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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/drivers/net/phy/fixed_phy.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0+
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 /*
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  * Fixed MDIO bus (MDIO bus emulation with fixed PHYs)
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  *
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..
@@ -5,11 +6,6 @@
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  *         Anton Vorontsov <avorontsov@ru.mvista.com>
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  *
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  * Copyright (c) 2006-2007 MontaVista Software, Inc.
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- *
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- * This program is free software; you can redistribute  it and/or modify it
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- * under  the terms of  the GNU General  Public License as published by the
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- * Free Software Foundation;  either version 2 of the  License, or (at your
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- * option) any later version.
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  */
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10
 
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 #include <linux/kernel.h>
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@@ -22,8 +18,10 @@
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 #include <linux/err.h>
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 #include <linux/slab.h>
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 #include <linux/of.h>
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-#include <linux/gpio.h>
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+#include <linux/gpio/consumer.h>
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 #include <linux/idr.h>
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+#include <linux/netdevice.h>
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+#include <linux/linkmode.h>
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25
 
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 #include "swphy.h"
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27
 
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@@ -36,9 +34,10 @@
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 	int addr;
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 	struct phy_device *phydev;
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 	struct fixed_phy_status status;
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+	bool no_carrier;
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 	int (*link_update)(struct net_device *, struct fixed_phy_status *);
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 	struct list_head node;
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-	int link_gpio;
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+	struct gpio_desc *link_gpiod;
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 };
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42
 
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 static struct platform_device *pdev;
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@@ -46,10 +45,29 @@
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 	.phys = LIST_HEAD_INIT(platform_fmb.phys),
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 };
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47
 
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+int fixed_phy_change_carrier(struct net_device *dev, bool new_carrier)
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+{
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+	struct fixed_mdio_bus *fmb = &platform_fmb;
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+	struct phy_device *phydev = dev->phydev;
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+	struct fixed_phy *fp;
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+
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+	if (!phydev || !phydev->mdio.bus)
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+		return -EINVAL;
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+
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+	list_for_each_entry(fp, &fmb->phys, node) {
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+		if (fp->addr == phydev->mdio.addr) {
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+			fp->no_carrier = !new_carrier;
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+			return 0;
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+		}
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+	}
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+	return -EINVAL;
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+}
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+EXPORT_SYMBOL_GPL(fixed_phy_change_carrier);
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+
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 static void fixed_phy_update(struct fixed_phy *fp)
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 {
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-	if (gpio_is_valid(fp->link_gpio))
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-		fp->status.link = !!gpio_get_value_cansleep(fp->link_gpio);
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+	if (!fp->no_carrier && fp->link_gpiod)
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+		fp->status.link = !!gpiod_get_value_cansleep(fp->link_gpiod);
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 }
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72
 
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 static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
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@@ -60,6 +78,8 @@
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 	list_for_each_entry(fp, &fmb->phys, node) {
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 		if (fp->addr == phy_addr) {
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 			struct fixed_phy_status state;
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+
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+			fp->status.link = !fp->no_carrier;
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83
 
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 			/* Issue callback if user registered it. */
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 			if (fp->link_update)
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@@ -110,9 +130,9 @@
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 }
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 EXPORT_SYMBOL_GPL(fixed_phy_set_link_update);
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132
 
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-int fixed_phy_add(unsigned int irq, int phy_addr,
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-		  struct fixed_phy_status *status,
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-		  int link_gpio)
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+static int fixed_phy_add_gpiod(unsigned int irq, int phy_addr,
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+			       struct fixed_phy_status *status,
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+			       struct gpio_desc *gpiod)
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 {
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 	int ret;
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 	struct fixed_mdio_bus *fmb = &platform_fmb;
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@@ -131,24 +151,19 @@
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151
 
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 	fp->addr = phy_addr;
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 	fp->status = *status;
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-	fp->link_gpio = link_gpio;
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-
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-	if (gpio_is_valid(fp->link_gpio)) {
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-		ret = gpio_request_one(fp->link_gpio, GPIOF_DIR_IN,
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-				       "fixed-link-gpio-link");
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-		if (ret)
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-			goto err_regs;
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-	}
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+	fp->link_gpiod = gpiod;
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 	fixed_phy_update(fp);
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 	list_add_tail(&fp->node, &fmb->phys);
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159
 
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 	return 0;
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+}
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162
 
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-err_regs:
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-	kfree(fp);
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-	return ret;
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+int fixed_phy_add(unsigned int irq, int phy_addr,
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+		  struct fixed_phy_status *status) {
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+
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+	return fixed_phy_add_gpiod(irq, phy_addr, status, NULL);
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167
 }
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 EXPORT_SYMBOL_GPL(fixed_phy_add);
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169
 
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@@ -162,8 +177,8 @@
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 	list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
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 		if (fp->addr == phy_addr) {
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 			list_del(&fp->node);
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-			if (gpio_is_valid(fp->link_gpio))
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-				gpio_free(fp->link_gpio);
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+			if (fp->link_gpiod)
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+				gpiod_put(fp->link_gpiod);
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 			kfree(fp);
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 			ida_simple_remove(&phy_fixed_ida, phy_addr);
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 			return;
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@@ -171,10 +186,47 @@
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186
 	}
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 }
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188
 
