[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / drivers / of / of_mdio.c

/*
 * OF helpers for the MDIO (Ethernet PHY) API
 *
 * Copyright (c) 2009 Secret Lab Technologies, Ltd.
 *
 * This file is released under the GPLv2
 *
 * This file provides helper functions for extracting PHY device information
 * out of the OpenFirmware device tree and using it to populate an mii_bus.
 */

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/netdevice.h>
#include <linux/err.h>
#include <linux/phy.h>
#include <linux/phy_fixed.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/of_irq.h>
#include <linux/of_mdio.h>
#include <linux/of_net.h>
#include <linux/module.h>

#define DEFAULT_GPIO_RESET_DELAY	10	/* in microseconds */

MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
MODULE_LICENSE("GPL");

/* Extract the clause 22 phy ID from the compatible string of the form
 * 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 int of_mdiobus_register_phy(struct mii_bus *mdio,
				    struct device_node *child, u32 addr)
{
	struct phy_device *phy;
	bool is_c45;
	int rc;
	u32 phy_id;

	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))
		return PTR_ERR(phy);

	rc = of_irq_get(child, 0);
	if (rc == -EPROBE_DEFER) {
		phy_device_free(phy);
		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;

	/* 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;

	/* All data is now stored in the phy struct;
	 * register it */
	rc = phy_device_register(phy);
	if (rc) {
		phy_device_free(phy);
		of_node_put(child);
		return rc;
	}

	dev_dbg(&mdio->dev, "registered phy %s at address %i\n",
		child->name, addr);
	return 0;
}

static int of_mdiobus_register_device(struct mii_bus *mdio,
				      struct device_node *child, u32 addr)
{
	struct mdio_device *mdiodev;
	int rc;

	mdiodev = mdio_device_create(mdio, addr);
	if (IS_ERR(mdiodev))
		return PTR_ERR(mdiodev);

	/* Associate the OF node with the device structure so it
	 * can be looked up later.
	 */
	of_node_get(child);
	mdiodev->dev.of_node = child;

	/* All data is now stored in the mdiodev struct; register it. */
	rc = mdio_device_register(mdiodev);
	if (rc) {
		mdio_device_free(mdiodev);
		of_node_put(child);
		return rc;
	}

	dev_dbg(&mdio->dev, "registered mdio device %s at address %i\n",
		child->name, addr);
	return 0;
}

/* The following is a list of PHY compatible strings which appear in
 * some DTBs. The compatible string is never matched against a PHY
 * driver, so is pointless. We only expect devices which are not PHYs
 * to have a compatible string, so they can be matched to an MDIO
 * driver.  Encourage users to upgrade their DT blobs to remove these.
 */
static const struct of_device_id whitelist_phys[] = {
	{ .compatible = "brcm,40nm-ephy" },
	{ .compatible = "broadcom,bcm5241" },
	{ .compatible = "marvell,88E1111", },
	{ .compatible = "marvell,88e1116", },
	{ .compatible = "marvell,88e1118", },
	{ .compatible = "marvell,88e1145", },
	{ .compatible = "marvell,88e1149r", },
	{ .compatible = "marvell,88e1310", },
	{ .compatible = "marvell,88E1510", },
	{ .compatible = "marvell,88E1514", },
	{ .compatible = "moxa,moxart-rtl8201cp", },
	{}
};

/*
 * Return true if the child node is for a phy. It must either:
 * o Compatible string of "ethernet-phy-idX.X"
 * o Compatible string of "ethernet-phy-ieee802.3-c45"
 * o Compatible string of "ethernet-phy-ieee802.3-c22"
 * o In the white list above (and issue a warning)
 * o No compatibility string
 *
 * A device which is not a phy is expected to have a compatible string
 * indicating what sort of device it is.
 */
static bool of_mdiobus_child_is_phy(struct device_node *child)
{
	u32 phy_id;

	if (of_get_phy_id(child, &phy_id) != -EINVAL)
		return true;

	if (of_device_is_compatible(child, "ethernet-phy-ieee802.3-c45"))
		return true;

	if (of_device_is_compatible(child, "ethernet-phy-ieee802.3-c22"))
		return true;

	if (of_match_node(whitelist_phys, child)) {
		pr_warn(FW_WARN
			"%pOF: Whitelisted compatible string. Please remove\n",
			child);
		return true;
	}

	if (!of_find_property(child, "compatible", NULL))
		return true;

	return false;
}

/**
 * of_mdiobus_register - Register mii_bus and create PHYs from the device tree
 * @mdio: pointer to mii_bus structure
 * @np: pointer to device_node of MDIO bus.
 *
 * This function registers the mii_bus structure and registers a phy_device
 * for each child node of @np.
 */
int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
{
	struct device_node *child;
	bool scanphys = false;
	int addr, rc;

