
--- a/drivers/net/mdio/Makefile
+++ b/drivers/net/mdio/Makefile
@@ -1,7 +1,9 @@
 # SPDX-License-Identifier: GPL-2.0
 # Makefile for Linux MDIO bus drivers
 
-obj-$(CONFIG_OF_MDIO)	+= of_mdio.o
+obj-$(CONFIG_ACPI_MDIO)		+= acpi_mdio.o
+obj-$(CONFIG_FWNODE_MDIO)	+= fwnode_mdio.o
+obj-$(CONFIG_OF_MDIO)		+= of_mdio.o
 
 obj-$(CONFIG_MDIO_ASPEED)		+= mdio-aspeed.o
 obj-$(CONFIG_MDIO_BCM_IPROC)		+= mdio-bcm-iproc.o
diff --git a/drivers/net/mdio/acpi_mdio.c b/drivers/net/mdio/acpi_mdio.c
new file mode 100644
index 000000000000..d77c987fda9c
--- /dev/null
+++ b/drivers/net/mdio/acpi_mdio.c
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ACPI helpers for the MDIO (Ethernet PHY) API
+ *
+ * This file provides helper functions for extracting PHY device information
+ * out of the ACPI ASL and using it to populate an mii_bus.
+ */
+
+#include <linux/acpi.h>
+#include <linux/acpi_mdio.h>
+#include <linux/bits.h>
+#include <linux/dev_printk.h>
+#include <linux/fwnode_mdio.h>
+#include <linux/module.h>
+#include <linux/types.h>
+
+MODULE_AUTHOR("Calvin Johnson <calvin.johnson@oss.nxp.com>");
+MODULE_LICENSE("GPL");
+
+/**
+ * acpi_mdiobus_register - Register mii_bus and create PHYs from the ACPI ASL.
+ * @mdio: pointer to mii_bus structure
+ * @fwnode: pointer to fwnode of MDIO bus. This fwnode is expected to represent
+ * an ACPI device object corresponding to the MDIO bus and its children are
+ * expected to correspond to the PHY devices on that bus.
+ *
+ * This function registers the mii_bus structure and registers a phy_device
+ * for each child node of @fwnode.
+ */
+int acpi_mdiobus_register(struct mii_bus *mdio, struct fwnode_handle *fwnode)
+{
+	struct fwnode_handle *child;
+	u32 addr;
+	int ret;
+
+	/* Mask out all PHYs from auto probing. */
+	mdio->phy_mask = GENMASK(31, 0);
+	ret = mdiobus_register(mdio);
+	if (ret)
+		return ret;
+
+	ACPI_COMPANION_SET(&mdio->dev, to_acpi_device_node(fwnode));
+
+	/* Loop over the child nodes and register a phy_device for each PHY */
+	fwnode_for_each_child_node(fwnode, child) {
+		ret = acpi_get_local_address(ACPI_HANDLE_FWNODE(child), &addr);
+		if (ret || addr >= PHY_MAX_ADDR)
+			continue;
+
+		ret = fwnode_mdiobus_register_phy(mdio, child, addr);
+		if (ret == -ENODEV)
+			dev_err(&mdio->dev,
+				"MDIO device at address %d is missing.\n",
+				addr);
+	}
+	return 0;
+}
+EXPORT_SYMBOL(acpi_mdiobus_register);
diff --git a/drivers/net/mdio/fwnode_mdio.c b/drivers/net/mdio/fwnode_mdio.c
new file mode 100644
index 000000000000..e96766da8de4
--- /dev/null
+++ b/drivers/net/mdio/fwnode_mdio.c
@@ -0,0 +1,144 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * fwnode helpers for the MDIO (Ethernet PHY) API
+ *
+ * This file provides helper functions for extracting PHY device information
+ * out of the fwnode and using it to populate an mii_bus.
+ */
+
+#include <linux/acpi.h>
+#include <linux/fwnode_mdio.h>
+#include <linux/of.h>
+#include <linux/phy.h>
+
+MODULE_AUTHOR("Calvin Johnson <calvin.johnson@oss.nxp.com>");
+MODULE_LICENSE("GPL");
+
+static struct mii_timestamper *
+fwnode_find_mii_timestamper(struct fwnode_handle *fwnode)
+{
+	struct of_phandle_args arg;
+	int err;
+
+	if (is_acpi_node(fwnode))
+		return NULL;
+
+	err = of_parse_phandle_with_fixed_args(to_of_node(fwnode),
+					       "timestamper", 1, 0, &arg);
+	if (err == -ENOENT)
+		return NULL;
+	else if (err)
+		return ERR_PTR(err);
