Merge: CNB95: phy: update to v6.8

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/4561

JIRA: https://issues.redhat.com/browse/RHEL-33716

Signed-off-by: Izabela Bakollari <ibakolla@redhat.com>

Approved-by: Andrew Halaney <ahalaney@redhat.com>
Approved-by: Ivan Vecera <ivecera@redhat.com>
Approved-by: Petr Oros <poros@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: Lucas Zampieri <lzampier@redhat.com>

Author: zampierilucas

Documentation/networking/phy.rst

@@ -120,7 +120,7 @@ required delays, as defined per the RGMII standard, several options may be
 available:
 
 * Some SoCs may offer a pin pad/mux/controller capable of configuring a given
-  set of pins'strength, delays, and voltage; and it may be a suitable
+  set of pins' strength, delays, and voltage; and it may be a suitable
   option to insert the expected 2ns RGMII delay.
 
 * Modifying the PCB design to include a fixed delay (e.g: using a specifically

MAINTAINERS

@@ -11841,6 +11841,13 @@ F:	Documentation/devicetree/bindings/net/ieee802154/mcr20a.txt
 F:	drivers/net/ieee802154/mcr20a.c
 F:	drivers/net/ieee802154/mcr20a.h
 
+MDIO REGMAP DRIVER
+M:	Maxime Chevallier <maxime.chevallier@bootlin.com>
+L:	netdev@vger.kernel.org
+S:	Maintained
+F:	drivers/net/mdio/mdio-regmap.c
+F:	include/linux/mdio/mdio-regmap.h
+
 MEASUREMENT COMPUTING CIO-DAC IIO DRIVER
 M:	William Breathitt Gray <vilhelm.gray@gmail.com>
 L:	linux-iio@vger.kernel.org
@@ -13867,7 +13874,7 @@ NXP C45 TJA11XX PHY DRIVER
 M:	Radu Pirea <radu-nicolae.pirea@oss.nxp.com>
 L:	netdev@vger.kernel.org
 S:	Maintained
-F:	drivers/net/phy/nxp-c45-tja11xx.c
+F:	drivers/net/phy/nxp-c45-tja11xx*
 
 NXP FSPI DRIVER
 M:	Ashish Kumar <ashish.kumar@nxp.com>

drivers/net/mdio/Kconfig

@@ -181,6 +181,17 @@ config MDIO_IPQ8064
 	  This driver supports the MDIO interface found in the network
 	  interface units of the IPQ8064 SoC
 
+config MDIO_REGMAP
+	tristate
+	help
+	  This driver allows using MDIO devices that are not sitting on a
+	  regular MDIO bus, but still exposes the standard 802.3 register
+	  layout. It's regmap-based so that it can be used on integrated,
+	  memory-mapped PHYs, SPI PHYs and so on. A new virtual MDIO bus is
+	  created, and its read/write operations are mapped to the underlying
+	  regmap. Users willing to use this driver must explicitly select
+	  REGMAP.
+
 config MDIO_THUNDER
 	tristate "ThunderX SOCs MDIO buses"
 	depends on 64BIT

drivers/net/mdio/Makefile

@@ -19,6 +19,7 @@ obj-$(CONFIG_MDIO_MOXART)		+= mdio-moxart.o
 obj-$(CONFIG_MDIO_MSCC_MIIM)		+= mdio-mscc-miim.o
 obj-$(CONFIG_MDIO_MVUSB)		+= mdio-mvusb.o
 obj-$(CONFIG_MDIO_OCTEON)		+= mdio-octeon.o
+obj-$(CONFIG_MDIO_REGMAP)		+= mdio-regmap.o
 obj-$(CONFIG_MDIO_SUN4I)		+= mdio-sun4i.o
 obj-$(CONFIG_MDIO_THUNDER)		+= mdio-thunder.o
 obj-$(CONFIG_MDIO_XGENE)		+= mdio-xgene.o

drivers/net/mdio/acpi_mdio.c

@@ -16,26 +16,29 @@
 
 MODULE_AUTHOR("Calvin Johnson <calvin.johnson@oss.nxp.com>");
 MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("ACPI MDIO bus (Ethernet PHY) accessors");
 