	/* Do not continue if the node is disabled */
	if (!of_device_is_available(np))
		return -ENODEV;

	/* Mask out all PHYs from auto probing.  Instead the PHYs listed in
	 * the device tree are populated after the bus has been registered */
	mdio->phy_mask = ~0;

	mdio->dev.of_node = np;

	/* Get bus level PHY reset GPIO details */
	mdio->reset_delay_us = DEFAULT_GPIO_RESET_DELAY;
	of_property_read_u32(np, "reset-delay-us", &mdio->reset_delay_us);

	/* Register the MDIO bus */
	rc = mdiobus_register(mdio);
	if (rc)
		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)
			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))
			continue;

		for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
			/* skip already registered PHYs */
			if (mdiobus_is_registered_device(mdio, addr))
				continue;

			/* be noisy to encourage people to set reg property */
			dev_info(&mdio->dev, "scan phy %s at address %i\n",
				 child->name, addr);

			if (of_mdiobus_child_is_phy(child)) {
				rc = of_mdiobus_register_phy(mdio, child, addr);
				if (rc)
					goto unregister;
			}
		}
	}

	return 0;

unregister:
	mdiobus_unregister(mdio);
	return rc;
}
EXPORT_SYMBOL(of_mdiobus_register);

/* Helper function for of_phy_find_device */
static int of_phy_match(struct device *dev, void *phy_np)
{
	return dev->of_node == phy_np;
}

/**
 * of_phy_find_device - Give a PHY node, find the phy_device
 * @phy_np: Pointer to the phy's device tree node
 *
 * If successful, returns a pointer to the phy_device with the embedded
 * struct device refcount incremented by one, or NULL on failure.
 */
struct phy_device *of_phy_find_device(struct device_node *phy_np)
{
	struct device *d;
	struct mdio_device *mdiodev;

	if (!phy_np)
		return NULL;

	d = bus_find_device(&mdio_bus_type, NULL, phy_np, of_phy_match);
	if (d) {
		mdiodev = to_mdio_device(d);
		if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY)
			return to_phy_device(d);
		put_device(d);
	}

	return NULL;
}
EXPORT_SYMBOL(of_phy_find_device);

/**
 * of_phy_connect - Connect to the phy described in the device tree
 * @dev: pointer to net_device claiming the phy
 * @phy_np: Pointer to device tree node for the PHY
 * @hndlr: Link state callback for the network device
 * @flags: flags to pass to the PHY
 * @iface: PHY data interface type
 *
 * If successful, returns a pointer to the phy_device with the embedded
 * struct device refcount incremented by one, or NULL on failure. The
 * refcount must be dropped by calling phy_disconnect() or phy_detach().
 */
struct phy_device *of_phy_connect(struct net_device *dev,
				  struct device_node *phy_np,
				  void (*hndlr)(struct net_device *), u32 flags,
				  phy_interface_t iface)
{
	struct phy_device *phy = of_phy_find_device(phy_np);
	int ret;

	if (!phy)
		return NULL;

	phy->dev_flags = flags;

	ret = phy_connect_direct(dev, phy, hndlr, iface);

	/* refcount is held by phy_connect_direct() on success */
	put_device(&phy->mdio.dev);

	return ret ? NULL : phy;
}
EXPORT_SYMBOL(of_phy_connect);

/**
 * of_phy_get_and_connect
 * - Get phy node and connect to the phy described in the device tree
 * @dev: pointer to net_device claiming the phy
 * @np: Pointer to device tree node for the net_device claiming the phy
 * @hndlr: Link state callback for the network device
 *
 * If successful, returns a pointer to the phy_device with the embedded
 * struct device refcount incremented by one, or NULL on failure. The
 * refcount must be dropped by calling phy_disconnect() or phy_detach().
 */
struct phy_device *of_phy_get_and_connect(struct net_device *dev,
					  struct device_node *np,
					  void (*hndlr)(struct net_device *))
{
	phy_interface_t iface;
	struct device_node *phy_np;
	struct phy_device *phy;

	iface = of_get_phy_mode(np);
	if (iface < 0)
		return NULL;

	phy_np = of_parse_phandle(np, "phy-handle", 0);
	if (!phy_np)
		return NULL;

	phy = of_phy_connect(dev, phy_np, hndlr, 0, iface);

	of_node_put(phy_np);

	return phy;
}
EXPORT_SYMBOL(of_phy_get_and_connect);

