[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/module.h>

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 void 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;

	rc = irq_of_parse_and_map(child, 0);
	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;
	}

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

static void 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;

	/* 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;
	}

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

int of_mdio_parse_addr(struct device *dev, const struct device_node *np)
{
	u32 addr;
	int ret;

	ret = of_property_read_u32(np, "reg", &addr);
	if (ret < 0) {
		dev_err(dev, "%s has invalid PHY address\n", np->full_name);
		return ret;
	}

	/* A PHY must have a reg property in the range [0-31] */
	if (addr >= PHY_MAX_ADDR) {
		dev_err(dev, "%s PHY address %i is too large\n",
			np->full_name, addr);
		return -EINVAL;
	}

	return addr;
}
EXPORT_SYMBOL(of_mdio_parse_addr);

/* 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 = "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
			"%s: Whitelisted compatible string. Please remove\n",
			child->full_name);
		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;

	/* 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;

	/* 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))
			of_mdiobus_register_phy(mdio, child, addr);
		else
			of_mdiobus_register_device(mdio, child, addr);
	}

	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))
				of_mdiobus_register_phy(mdio, child, addr);
		}
	}

	return 0;
}
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);
	}

	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_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);

#if defined(CONFIG_FIXED_PHY)
/*
 * 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;
	const __be32 *fixed_link_prop;
	int link_gpio;
	int len, err;
	struct phy_device *phy;
	const char *managed;

	err = of_property_read_string(np, "managed", &managed);
	if (err == 0) {
		if (strcmp(managed, "in-band-status") == 0) {
			/* status is zeroed, namely its .link member */
			phy = fixed_phy_register(PHY_POLL, &status, -1, np);
			return PTR_ERR_OR_ZERO(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))
			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;

		phy = fixed_phy_register(PHY_POLL, &status, link_gpio, np);
		return PTR_ERR_OR_ZERO(phy);
	}

	/* Old binding */
	fixed_link_prop = of_get_property(np, "fixed-link", &len);
	if (fixed_link_prop && len == (5 * sizeof(__be32))) {
		status.link = 1;
		status.duplex = be32_to_cpu(fixed_link_prop[1]);
		status.speed = be32_to_cpu(fixed_link_prop[2]);
		status.pause = be32_to_cpu(fixed_link_prop[3]);
		status.asym_pause = be32_to_cpu(fixed_link_prop[4]);
		phy = fixed_phy_register(PHY_POLL, &status, -1, np);
		return PTR_ERR_OR_ZERO(phy);
	}