+
+	if (arg.args_count != 1)
+		return ERR_PTR(-EINVAL);
+
+	return register_mii_timestamper(arg.np, arg.args[0]);
+}
+
+int fwnode_mdiobus_phy_device_register(struct mii_bus *mdio,
+				       struct phy_device *phy,
+				       struct fwnode_handle *child, u32 addr)
+{
+	int rc;
+
+	rc = fwnode_irq_get(child, 0);
+	if (rc == -EPROBE_DEFER)
+		return rc;
+
+	if (rc > 0) {
+		phy->irq = rc;
+		mdio->irq[addr] = rc;
+	} else {
+		phy->irq = mdio->irq[addr];
+	}
+
+	if (fwnode_property_read_bool(child, "broken-turn-around"))
+		mdio->phy_ignore_ta_mask |= 1 << addr;
+
+	fwnode_property_read_u32(child, "reset-assert-us",
+				 &phy->mdio.reset_assert_delay);
+	fwnode_property_read_u32(child, "reset-deassert-us",
+				 &phy->mdio.reset_deassert_delay);
+
+	/* Associate the fwnode with the device structure so it
+	 * can be looked up later
+	 */
+	fwnode_handle_get(child);
+	phy->mdio.dev.fwnode = child;
+
+	/* All data is now stored in the phy struct;
+	 * register it
+	 */
+	rc = phy_device_register(phy);
+	if (rc) {
+		fwnode_handle_put(child);
+		return rc;
+	}
+
+	dev_dbg(&mdio->dev, "registered phy %p fwnode at address %i\n",
+		child, addr);
+	return 0;
+}
+EXPORT_SYMBOL(fwnode_mdiobus_phy_device_register);
+
+int fwnode_mdiobus_register_phy(struct mii_bus *bus,
+				struct fwnode_handle *child, u32 addr)
+{
+	struct mii_timestamper *mii_ts = NULL;
+	struct phy_device *phy;
+	bool is_c45 = false;
+	u32 phy_id;
+	int rc;
+
+	mii_ts = fwnode_find_mii_timestamper(child);
+	if (IS_ERR(mii_ts))
+		return PTR_ERR(mii_ts);
+
+	rc = fwnode_property_match_string(child, "compatible",
+					  "ethernet-phy-ieee802.3-c45");
+	if (rc >= 0)
+		is_c45 = true;
+
+	if (is_c45 || fwnode_get_phy_id(child, &phy_id))
+		phy = get_phy_device(bus, addr, is_c45);
+	else
+		phy = phy_device_create(bus, addr, phy_id, 0, NULL);
+	if (IS_ERR(phy)) {
+		unregister_mii_timestamper(mii_ts);
+		return PTR_ERR(phy);
+	}
+
+	if (is_acpi_node(child)) {
+		phy->irq = bus->irq[addr];
+
+		/* Associate the fwnode with the device structure so it
+		 * can be looked up later.
+		 */
+		phy->mdio.dev.fwnode = child;
+
+		/* All data is now stored in the phy struct, so register it */
+		rc = phy_device_register(phy);
+		if (rc) {
+			phy_device_free(phy);
+			fwnode_handle_put(phy->mdio.dev.fwnode);
+			return rc;
+		}
+	} else if (is_of_node(child)) {
+		rc = fwnode_mdiobus_phy_device_register(bus, phy, child, addr);
+		if (rc) {
+			unregister_mii_timestamper(mii_ts);
+			phy_device_free(phy);
+			return rc;
+		}
+	}
+
+	/* phy->mii_ts may already be defined by the PHY driver. A
+	 * mii_timestamper probed via the device tree will still have
+	 * precedence.
+	 */
+	if (mii_ts)
+		phy->mii_ts = mii_ts;
+	return 0;
+}
+EXPORT_SYMBOL(fwnode_mdiobus_register_phy);
diff --git a/drivers/net/mdio/mdio-mscc-miim.c b/drivers/net/mdio/mdio-mscc-miim.c
index b36e5ea04ddf..2d67e12c8262 100644
--- a/drivers/net/mdio/mdio-mscc-miim.c
+++ b/drivers/net/mdio/mdio-mscc-miim.c
@@ -139,10 +139,6 @@ static int mscc_miim_probe(struct platform_device *pdev)
 	struct mscc_miim_dev *dev;
 	int ret;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res)
-		return -ENODEV;
-
 	bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*dev));
 	if (!bus)
 		return -ENOMEM;
@@ -155,7 +151,7 @@ static int mscc_miim_probe(struct platform_device *pdev)
 	bus->parent = &pdev->dev;
 