/**
 * of_phy_attach - Attach to a PHY without starting the state machine
 * @dev: pointer to net_device claiming the phy
 * @phy_np: Node pointer for the PHY
 * @flags: flags to pass to the PHY
 * @iface: PHY data interface type
 *
 * If successful, returns a pointer to the phy_device with the embedded
 * struct device refcount incremented by one, or NULL on failure. The
 * refcount must be dropped by calling phy_disconnect() or phy_detach().
 */
struct phy_device *of_phy_attach(struct net_device *dev,
				 struct device_node *phy_np, u32 flags,
				 phy_interface_t iface)
{
	struct phy_device *phy = of_phy_find_device(phy_np);
	int ret;

	if (!phy)
		return NULL;

	ret = phy_attach_direct(dev, phy, flags, iface);

	/* refcount is held by phy_attach_direct() on success */
	put_device(&phy->mdio.dev);

	return ret ? NULL : phy;
}
EXPORT_SYMBOL(of_phy_attach);

/*
 * of_phy_is_fixed_link() and of_phy_register_fixed_link() must
 * support two DT bindings:
 * - the old DT binding, where 'fixed-link' was a property with 5
 *   cells encoding various informations about the fixed PHY
 * - the new DT binding, where 'fixed-link' is a sub-node of the
 *   Ethernet device.
 */
bool of_phy_is_fixed_link(struct device_node *np)
{
	struct device_node *dn;
	int len, err;
	const char *managed;

	/* New binding */
	dn = of_get_child_by_name(np, "fixed-link");
	if (dn) {
		of_node_put(dn);
		return true;
	}

	err = of_property_read_string(np, "managed", &managed);
	if (err == 0 && strcmp(managed, "auto") != 0)
		return true;

	/* Old binding */
	if (of_get_property(np, "fixed-link", &len) &&
	    len == (5 * sizeof(__be32)))
		return true;

	return false;
}
EXPORT_SYMBOL(of_phy_is_fixed_link);

int of_phy_register_fixed_link(struct device_node *np)
{
	struct fixed_phy_status status = {};
	struct device_node *fixed_link_node;
	u32 fixed_link_prop[5];
	const char *managed;
	int link_gpio = -1;

	if (of_property_read_string(np, "managed", &managed) == 0 &&
	    strcmp(managed, "in-band-status") == 0) {
		/* status is zeroed, namely its .link member */
		goto register_phy;
	}

	/* New binding */
	fixed_link_node = of_get_child_by_name(np, "fixed-link");
	if (fixed_link_node) {
		status.link = 1;
		status.duplex = of_property_read_bool(fixed_link_node,
						      "full-duplex");
		if (of_property_read_u32(fixed_link_node, "speed",
					 &status.speed)) {
			of_node_put(fixed_link_node);
			return -EINVAL;
		}
		status.pause = of_property_read_bool(fixed_link_node, "pause");
		status.asym_pause = of_property_read_bool(fixed_link_node,
							  "asym-pause");
		link_gpio = of_get_named_gpio_flags(fixed_link_node,
						    "link-gpios", 0, NULL);
		of_node_put(fixed_link_node);
		if (link_gpio == -EPROBE_DEFER)
			return -EPROBE_DEFER;

		goto register_phy;
	}

	/* Old binding */
	if (of_property_read_u32_array(np, "fixed-link", fixed_link_prop,
				       ARRAY_SIZE(fixed_link_prop)) == 0) {
		status.link = 1;
		status.duplex = fixed_link_prop[1];
		status.speed  = fixed_link_prop[2];
		status.pause  = fixed_link_prop[3];
		status.asym_pause = fixed_link_prop[4];
		goto register_phy;
	}

	return -ENODEV;

register_phy:
	return PTR_ERR_OR_ZERO(fixed_phy_register(PHY_POLL, &status, link_gpio,
						  np));
}
EXPORT_SYMBOL(of_phy_register_fixed_link);

void of_phy_deregister_fixed_link(struct device_node *np)
{
	struct phy_device *phydev;

	phydev = of_phy_find_device(np);
	if (!phydev)
		return;

	fixed_phy_unregister(phydev);