 /**
- * acpi_mdiobus_register - Register mii_bus and create PHYs from the ACPI ASL.
+ * __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
+ * @owner: module owning this @mdio object.
  * 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)
+int __acpi_mdiobus_register(struct mii_bus *mdio, struct fwnode_handle *fwnode,
+			    struct module *owner)
 {
 	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);
+	ret = __mdiobus_register(mdio, owner);
 	if (ret)
 		return ret;
 
@@ -55,4 +58,4 @@ int acpi_mdiobus_register(struct mii_bus *mdio, struct fwnode_handle *fwnode)
 	}
 	return 0;
 }
-EXPORT_SYMBOL(acpi_mdiobus_register);
+EXPORT_SYMBOL(__acpi_mdiobus_register);

drivers/net/mdio/fwnode_mdio.c

@@ -14,6 +14,7 @@
 
 MODULE_AUTHOR("Calvin Johnson <calvin.johnson@oss.nxp.com>");
 MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("FWNODE MDIO bus (Ethernet PHY) accessors");
 
 static struct pse_control *
 fwnode_find_pse_control(struct fwnode_handle *fwnode)

drivers/net/mdio/mdio-aspeed.c

@@ -155,3 +155,4 @@ module_platform_driver(aspeed_mdio_driver);
 
 MODULE_AUTHOR("Andrew Jeffery <andrew@aj.id.au>");
 MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("ASPEED MDIO bus controller");

drivers/net/mdio/mdio-bitbang.c

@@ -263,3 +263,4 @@ void free_mdio_bitbang(struct mii_bus *bus)
 EXPORT_SYMBOL(free_mdio_bitbang);
 
 MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Bitbanged MDIO buses");

drivers/net/mdio/mdio-regmap.c

@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Driver for MMIO-Mapped MDIO devices. Some IPs expose internal PHYs or PCS
+ * within the MMIO-mapped area
+ *
+ * Copyright (C) 2023 Maxime Chevallier <maxime.chevallier@bootlin.com>
+ */
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/mdio.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_mdio.h>
+#include <linux/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/mdio/mdio-regmap.h>
+
+#define DRV_NAME "mdio-regmap"
+
+struct mdio_regmap_priv {
+	struct regmap *regmap;
+	u8 valid_addr;
+};
+
+static int mdio_regmap_read_c22(struct mii_bus *bus, int addr, int regnum)
+{
+	struct mdio_regmap_priv *ctx = bus->priv;
+	unsigned int val;
+	int ret;
+
+	if (ctx->valid_addr != addr)
+		return -ENODEV;
+
+	ret = regmap_read(ctx->regmap, regnum, &val);
+	if (ret < 0)
+		return ret;
+
+	return val;
+}
+
+static int mdio_regmap_write_c22(struct mii_bus *bus, int addr, int regnum,
+				 u16 val)
+{
+	struct mdio_regmap_priv *ctx = bus->priv;
+
+	if (ctx->valid_addr != addr)
+		return -ENODEV;
+
+	return regmap_write(ctx->regmap, regnum, val);
+}
+
+struct mii_bus *devm_mdio_regmap_register(struct device *dev,
+					  const struct mdio_regmap_config *config)
+{
+	struct mdio_regmap_priv *mr;
+	struct mii_bus *mii;
+	int rc;
+
+	if (!config->parent)
+		return ERR_PTR(-EINVAL);
+
+	mii = devm_mdiobus_alloc_size(config->parent, sizeof(*mr));
+	if (!mii)
+		return ERR_PTR(-ENOMEM);
+
+	mr = mii->priv;
+	mr->regmap = config->regmap;
+	mr->valid_addr = config->valid_addr;
+
+	mii->name = DRV_NAME;
+	strscpy(mii->id, config->name, MII_BUS_ID_SIZE);
+	mii->parent = config->parent;
+	mii->read = mdio_regmap_read_c22;
+	mii->write = mdio_regmap_write_c22;
+
+	if (config->autoscan)
+		mii->phy_mask = ~BIT(config->valid_addr);
+	else
+		mii->phy_mask = ~0;
+
+	rc = devm_mdiobus_register(dev, mii);
+	if (rc) {
+		dev_err(config->parent, "Cannot register MDIO bus![%s] (%d)\n", mii->id, rc);
+		return ERR_PTR(rc);
+	}
+
+	return mii;
+}
+EXPORT_SYMBOL_GPL(devm_mdio_regmap_register);
+
+MODULE_DESCRIPTION("MDIO API over regmap");
+MODULE_AUTHOR("Maxime Chevallier <maxime.chevallier@bootlin.com>");
+MODULE_LICENSE("GPL");

drivers/net/mdio/of_mdio.c

@@ -25,6 +25,7 @@
 
 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
 MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("OpenFirmware MDIO bus (Ethernet PHY) accessors");
 