	return -ENODEV;
}
EXPORT_SYMBOL(of_phy_register_fixed_link);
#endif
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 GL	21	#include <linux/of_mdio.h>
	22	#include <linux/module.h>
	23
	24	MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
	25	MODULE_LICENSE("GPL");
	26
3c6f5592 JG	27	/* Extract the clause 22 phy ID from the compatible string of the form
	28	* ethernet-phy-idAAAA.BBBB */
	29	static int of_get_phy_id(struct device_node device, u32 phy_id)
	30	{
	31	struct property *prop;
	32	const char *cp;
	33	unsigned int upper, lower;
	34
	35	of_property_for_each_string(device, "compatible", prop, cp) {
	36	if (sscanf(cp, "ethernet-phy-id%4x.%4x", &upper, &lower) == 2) {
	37	*phy_id = ((upper & 0xFFFF) << 16) \| (lower & 0xFFFF);
	38	return 0;
	39	}
	40	}
	41	return -EINVAL;
	42	}
	43
b520bd07 SS	44	static void of_mdiobus_register_phy(struct mii_bus *mdio,
b520bd07 SS	45	struct device_node *child, u32 addr)
2e79cb30 FF	46	{
	47	struct phy_device *phy;
	48	bool is_c45;
f15c586d	49	int rc;
3c6f5592	50	u32 phy_id;
2e79cb30 FF	51
	52	is_c45 = of_device_is_compatible(child,
	53	"ethernet-phy-ieee802.3-c45");
	54
3c6f5592 JG	55	if (!is_c45 && !of_get_phy_id(child, &phy_id))
	56	phy = phy_device_create(mdio, addr, phy_id, 0, NULL);
	57	else
	58	phy = get_phy_device(mdio, addr, is_c45);
af5840a9	59	if (IS_ERR(phy))
b520bd07	60	return;
2e79cb30	61
f15c586d BD	62	rc = irq_of_parse_and_map(child, 0);
	63	if (rc > 0) {
	64	phy->irq = rc;
1bc16add	65	mdio->irq[addr] = rc;
f15c586d	66	} else {
1bc16add	67	phy->irq = mdio->irq[addr];
2e79cb30 FF	68	}
2e79cb30 FF	69
ab6016e0 FF	70	if (of_property_read_bool(child, "broken-turn-around"))
	71	mdio->phy_ignore_ta_mask \|= 1 << addr;
	72
2e79cb30 FF	73	/* Associate the OF node with the device structure so it
	74	* can be looked up later */
	75	of_node_get(child);
e5a03bfd	76	phy->mdio.dev.of_node = child;
2e79cb30 FF	77
	78	/* All data is now stored in the phy struct;
	79	* register it */
	80	rc = phy_device_register(phy);
	81	if (rc) {
	82	phy_device_free(phy);
	83	of_node_put(child);
b520bd07	84	return;
2e79cb30 FF	85	}
	86
	87	dev_dbg(&mdio->dev, "registered phy %s at address %i\n",
8fdade4b	88	child->name, addr);
2e79cb30 FF	89	}
2e79cb30 FF	90
b520bd07 SS	91	static void of_mdiobus_register_device(struct mii_bus *mdio,
b520bd07 SS	92	struct device_node *child, u32 addr)
a9049e0c AL	93	{
	94	struct mdio_device *mdiodev;
	95	int rc;
	96
	97	mdiodev = mdio_device_create(mdio, addr);
a3478bae	98	if (IS_ERR(mdiodev))
b520bd07	99	return;
a9049e0c AL	100
	101	/* Associate the OF node with the device structure so it
	102	* can be looked up later.
	103	*/
	104	of_node_get(child);
	105	mdiodev->dev.of_node = child;
	106
	107	/* All data is now stored in the mdiodev struct; register it. */
	108	rc = mdio_device_register(mdiodev);
	109	if (rc) {
	110	mdio_device_free(mdiodev);
	111	of_node_put(child);
b520bd07	112	return;
a9049e0c AL	113	}
	114
	115	dev_dbg(&mdio->dev, "registered mdio device %s at address %i\n",
	116	child->name, addr);
a9049e0c AL	117	}
a9049e0c AL	118
33d67377	119	int of_mdio_parse_addr(struct device dev, const struct device_node np)
8f838288 DM	120	{
	121	u32 addr;
	122	int ret;
	123
	124	ret = of_property_read_u32(np, "reg", &addr);
	125	if (ret < 0) {
	126	dev_err(dev, "%s has invalid PHY address\n", np->full_name);
	127	return ret;
	128	}
	129
	130	/* A PHY must have a reg property in the range [0-31] */
	131	if (addr >= PHY_MAX_ADDR) {
	132	dev_err(dev, "%s PHY address %i is too large\n",
	133	np->full_name, addr);
	134	return -EINVAL;
	135	}
	136
	137	return addr;
	138	}
33d67377	139	EXPORT_SYMBOL(of_mdio_parse_addr);
8f838288	140