	put_device(&phydev->mdio.dev);	/* of_phy_find_device() */
	phy_device_free(phydev);	/* fixed_phy_register() */
}
EXPORT_SYMBOL(of_phy_deregister_fixed_link);
Commit	Line	Data
8bc487d1 GL	1	/*
	2	* OF helpers for the MDIO (Ethernet PHY) API
	3	*
	4	* Copyright (c) 2009 Secret Lab Technologies, Ltd.
	5	*
	6	* This file is released under the GPLv2
	7	*
	8	* This file provides helper functions for extracting PHY device information
	9	* out of the OpenFirmware device tree and using it to populate an mii_bus.
	10	*/
	11
24c30dbb AV	12	#include <linux/kernel.h>
	13	#include <linux/device.h>
	14	#include <linux/netdevice.h>
	15	#include <linux/err.h>
8bc487d1	16	#include <linux/phy.h>
3be2a49e	17	#include <linux/phy_fixed.h>
8bc487d1	18	#include <linux/of.h>
a5597008	19	#include <linux/of_gpio.h>
e3873444	20	#include <linux/of_irq.h>
8bc487d1	21	#include <linux/of_mdio.h>
b7862412	22	#include <linux/of_net.h>
8bc487d1 GL	23	#include <linux/module.h>
8bc487d1 GL	24
69226896 RQ	25	#define DEFAULT_GPIO_RESET_DELAY 10 /* in microseconds */
69226896 RQ	26
8bc487d1 GL	27	MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
	28	MODULE_LICENSE("GPL");
	29
3c6f5592 JG	30	/* Extract the clause 22 phy ID from the compatible string of the form
	31	* ethernet-phy-idAAAA.BBBB */
	32	static int of_get_phy_id(struct device_node device, u32 phy_id)
	33	{
	34	struct property *prop;
	35	const char *cp;
	36	unsigned int upper, lower;
	37
	38	of_property_for_each_string(device, "compatible", prop, cp) {
	39	if (sscanf(cp, "ethernet-phy-id%4x.%4x", &upper, &lower) == 2) {
	40	*phy_id = ((upper & 0xFFFF) << 16) \| (lower & 0xFFFF);
	41	return 0;
	42	}
	43	}
	44	return -EINVAL;
	45	}
	46
66bdede4	47	static int of_mdiobus_register_phy(struct mii_bus *mdio,
b520bd07	48	struct device_node *child, u32 addr)
2e79cb30 FF	49	{
	50	struct phy_device *phy;
	51	bool is_c45;
f15c586d	52	int rc;
3c6f5592	53	u32 phy_id;
2e79cb30 FF	54
	55	is_c45 = of_device_is_compatible(child,
	56	"ethernet-phy-ieee802.3-c45");
	57
3c6f5592 JG	58	if (!is_c45 && !of_get_phy_id(child, &phy_id))
	59	phy = phy_device_create(mdio, addr, phy_id, 0, NULL);
	60	else
	61	phy = get_phy_device(mdio, addr, is_c45);
af5840a9	62	if (IS_ERR(phy))
66bdede4	63	return PTR_ERR(phy);
2e79cb30	64
66bdede4 GU	65	rc = of_irq_get(child, 0);
	66	if (rc == -EPROBE_DEFER) {
	67	phy_device_free(phy);
	68	return rc;
	69	}
f15c586d BD	70	if (rc > 0) {
f15c586d BD	71	phy->irq = rc;
1bc16add	72	mdio->irq[addr] = rc;
f15c586d	73	} else {
1bc16add	74	phy->irq = mdio->irq[addr];
2e79cb30 FF	75	}
2e79cb30 FF	76
ab6016e0 FF	77	if (of_property_read_bool(child, "broken-turn-around"))
	78	mdio->phy_ignore_ta_mask \|= 1 << addr;
	79
2e79cb30 FF	80	/* Associate the OF node with the device structure so it
	81	* can be looked up later */
	82	of_node_get(child);
e5a03bfd	83	phy->mdio.dev.of_node = child;
2e79cb30 FF	84
	85	/* All data is now stored in the phy struct;
	86	* register it */
	87	rc = phy_device_register(phy);
	88	if (rc) {
	89	phy_device_free(phy);
	90	of_node_put(child);
66bdede4	91	return rc;
2e79cb30 FF	92	}
	93
	94	dev_dbg(&mdio->dev, "registered phy %s at address %i\n",
8fdade4b	95	child->name, addr);
66bdede4	96	return 0;
2e79cb30 FF	97	}
2e79cb30 FF	98
66bdede4 GU	99	static int of_mdiobus_register_device(struct mii_bus *mdio,
66bdede4 GU	100	struct device_node *child, u32 addr)
a9049e0c AL	101	{
	102	struct mdio_device *mdiodev;
	103	int rc;
	104