 /* Extract the clause 22 phy ID from the compatible string of the form
  * ethernet-phy-idAAAA.BBBB */
@@ -131,13 +132,60 @@ bool of_mdiobus_child_is_phy(struct device_node *child)
 		return true;
 	}
 
-	if (!of_find_property(child, "compatible", NULL))
+	if (!of_property_present(child, "compatible"))
 		return true;
 
 	return false;
 }
 EXPORT_SYMBOL(of_mdiobus_child_is_phy);
 
+static int __of_mdiobus_parse_phys(struct mii_bus *mdio, struct device_node *np,
+				   bool *scanphys)
+{
+	struct device_node *child;
+	int addr, rc = 0;
+
+	/* Loop over the child nodes and register a phy_device for each phy */
+	for_each_available_child_of_node(np, child) {
+		if (of_node_name_eq(child, "ethernet-phy-package")) {
+			/* Ignore invalid ethernet-phy-package node */
+			if (!of_property_present(child, "reg"))
+				continue;
+
+			rc = __of_mdiobus_parse_phys(mdio, child, NULL);
+			if (rc && rc != -ENODEV)
+				goto exit;
+
+			continue;
+		}
+
+		addr = of_mdio_parse_addr(&mdio->dev, child);
+		if (addr < 0) {
+			/* Skip scanning for invalid ethernet-phy-package node */
+			if (scanphys)
+				*scanphys = true;
+			continue;
+		}
+
+		if (of_mdiobus_child_is_phy(child))
+			rc = of_mdiobus_register_phy(mdio, child, addr);
+		else
+			rc = of_mdiobus_register_device(mdio, child, addr);
+
+		if (rc == -ENODEV)
+			dev_err(&mdio->dev,
+				"MDIO device at address %d is missing.\n",
+				addr);
+		else if (rc)
+			goto exit;
+	}
+
+	return 0;
+exit:
+	of_node_put(child);
+	return rc;
+}
+
 /**
  * __of_mdiobus_register - Register mii_bus and create PHYs from the device tree
  * @mdio: pointer to mii_bus structure
@@ -179,33 +227,18 @@ int __of_mdiobus_register(struct mii_bus *mdio, struct device_node *np,
 		return rc;
 
 	/* Loop over the child nodes and register a phy_device for each phy */
-	for_each_available_child_of_node(np, child) {
-		addr = of_mdio_parse_addr(&mdio->dev, child);
-		if (addr < 0) {
-			scanphys = true;
-			continue;
-		}
-
-		if (of_mdiobus_child_is_phy(child))
-			rc = of_mdiobus_register_phy(mdio, child, addr);
-		else
-			rc = of_mdiobus_register_device(mdio, child, addr);
-
-		if (rc == -ENODEV)
-			dev_err(&mdio->dev,
-				"MDIO device at address %d is missing.\n",
-				addr);
-		else if (rc)
-			goto unregister;
-	}
+	rc = __of_mdiobus_parse_phys(mdio, np, &scanphys);
+	if (rc)
+		goto unregister;
 
 	if (!scanphys)
 		return 0;
 
 	/* auto scan for PHYs with empty reg property */
 	for_each_available_child_of_node(np, child) {
-		/* Skip PHYs with reg property set */
-		if (of_find_property(child, "reg", NULL))
+		/* Skip PHYs with reg property set or ethernet-phy-package node */
+		if (of_property_present(child, "reg") ||
+		    of_node_name_eq(child, "ethernet-phy-package"))
 			continue;
 
 		for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
@@ -226,13 +259,15 @@ int __of_mdiobus_register(struct mii_bus *mdio, struct device_node *np,
 				if (!rc)
 					break;
 				if (rc != -ENODEV)
-					goto unregister;
+					goto put_unregister;
 			}
 		}
 	}
 
 	return 0;
 
+put_unregister:
+	of_node_put(child);
 unregister:
 	mdiobus_unregister(mdio);
 	return rc;