 	dev = bus->priv;
-	dev->regs = devm_ioremap_resource(&pdev->dev, res);
+	dev->regs = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
 	if (IS_ERR(dev->regs)) {
 		dev_err(&pdev->dev, "Unable to map MIIM registers\n");
 		return PTR_ERR(dev->regs);
diff --git a/drivers/net/mdio/of_mdio.c b/drivers/net/mdio/of_mdio.c
index 8e97d5b825f5..8744b1e1c2b1 100644
--- a/drivers/net/mdio/of_mdio.c
+++ b/drivers/net/mdio/of_mdio.c
@@ -10,6 +10,7 @@
 
 #include <linux/device.h>
 #include <linux/err.h>
+#include <linux/fwnode_mdio.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
@@ -29,123 +30,22 @@ MODULE_LICENSE("GPL");
  * ethernet-phy-idAAAA.BBBB */
 static int of_get_phy_id(struct device_node *device, u32 *phy_id)
 {
-	struct property *prop;
-	const char *cp;
-	unsigned int upper, lower;
-
-	of_property_for_each_string(device, "compatible", prop, cp) {
-		if (sscanf(cp, "ethernet-phy-id%4x.%4x", &upper, &lower) == 2) {
-			*phy_id = ((upper & 0xFFFF) << 16) | (lower & 0xFFFF);
-			return 0;
-		}
-	}
-	return -EINVAL;
-}
-
-static struct mii_timestamper *of_find_mii_timestamper(struct device_node *node)
-{
-	struct of_phandle_args arg;
-	int err;
-
-	err = of_parse_phandle_with_fixed_args(node, "timestamper", 1, 0, &arg);
-
-	if (err == -ENOENT)
-		return NULL;
-	else if (err)
-		return ERR_PTR(err);
-
-	if (arg.args_count != 1)
-		return ERR_PTR(-EINVAL);
-
-	return register_mii_timestamper(arg.np, arg.args[0]);
+	return fwnode_get_phy_id(of_fwnode_handle(device), phy_id);
 }
 