	105	mdiodev = mdio_device_create(mdio, addr);
a3478bae	106	if (IS_ERR(mdiodev))
66bdede4	107	return PTR_ERR(mdiodev);
a9049e0c AL	108
	109	/* Associate the OF node with the device structure so it
	110	* can be looked up later.
	111	*/
	112	of_node_get(child);
	113	mdiodev->dev.of_node = child;
	114
	115	/* All data is now stored in the mdiodev struct; register it. */
	116	rc = mdio_device_register(mdiodev);
	117	if (rc) {
	118	mdio_device_free(mdiodev);
	119	of_node_put(child);
66bdede4	120	return rc;
a9049e0c AL	121	}
	122
	123	dev_dbg(&mdio->dev, "registered mdio device %s at address %i\n",
	124	child->name, addr);
66bdede4	125	return 0;
a9049e0c AL	126	}
a9049e0c AL	127
ae461131 AL	128	/* The following is a list of PHY compatible strings which appear in
	129	* some DTBs. The compatible string is never matched against a PHY
	130	* driver, so is pointless. We only expect devices which are not PHYs
	131	* to have a compatible string, so they can be matched to an MDIO
	132	* driver. Encourage users to upgrade their DT blobs to remove these.
	133	*/
	134	static const struct of_device_id whitelist_phys[] = {
	135	{ .compatible = "brcm,40nm-ephy" },
7e1392fb	136	{ .compatible = "broadcom,bcm5241" },
ae461131 AL	137	{ .compatible = "marvell,88E1111", },
	138	{ .compatible = "marvell,88e1116", },
	139	{ .compatible = "marvell,88e1118", },
f5a952c0	140	{ .compatible = "marvell,88e1145", },
ae461131 AL	141	{ .compatible = "marvell,88e1149r", },
	142	{ .compatible = "marvell,88e1310", },
	143	{ .compatible = "marvell,88E1510", },
	144	{ .compatible = "marvell,88E1514", },
	145	{ .compatible = "moxa,moxart-rtl8201cp", },
	146	{}
	147	};
	148
801a8ef5 AL	149	/*
	150	* Return true if the child node is for a phy. It must either:
	151	* o Compatible string of "ethernet-phy-idX.X"
	152	* o Compatible string of "ethernet-phy-ieee802.3-c45"
	153	* o Compatible string of "ethernet-phy-ieee802.3-c22"
ae461131	154	* o In the white list above (and issue a warning)
801a8ef5 AL	155	* o No compatibility string
	156	*
	157	* A device which is not a phy is expected to have a compatible string
	158	* indicating what sort of device it is.
	159	*/
	160	static bool of_mdiobus_child_is_phy(struct device_node *child)
	161	{
	162	u32 phy_id;
	163
	164	if (of_get_phy_id(child, &phy_id) != -EINVAL)
	165	return true;
	166
	167	if (of_device_is_compatible(child, "ethernet-phy-ieee802.3-c45"))
	168	return true;
	169
	170	if (of_device_is_compatible(child, "ethernet-phy-ieee802.3-c22"))
	171	return true;
	172
ae461131 AL	173	if (of_match_node(whitelist_phys, child)) {
ae461131 AL	174	pr_warn(FW_WARN
0d638a07 RH	175	"%pOF: Whitelisted compatible string. Please remove\n",
0d638a07 RH	176	child);
ae461131 AL	177	return true;
	178	}
	179
801a8ef5 AL	180	if (!of_find_property(child, "compatible", NULL))
	181	return true;
	182
	183	return false;
	184	}
	185
8bc487d1 GL	186	/**
	187	* of_mdiobus_register - Register mii_bus and create PHYs from the device tree
	188	* @mdio: pointer to mii_bus structure
	189	* @np: pointer to device_node of MDIO bus.
	190	*
	191	* This function registers the mii_bus structure and registers a phy_device
	192	* for each child node of @np.
	193	*/
	194	int of_mdiobus_register(struct mii_bus mdio, struct device_node np)
	195	{
8bc487d1	196	struct device_node *child;
2e79cb30	197	bool scanphys = false;
e7f4dc35	198	int addr, rc;
8bc487d1	199
a77f4f70 FF	200	/* Do not continue if the node is disabled */