ae461131 AL	141	/* The following is a list of PHY compatible strings which appear in
	142	* some DTBs. The compatible string is never matched against a PHY
	143	* driver, so is pointless. We only expect devices which are not PHYs
	144	* to have a compatible string, so they can be matched to an MDIO
	145	* driver. Encourage users to upgrade their DT blobs to remove these.
	146	*/
	147	static const struct of_device_id whitelist_phys[] = {
	148	{ .compatible = "brcm,40nm-ephy" },
	149	{ .compatible = "marvell,88E1111", },
	150	{ .compatible = "marvell,88e1116", },
	151	{ .compatible = "marvell,88e1118", },
f5a952c0	152	{ .compatible = "marvell,88e1145", },
ae461131 AL	153	{ .compatible = "marvell,88e1149r", },
	154	{ .compatible = "marvell,88e1310", },
	155	{ .compatible = "marvell,88E1510", },
	156	{ .compatible = "marvell,88E1514", },
	157	{ .compatible = "moxa,moxart-rtl8201cp", },
	158	{}
	159	};
	160
801a8ef5 AL	161	/*
	162	* Return true if the child node is for a phy. It must either:
	163	* o Compatible string of "ethernet-phy-idX.X"
	164	* o Compatible string of "ethernet-phy-ieee802.3-c45"
	165	* o Compatible string of "ethernet-phy-ieee802.3-c22"
ae461131	166	* o In the white list above (and issue a warning)
801a8ef5 AL	167	* o No compatibility string
	168	*
	169	* A device which is not a phy is expected to have a compatible string
	170	* indicating what sort of device it is.
	171	*/
	172	static bool of_mdiobus_child_is_phy(struct device_node *child)
	173	{
	174	u32 phy_id;
	175
	176	if (of_get_phy_id(child, &phy_id) != -EINVAL)
	177	return true;
	178
	179	if (of_device_is_compatible(child, "ethernet-phy-ieee802.3-c45"))
	180	return true;
	181
	182	if (of_device_is_compatible(child, "ethernet-phy-ieee802.3-c22"))
	183	return true;
	184
ae461131 AL	185	if (of_match_node(whitelist_phys, child)) {
	186	pr_warn(FW_WARN
	187	"%s: Whitelisted compatible string. Please remove\n",
	188	child->full_name);
	189	return true;
	190	}
	191
801a8ef5 AL	192	if (!of_find_property(child, "compatible", NULL))
	193	return true;
	194
	195	return false;
	196	}
	197
8bc487d1 GL	198	/**
	199	* of_mdiobus_register - Register mii_bus and create PHYs from the device tree
	200	* @mdio: pointer to mii_bus structure
	201	* @np: pointer to device_node of MDIO bus.
	202	*
	203	* This function registers the mii_bus structure and registers a phy_device
	204	* for each child node of @np.
	205	*/
	206	int of_mdiobus_register(struct mii_bus mdio, struct device_node np)
	207	{
8bc487d1	208	struct device_node *child;
2e79cb30	209	bool scanphys = false;
e7f4dc35	210	int addr, rc;
8bc487d1 GL	211
	212	/* Mask out all PHYs from auto probing. Instead the PHYs listed in
	213	* the device tree are populated after the bus has been registered */
	214	mdio->phy_mask = ~0;
	215
25106022 DD	216	mdio->dev.of_node = np;
25106022 DD	217
8bc487d1 GL	218	/* Register the MDIO bus */
	219	rc = mdiobus_register(mdio);
	220	if (rc)
	221	return rc;
	222
801a8ef5	223	/* Loop over the child nodes and register a phy_device for each phy */
e207e761	224	for_each_available_child_of_node(np, child) {
8f838288 DM	225	addr = of_mdio_parse_addr(&mdio->dev, child);
8f838288 DM	226	if (addr < 0) {
779d835e	227	scanphys = true;
19458860 DD	228	continue;
	229	}
	230
801a8ef5 AL	231	if (of_mdiobus_child_is_phy(child))
801a8ef5 AL	232	of_mdiobus_register_phy(mdio, child, addr);
a9049e0c AL	233	else
a9049e0c AL	234	of_mdiobus_register_device(mdio, child, addr);
8bc487d1 GL	235	}
8bc487d1 GL	236
779d835e SH	237	if (!scanphys)
	238	return 0;
	239
	240	/* auto scan for PHYs with empty reg property */
	241	for_each_available_child_of_node(np, child) {
	242	/* Skip PHYs with reg property set */