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-struct phy_device *fixed_phy_register(unsigned int irq,
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-				      struct fixed_phy_status *status,
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-				      int link_gpio,
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-				      struct device_node *np)
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+#ifdef CONFIG_OF_GPIO
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+static struct gpio_desc *fixed_phy_get_gpiod(struct device_node *np)
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+{
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+	struct device_node *fixed_link_node;
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+	struct gpio_desc *gpiod;
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+
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+	if (!np)
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+		return NULL;
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+
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+	fixed_link_node = of_get_child_by_name(np, "fixed-link");
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+	if (!fixed_link_node)
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+		return NULL;
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+
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+	/*
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+	 * As the fixed link is just a device tree node without any
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+	 * Linux device associated with it, we simply have obtain
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+	 * the GPIO descriptor from the device tree like this.
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+	 */
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+	gpiod = fwnode_gpiod_get_index(of_fwnode_handle(fixed_link_node),
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+				       "link", 0, GPIOD_IN, "mdio");
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+	if (IS_ERR(gpiod) && PTR_ERR(gpiod) != -EPROBE_DEFER) {
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+		if (PTR_ERR(gpiod) != -ENOENT)
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+			pr_err("error getting GPIO for fixed link %pOF, proceed without\n",
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+			       fixed_link_node);
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+		gpiod = NULL;
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+	}
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+	of_node_put(fixed_link_node);
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+
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+	return gpiod;
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+}
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+#else
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+static struct gpio_desc *fixed_phy_get_gpiod(struct device_node *np)
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+{
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+	return NULL;
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+}
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+#endif
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+
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+static struct phy_device *__fixed_phy_register(unsigned int irq,
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+					       struct fixed_phy_status *status,
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+					       struct device_node *np,
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+					       struct gpio_desc *gpiod)
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 {
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231
 	struct fixed_mdio_bus *fmb = &platform_fmb;
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 	struct phy_device *phy;
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@@ -184,12 +236,19 @@
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 	if (!fmb->mii_bus || fmb->mii_bus->state != MDIOBUS_REGISTERED)
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 		return ERR_PTR(-EPROBE_DEFER);
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238
 
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+	/* Check if we have a GPIO associated with this fixed phy */
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+	if (!gpiod) {
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+		gpiod = fixed_phy_get_gpiod(np);
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+		if (IS_ERR(gpiod))
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+			return ERR_CAST(gpiod);
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+	}
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+
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 	/* Get the next available PHY address, up to PHY_MAX_ADDR */
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 	phy_addr = ida_simple_get(&phy_fixed_ida, 0, PHY_MAX_ADDR, GFP_KERNEL);
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 	if (phy_addr < 0)
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 		return ERR_PTR(phy_addr);
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-	ret = fixed_phy_add(irq, phy_addr, status, link_gpio);
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+	ret = fixed_phy_add_gpiod(irq, phy_addr, status, gpiod);
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 	if (ret < 0) {
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 		ida_simple_remove(&phy_fixed_ida, phy_addr);
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 		return ERR_PTR(ret);
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@@ -216,15 +275,26 @@
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 	switch (status->speed) {
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 	case SPEED_1000:
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-		phy->supported = PHY_1000BT_FEATURES;
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-		break;
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+		linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
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+				 phy->supported);
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+		linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
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+				 phy->supported);
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+		fallthrough;
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 	case SPEED_100:
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-		phy->supported = PHY_100BT_FEATURES;
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-		break;
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+		linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
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+				 phy->supported);
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+		linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
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+				 phy->supported);
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+		fallthrough;
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 	case SPEED_10:
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 	default:
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-		phy->supported = PHY_10BT_FEATURES;
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+		linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT,
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+				 phy->supported);
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+		linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT,
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+				 phy->supported);
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 	}
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+
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+	phy_advertise_supported(phy);
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298
 
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 	ret = phy_device_register(phy);
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 	if (ret) {
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@@ -236,8 +306,24 @@
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 	return phy;
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 }
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+
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+struct phy_device *fixed_phy_register(unsigned int irq,
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+				      struct fixed_phy_status *status,
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+				      struct device_node *np)
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+{
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+	return __fixed_phy_register(irq, status, np, NULL);
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+}
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 EXPORT_SYMBOL_GPL(fixed_phy_register);
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317
 
318
+struct phy_device *
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+fixed_phy_register_with_gpiod(unsigned int irq,
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+			      struct fixed_phy_status *status,
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+			      struct gpio_desc *gpiod)
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+{
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+	return __fixed_phy_register(irq, status, NULL, gpiod);
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+}
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+EXPORT_SYMBOL_GPL(fixed_phy_register_with_gpiod);
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+
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 void fixed_phy_unregister(struct phy_device *phy)
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328
 {
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 	phy_device_remove(phy);