	201	if (!of_device_is_available(np))
	202	return -ENODEV;
	203
8bc487d1 GL	204	/* Mask out all PHYs from auto probing. Instead the PHYs listed in
	205	* the device tree are populated after the bus has been registered */
	206	mdio->phy_mask = ~0;
	207
25106022 DD	208	mdio->dev.of_node = np;
25106022 DD	209
69226896 RQ	210	/* Get bus level PHY reset GPIO details */
	211	mdio->reset_delay_us = DEFAULT_GPIO_RESET_DELAY;
	212	of_property_read_u32(np, "reset-delay-us", &mdio->reset_delay_us);
69226896	213
8bc487d1 GL	214	/* Register the MDIO bus */
	215	rc = mdiobus_register(mdio);
	216	if (rc)
	217	return rc;
	218
801a8ef5	219	/* Loop over the child nodes and register a phy_device for each phy */
e207e761	220	for_each_available_child_of_node(np, child) {
8f838288 DM	221	addr = of_mdio_parse_addr(&mdio->dev, child);
8f838288 DM	222	if (addr < 0) {
779d835e	223	scanphys = true;
19458860 DD	224	continue;
	225	}
	226
801a8ef5	227	if (of_mdiobus_child_is_phy(child))
66bdede4	228	rc = of_mdiobus_register_phy(mdio, child, addr);
a9049e0c	229	else
66bdede4 GU	230	rc = of_mdiobus_register_device(mdio, child, addr);
	231	if (rc)
	232	goto unregister;
8bc487d1 GL	233	}
8bc487d1 GL	234
779d835e SH	235	if (!scanphys)
	236	return 0;
	237
	238	/* auto scan for PHYs with empty reg property */
	239	for_each_available_child_of_node(np, child) {
	240	/* Skip PHYs with reg property set */
2fca6d28	241	if (of_find_property(child, "reg", NULL))
779d835e SH	242	continue;
779d835e SH	243
779d835e SH	244	for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
779d835e SH	245	/* skip already registered PHYs */
7f854420	246	if (mdiobus_is_registered_device(mdio, addr))
779d835e SH	247	continue;
	248
	249	/* be noisy to encourage people to set reg property */
	250	dev_info(&mdio->dev, "scan phy %s at address %i\n",
	251	child->name, addr);
	252
66bdede4 GU	253	if (of_mdiobus_child_is_phy(child)) {
	254	rc = of_mdiobus_register_phy(mdio, child, addr);
	255	if (rc)
	256	goto unregister;
	257	}
779d835e SH	258	}
	259	}
	260
8bc487d1	261	return 0;
66bdede4 GU	262
	263	unregister:
	264	mdiobus_unregister(mdio);
	265	return rc;
8bc487d1 GL	266	}
	267	EXPORT_SYMBOL(of_mdiobus_register);
	268
08a7963a JP	269	/* Helper function for of_phy_find_device */
	270	static int of_phy_match(struct device dev, void phy_np)
	271	{
61c7a080	272	return dev->of_node == phy_np;
08a7963a JP	273	}
08a7963a JP	274
8bc487d1 GL	275	/**
	276	* of_phy_find_device - Give a PHY node, find the phy_device
	277	* @phy_np: Pointer to the phy's device tree node
	278	*
f018ae7a RK	279	* If successful, returns a pointer to the phy_device with the embedded
f018ae7a RK	280	* struct device refcount incremented by one, or NULL on failure.
8bc487d1 GL	281	*/
	282	struct phy_device of_phy_find_device(struct device_node phy_np)
	283	{
	284	struct device *d;
6ed74236 AL	285	struct mdio_device *mdiodev;
6ed74236 AL	286
8bc487d1 GL	287	if (!phy_np)
	288	return NULL;
	289
08a7963a	290	d = bus_find_device(&mdio_bus_type, NULL, phy_np, of_phy_match);
6ed74236 AL	291	if (d) {
	292	mdiodev = to_mdio_device(d);
	293	if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY)
	294	return to_phy_device(d);
3ae30f4c	295	put_device(d);
6ed74236 AL	296	}
	297
	298	return NULL;
8bc487d1 GL	299	}
	300	EXPORT_SYMBOL(of_phy_find_device);
	301
	302	/**
	303	* of_phy_connect - Connect to the phy described in the device tree
	304	* @dev: pointer to net_device claiming the phy