2fca6d28	243	if (of_find_property(child, "reg", NULL))
779d835e SH	244	continue;
779d835e SH	245
779d835e SH	246	for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
779d835e SH	247	/* skip already registered PHYs */
7f854420	248	if (mdiobus_is_registered_device(mdio, addr))
779d835e SH	249	continue;
	250
	251	/* be noisy to encourage people to set reg property */
	252	dev_info(&mdio->dev, "scan phy %s at address %i\n",
	253	child->name, addr);
	254
801a8ef5 AL	255	if (of_mdiobus_child_is_phy(child))
801a8ef5 AL	256	of_mdiobus_register_phy(mdio, child, addr);
779d835e SH	257	}
	258	}
	259
8bc487d1 GL	260	return 0;
	261	}
	262	EXPORT_SYMBOL(of_mdiobus_register);
	263
08a7963a JP	264	/* Helper function for of_phy_find_device */
	265	static int of_phy_match(struct device dev, void phy_np)
	266	{
61c7a080	267	return dev->of_node == phy_np;
08a7963a JP	268	}
08a7963a JP	269
8bc487d1 GL	270	/**
	271	* of_phy_find_device - Give a PHY node, find the phy_device
	272	* @phy_np: Pointer to the phy's device tree node
	273	*
f018ae7a RK	274	* If successful, returns a pointer to the phy_device with the embedded
f018ae7a RK	275	* struct device refcount incremented by one, or NULL on failure.
8bc487d1 GL	276	*/
	277	struct phy_device of_phy_find_device(struct device_node phy_np)
	278	{
	279	struct device *d;
6ed74236 AL	280	struct mdio_device *mdiodev;
6ed74236 AL	281
8bc487d1 GL	282	if (!phy_np)
	283	return NULL;
	284
08a7963a	285	d = bus_find_device(&mdio_bus_type, NULL, phy_np, of_phy_match);
6ed74236 AL	286	if (d) {
	287	mdiodev = to_mdio_device(d);
	288	if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY)
	289	return to_phy_device(d);
	290	}
	291
	292	return NULL;
8bc487d1 GL	293	}
	294	EXPORT_SYMBOL(of_phy_find_device);
	295
	296	/**
	297	* of_phy_connect - Connect to the phy described in the device tree
	298	* @dev: pointer to net_device claiming the phy
	299	* @phy_np: Pointer to device tree node for the PHY
	300	* @hndlr: Link state callback for the network device
735c1e25	301	* @flags: flags to pass to the PHY
8bc487d1 GL	302	* @iface: PHY data interface type
8bc487d1 GL	303	*
f018ae7a RK	304	* If successful, returns a pointer to the phy_device with the embedded
	305	* struct device refcount incremented by one, or NULL on failure. The
	306	* refcount must be dropped by calling phy_disconnect() or phy_detach().
8bc487d1 GL	307	*/
	308	struct phy_device of_phy_connect(struct net_device dev,
	309	struct device_node *phy_np,
	310	void (hndlr)(struct net_device ), u32 flags,
	311	phy_interface_t iface)
	312	{
	313	struct phy_device *phy = of_phy_find_device(phy_np);
f018ae7a	314	int ret;
8bc487d1 GL	315
	316	if (!phy)
	317	return NULL;
	318
2f637151 FF	319	phy->dev_flags = flags;
2f637151 FF	320
f018ae7a RK	321	ret = phy_connect_direct(dev, phy, hndlr, iface);
	322
	323	/* refcount is held by phy_connect_direct() on success */
e5a03bfd	324	put_device(&phy->mdio.dev);
f018ae7a RK	325
f018ae7a RK	326	return ret ? NULL : phy;
8bc487d1 GL	327	}
8bc487d1 GL	328	EXPORT_SYMBOL(of_phy_connect);
24c30dbb	329
7614aba6 AF	330	/**
	331	* of_phy_attach - Attach to a PHY without starting the state machine
	332	* @dev: pointer to net_device claiming the phy
	333	* @phy_np: Node pointer for the PHY
	334	* @flags: flags to pass to the PHY
	335	* @iface: PHY data interface type
f018ae7a RK	336	*
	337	* If successful, returns a pointer to the phy_device with the embedded
	338	* struct device refcount incremented by one, or NULL on failure. The
	339	* refcount must be dropped by calling phy_disconnect() or phy_detach().
7614aba6 AF	340	*/
	341	struct phy_device of_phy_attach(struct net_device dev,
	342	struct device_node *phy_np, u32 flags,