 int of_mdiobus_phy_device_register(struct mii_bus *mdio, struct phy_device *phy,
-			      struct device_node *child, u32 addr)
+				   struct device_node *child, u32 addr)
 {
-	int rc;
-
-	rc = of_irq_get(child, 0);
-	if (rc == -EPROBE_DEFER)
-		return rc;
-
-	if (rc > 0) {
-		phy->irq = rc;
-		mdio->irq[addr] = rc;
-	} else {
-		phy->irq = mdio->irq[addr];
-	}
-
-	if (of_property_read_bool(child, "broken-turn-around"))
-		mdio->phy_ignore_ta_mask |= 1 << addr;
-
-	of_property_read_u32(child, "reset-assert-us",
-			     &phy->mdio.reset_assert_delay);
-	of_property_read_u32(child, "reset-deassert-us",
-			     &phy->mdio.reset_deassert_delay);
-
-	/* Associate the OF node with the device structure so it
-	 * can be looked up later */
-	of_node_get(child);
-	phy->mdio.dev.of_node = child;
-	phy->mdio.dev.fwnode = of_fwnode_handle(child);
-
-	/* All data is now stored in the phy struct;
-	 * register it */
-	rc = phy_device_register(phy);
-	if (rc) {
-		of_node_put(child);
-		return rc;
-	}
-
-	dev_dbg(&mdio->dev, "registered phy %pOFn at address %i\n",
-		child, addr);
-	return 0;
+	return fwnode_mdiobus_phy_device_register(mdio, phy,
+						  of_fwnode_handle(child),
+						  addr);
 }
 EXPORT_SYMBOL(of_mdiobus_phy_device_register);
 
 static int of_mdiobus_register_phy(struct mii_bus *mdio,
 				    struct device_node *child, u32 addr)
 {
-	struct mii_timestamper *mii_ts;
-	struct phy_device *phy;
-	bool is_c45;
-	int rc;
-	u32 phy_id;
-
-	mii_ts = of_find_mii_timestamper(child);
-	if (IS_ERR(mii_ts))
-		return PTR_ERR(mii_ts);
-
-	is_c45 = of_device_is_compatible(child,
-					 "ethernet-phy-ieee802.3-c45");
-
-	if (!is_c45 && !of_get_phy_id(child, &phy_id))
-		phy = phy_device_create(mdio, addr, phy_id, 0, NULL);
-	else
-		phy = get_phy_device(mdio, addr, is_c45);
-	if (IS_ERR(phy)) {
-		if (mii_ts)
-			unregister_mii_timestamper(mii_ts);
-		return PTR_ERR(phy);
-	}
-
-	rc = of_mdiobus_phy_device_register(mdio, phy, child, addr);
-	if (rc) {
-		if (mii_ts)
-			unregister_mii_timestamper(mii_ts);
-		phy_device_free(phy);
-		return rc;
-	}
-
-	/* phy->mii_ts may already be defined by the PHY driver. A
-	 * mii_timestamper probed via the device tree will still have
-	 * precedence.
-	 */
-	if (mii_ts)
-		phy->mii_ts = mii_ts;
-
-	return 0;
+	return fwnode_mdiobus_register_phy(mdio, of_fwnode_handle(child), addr);
 }
 
 static int of_mdiobus_register_device(struct mii_bus *mdio,
@@ -347,16 +247,7 @@ EXPORT_SYMBOL(of_mdiobus_register);
  */
 struct mdio_device *of_mdio_find_device(struct device_node *np)
 {
-	struct device *d;
-
-	if (!np)
-		return NULL;
-
-	d = bus_find_device_by_of_node(&mdio_bus_type, np);
-	if (!d)
-		return NULL;
-
-	return to_mdio_device(d);
+	return fwnode_mdio_find_device(of_fwnode_handle(np));
 }
 EXPORT_SYMBOL(of_mdio_find_device);
 
@@ -369,18 +260,7 @@ EXPORT_SYMBOL(of_mdio_find_device);
  */
 struct phy_device *of_phy_find_device(struct device_node *phy_np)
 {
-	struct mdio_device *mdiodev;
-
-	mdiodev = of_mdio_find_device(phy_np);
-	if (!mdiodev)
-		return NULL;
-
-	if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY)
-		return to_phy_device(&mdiodev->dev);
-
-	put_device(&mdiodev->dev);
-
-	return NULL;
+	return fwnode_phy_find_device(of_fwnode_handle(phy_np));
 }
 EXPORT_SYMBOL(of_phy_find_device);