	305	* @phy_np: Pointer to device tree node for the PHY
	306	* @hndlr: Link state callback for the network device
735c1e25	307	* @flags: flags to pass to the PHY
8bc487d1 GL	308	* @iface: PHY data interface type
8bc487d1 GL	309	*
f018ae7a RK	310	* If successful, returns a pointer to the phy_device with the embedded
	311	* struct device refcount incremented by one, or NULL on failure. The
	312	* refcount must be dropped by calling phy_disconnect() or phy_detach().
8bc487d1 GL	313	*/
	314	struct phy_device of_phy_connect(struct net_device dev,
	315	struct device_node *phy_np,
	316	void (hndlr)(struct net_device ), u32 flags,
	317	phy_interface_t iface)
	318	{
	319	struct phy_device *phy = of_phy_find_device(phy_np);
f018ae7a	320	int ret;
8bc487d1 GL	321
	322	if (!phy)
	323	return NULL;
	324
2f637151 FF	325	phy->dev_flags = flags;
2f637151 FF	326
f018ae7a RK	327	ret = phy_connect_direct(dev, phy, hndlr, iface);
	328
	329	/* refcount is held by phy_connect_direct() on success */
e5a03bfd	330	put_device(&phy->mdio.dev);
f018ae7a RK	331
f018ae7a RK	332	return ret ? NULL : phy;
8bc487d1 GL	333	}
8bc487d1 GL	334	EXPORT_SYMBOL(of_phy_connect);
24c30dbb	335
b7862412 DL	336	/**
	337	* of_phy_get_and_connect
	338	* - Get phy node and connect to the phy described in the device tree
	339	* @dev: pointer to net_device claiming the phy
	340	* @np: Pointer to device tree node for the net_device claiming the phy
	341	* @hndlr: Link state callback for the network device
	342	*
	343	* If successful, returns a pointer to the phy_device with the embedded
	344	* struct device refcount incremented by one, or NULL on failure. The
	345	* refcount must be dropped by calling phy_disconnect() or phy_detach().
	346	*/
	347	struct phy_device of_phy_get_and_connect(struct net_device dev,
	348	struct device_node *np,
	349	void (hndlr)(struct net_device ))
	350	{
	351	phy_interface_t iface;
	352	struct device_node *phy_np;
	353	struct phy_device *phy;
	354
	355	iface = of_get_phy_mode(np);
	356	if (iface < 0)
	357	return NULL;
	358
	359	phy_np = of_parse_phandle(np, "phy-handle", 0);
	360	if (!phy_np)
	361	return NULL;
	362
	363	phy = of_phy_connect(dev, phy_np, hndlr, 0, iface);
	364
	365	of_node_put(phy_np);
	366
	367	return phy;
	368	}
	369	EXPORT_SYMBOL(of_phy_get_and_connect);
	370
7614aba6 AF	371	/**
	372	* of_phy_attach - Attach to a PHY without starting the state machine
	373	* @dev: pointer to net_device claiming the phy
	374	* @phy_np: Node pointer for the PHY
	375	* @flags: flags to pass to the PHY
	376	* @iface: PHY data interface type
f018ae7a RK	377	*
	378	* If successful, returns a pointer to the phy_device with the embedded
	379	* struct device refcount incremented by one, or NULL on failure. The
	380	* refcount must be dropped by calling phy_disconnect() or phy_detach().
7614aba6 AF	381	*/
	382	struct phy_device of_phy_attach(struct net_device dev,
	383	struct device_node *phy_np, u32 flags,
	384	phy_interface_t iface)
	385	{
	386	struct phy_device *phy = of_phy_find_device(phy_np);
f018ae7a	387	int ret;
7614aba6 AF	388
	389	if (!phy)
	390	return NULL;
	391
f018ae7a RK	392	ret = phy_attach_direct(dev, phy, flags, iface);
	393
	394	/* refcount is held by phy_attach_direct() on success */
e5a03bfd	395	put_device(&phy->mdio.dev);
f018ae7a RK	396
f018ae7a RK	397	return ret ? NULL : phy;
7614aba6 AF	398	}
7614aba6 AF	399	EXPORT_SYMBOL(of_phy_attach);
3be2a49e	400
3be2a49e TP	401	/*