	343	phy_interface_t iface)
	344	{
	345	struct phy_device *phy = of_phy_find_device(phy_np);
f018ae7a	346	int ret;
7614aba6 AF	347
	348	if (!phy)
	349	return NULL;
	350
f018ae7a RK	351	ret = phy_attach_direct(dev, phy, flags, iface);
	352
	353	/* refcount is held by phy_attach_direct() on success */
e5a03bfd	354	put_device(&phy->mdio.dev);
f018ae7a RK	355
f018ae7a RK	356	return ret ? NULL : phy;
7614aba6 AF	357	}
7614aba6 AF	358	EXPORT_SYMBOL(of_phy_attach);
3be2a49e TP	359
	360	#if defined(CONFIG_FIXED_PHY)
	361	/*
	362	* of_phy_is_fixed_link() and of_phy_register_fixed_link() must
	363	* support two DT bindings:
	364	* - the old DT binding, where 'fixed-link' was a property with 5
	365	* cells encoding various informations about the fixed PHY
	366	* - the new DT binding, where 'fixed-link' is a sub-node of the
	367	* Ethernet device.
	368	*/
	369	bool of_phy_is_fixed_link(struct device_node *np)
	370	{
	371	struct device_node *dn;
4cba5c21 SS	372	int len, err;
4cba5c21 SS	373	const char *managed;
3be2a49e TP	374
	375	/* New binding */
	376	dn = of_get_child_by_name(np, "fixed-link");
	377	if (dn) {
	378	of_node_put(dn);
	379	return true;
	380	}
	381
4cba5c21 SS	382	err = of_property_read_string(np, "managed", &managed);
	383	if (err == 0 && strcmp(managed, "auto") != 0)
	384	return true;
	385
3be2a49e TP	386	/* Old binding */
	387	if (of_get_property(np, "fixed-link", &len) &&
	388	len == (5 * sizeof(__be32)))
	389	return true;
	390
	391	return false;
	392	}
	393	EXPORT_SYMBOL(of_phy_is_fixed_link);
	394
	395	int of_phy_register_fixed_link(struct device_node *np)
	396	{
	397	struct fixed_phy_status status = {};
	398	struct device_node *fixed_link_node;
	399	const __be32 *fixed_link_prop;
a5597008	400	int link_gpio;
4cba5c21	401	int len, err;
fd2ef0ba	402	struct phy_device *phy;
4cba5c21 SS	403	const char *managed;
	404
	405	err = of_property_read_string(np, "managed", &managed);
	406	if (err == 0) {
	407	if (strcmp(managed, "in-band-status") == 0) {
	408	/* status is zeroed, namely its .link member */
a5597008	409	phy = fixed_phy_register(PHY_POLL, &status, -1, np);
5189b1d8	410	return PTR_ERR_OR_ZERO(phy);
4cba5c21 SS	411	}
4cba5c21 SS	412	}
3be2a49e TP	413
	414	/* New binding */
	415	fixed_link_node = of_get_child_by_name(np, "fixed-link");
	416	if (fixed_link_node) {
	417	status.link = 1;
a72e1541 RR	418	status.duplex = of_property_read_bool(fixed_link_node,
a72e1541 RR	419	"full-duplex");
3be2a49e TP	420	if (of_property_read_u32(fixed_link_node, "speed", &status.speed))
3be2a49e TP	421	return -EINVAL;
a72e1541 RR	422	status.pause = of_property_read_bool(fixed_link_node, "pause");
	423	status.asym_pause = of_property_read_bool(fixed_link_node,
	424	"asym-pause");
a5597008 AL	425	link_gpio = of_get_named_gpio_flags(fixed_link_node,
a5597008 AL	426	"link-gpios", 0, NULL);
3be2a49e	427	of_node_put(fixed_link_node);
a5597008 AL	428	if (link_gpio == -EPROBE_DEFER)
	429	return -EPROBE_DEFER;
	430
	431	phy = fixed_phy_register(PHY_POLL, &status, link_gpio, np);
5189b1d8	432	return PTR_ERR_OR_ZERO(phy);
3be2a49e TP	433	}
	434
	435	/* Old binding */
	436	fixed_link_prop = of_get_property(np, "fixed-link", &len);
	437	if (fixed_link_prop && len == (5 * sizeof(__be32))) {
	438	status.link = 1;
	439	status.duplex = be32_to_cpu(fixed_link_prop[1]);
	440	status.speed = be32_to_cpu(fixed_link_prop[2]);
	441	status.pause = be32_to_cpu(fixed_link_prop[3]);
	442	status.asym_pause = be32_to_cpu(fixed_link_prop[4]);
a5597008	443	phy = fixed_phy_register(PHY_POLL, &status, -1, np);
5189b1d8	444	return PTR_ERR_OR_ZERO(phy);
3be2a49e TP	445	}
	446
	447	return -ENODEV;
	448	}
	449	EXPORT_SYMBOL(of_phy_register_fixed_link);
	450	#endif