	402	* of_phy_is_fixed_link() and of_phy_register_fixed_link() must
	403	* support two DT bindings:
	404	* - the old DT binding, where 'fixed-link' was a property with 5
	405	* cells encoding various informations about the fixed PHY
	406	* - the new DT binding, where 'fixed-link' is a sub-node of the
	407	* Ethernet device.
	408	*/
	409	bool of_phy_is_fixed_link(struct device_node *np)
	410	{
	411	struct device_node *dn;
4cba5c21 SS	412	int len, err;
4cba5c21 SS	413	const char *managed;
3be2a49e TP	414
	415	/* New binding */
	416	dn = of_get_child_by_name(np, "fixed-link");
	417	if (dn) {
	418	of_node_put(dn);
	419	return true;
	420	}
	421
4cba5c21 SS	422	err = of_property_read_string(np, "managed", &managed);
	423	if (err == 0 && strcmp(managed, "auto") != 0)
	424	return true;
	425
3be2a49e TP	426	/* Old binding */
	427	if (of_get_property(np, "fixed-link", &len) &&
	428	len == (5 * sizeof(__be32)))
	429	return true;
	430
	431	return false;
	432	}
	433	EXPORT_SYMBOL(of_phy_is_fixed_link);
	434
	435	int of_phy_register_fixed_link(struct device_node *np)
	436	{
	437	struct fixed_phy_status status = {};
	438	struct device_node *fixed_link_node;
d226a2b8	439	u32 fixed_link_prop[5];
4cba5c21	440	const char *managed;
5a7a8346	441	int link_gpio = -1;
4cba5c21	442
5a7a8346 SS	443	if (of_property_read_string(np, "managed", &managed) == 0 &&
	444	strcmp(managed, "in-band-status") == 0) {
	445	/* status is zeroed, namely its .link member */
	446	goto register_phy;
4cba5c21	447	}
3be2a49e TP	448
	449	/* New binding */
	450	fixed_link_node = of_get_child_by_name(np, "fixed-link");
	451	if (fixed_link_node) {
	452	status.link = 1;
a72e1541 RR	453	status.duplex = of_property_read_bool(fixed_link_node,
a72e1541 RR	454	"full-duplex");
48c1699d JH	455	if (of_property_read_u32(fixed_link_node, "speed",
	456	&status.speed)) {
	457	of_node_put(fixed_link_node);
3be2a49e	458	return -EINVAL;
48c1699d	459	}
a72e1541 RR	460	status.pause = of_property_read_bool(fixed_link_node, "pause");
	461	status.asym_pause = of_property_read_bool(fixed_link_node,
	462	"asym-pause");
a5597008 AL	463	link_gpio = of_get_named_gpio_flags(fixed_link_node,
a5597008 AL	464	"link-gpios", 0, NULL);
3be2a49e	465	of_node_put(fixed_link_node);
a5597008 AL	466	if (link_gpio == -EPROBE_DEFER)
	467	return -EPROBE_DEFER;
	468
5a7a8346	469	goto register_phy;
3be2a49e TP	470	}
	471
	472	/* Old binding */
d226a2b8 SS	473	if (of_property_read_u32_array(np, "fixed-link", fixed_link_prop,
d226a2b8 SS	474	ARRAY_SIZE(fixed_link_prop)) == 0) {
3be2a49e	475	status.link = 1;
d226a2b8 SS	476	status.duplex = fixed_link_prop[1];
	477	status.speed = fixed_link_prop[2];
	478	status.pause = fixed_link_prop[3];
	479	status.asym_pause = fixed_link_prop[4];
5a7a8346	480	goto register_phy;
3be2a49e TP	481	}
	482
	483	return -ENODEV;
5a7a8346 SS	484
	485	register_phy:
	486	return PTR_ERR_OR_ZERO(fixed_phy_register(PHY_POLL, &status, link_gpio,
	487	np));
3be2a49e TP	488	}
3be2a49e TP	489	EXPORT_SYMBOL(of_phy_register_fixed_link);
3f65047c JH	490
	491	void of_phy_deregister_fixed_link(struct device_node *np)
	492	{
	493	struct phy_device *phydev;
	494
	495	phydev = of_phy_find_device(np);
	496	if (!phydev)
	497	return;
	498
	499	fixed_phy_unregister(phydev);
	500
	501	put_device(&phydev->mdio.dev); /* of_phy_find_device() */
	502	phy_device_free(phydev); /* fixed_phy_register() */
	503	}
	504	EXPORT_SYMBOL(of_phy_deregister_fixed_link);