[deliverable/linux.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 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 (!phy || IS_ERR(phy))
		return 1;

	rc = irq_of_parse_and_map(child, 0);
	if (rc > 0) {
		phy->irq = rc;
		if (mdio->irq)
			mdio->irq[addr] = rc;
	} else {
		if (mdio->irq)
			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 1;
	}

	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 (!mdiodev || IS_ERR(mdiodev))
		return 1;

	/* 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 1;
	}

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

	return 0;
}

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);

/*
 * 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 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_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;
	const __be32 *paddr;
	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 */
		paddr = of_get_property(child, "reg", NULL);
		if (paddr)
			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;
	if (!phy_np)
		return NULL;

	d = bus_find_device(&mdio_bus_type, NULL, phy_np, of_phy_match);
	return d ? to_phy_device(d) : 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
 * @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 IS_ERR(phy) ? PTR_ERR(phy) : 0;
		}
	}

	/* 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 IS_ERR(phy) ? PTR_ERR(phy) : 0;
	}

	/* 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 IS_ERR(phy) ? PTR_ERR(phy) : 0;
	}

	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
2e79cb30 FF	44	static int of_mdiobus_register_phy(struct mii_bus mdio, struct device_node child,
	45	u32 addr)
	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);
2e79cb30 FF	59	if (!phy \|\| IS_ERR(phy))
	60	return 1;
	61
f15c586d BD	62	rc = irq_of_parse_and_map(child, 0);
	63	if (rc > 0) {
	64	phy->irq = rc;
	65	if (mdio->irq)
	66	mdio->irq[addr] = rc;
	67	} else {
	68	if (mdio->irq)
	69	phy->irq = mdio->irq[addr];
2e79cb30 FF	70	}
2e79cb30 FF	71
ab6016e0 FF	72	if (of_property_read_bool(child, "broken-turn-around"))
	73	mdio->phy_ignore_ta_mask \|= 1 << addr;
	74
2e79cb30 FF	75	/* Associate the OF node with the device structure so it
	76	* can be looked up later */
	77	of_node_get(child);
e5a03bfd	78	phy->mdio.dev.of_node = child;
2e79cb30 FF	79
	80	/* All data is now stored in the phy struct;
	81	* register it */
	82	rc = phy_device_register(phy);
	83	if (rc) {
	84	phy_device_free(phy);
	85	of_node_put(child);
	86	return 1;
	87	}
	88
	89	dev_dbg(&mdio->dev, "registered phy %s at address %i\n",
8fdade4b	90	child->name, addr);
2e79cb30 FF	91
	92	return 0;
	93	}
	94
a9049e0c AL	95	static int of_mdiobus_register_device(struct mii_bus *mdio,
	96	struct device_node *child,
	97	u32 addr)
	98	{
	99	struct mdio_device *mdiodev;
	100	int rc;
	101
	102	mdiodev = mdio_device_create(mdio, addr);
	103	if (!mdiodev \|\| IS_ERR(mdiodev))
	104	return 1;
	105
	106	/* Associate the OF node with the device structure so it
	107	* can be looked up later.
	108	*/
	109	of_node_get(child);
	110	mdiodev->dev.of_node = child;
	111
	112	/* All data is now stored in the mdiodev struct; register it. */
	113	rc = mdio_device_register(mdiodev);
	114	if (rc) {
	115	mdio_device_free(mdiodev);
	116	of_node_put(child);
	117	return 1;
	118	}
	119
	120	dev_dbg(&mdio->dev, "registered mdio device %s at address %i\n",
	121	child->name, addr);
	122
	123	return 0;
	124	}
	125
33d67377	126	int of_mdio_parse_addr(struct device dev, const struct device_node np)
8f838288 DM	127	{
	128	u32 addr;
	129	int ret;
	130
	131	ret = of_property_read_u32(np, "reg", &addr);
	132	if (ret < 0) {
	133	dev_err(dev, "%s has invalid PHY address\n", np->full_name);
	134	return ret;
	135	}
	136
	137	/* A PHY must have a reg property in the range [0-31] */
	138	if (addr >= PHY_MAX_ADDR) {
	139	dev_err(dev, "%s PHY address %i is too large\n",
	140	np->full_name, addr);
	141	return -EINVAL;
	142	}
	143
	144	return addr;
	145	}
33d67377	146	EXPORT_SYMBOL(of_mdio_parse_addr);
8f838288	147
801a8ef5 AL	148	/*
	149	* Return true if the child node is for a phy. It must either:
	150	* o Compatible string of "ethernet-phy-idX.X"
	151	* o Compatible string of "ethernet-phy-ieee802.3-c45"
	152	* o Compatible string of "ethernet-phy-ieee802.3-c22"
	153	* o No compatibility string
	154	*
	155	* A device which is not a phy is expected to have a compatible string
	156	* indicating what sort of device it is.
	157	*/
	158	static bool of_mdiobus_child_is_phy(struct device_node *child)
	159	{
	160	u32 phy_id;
	161
	162	if (of_get_phy_id(child, &phy_id) != -EINVAL)
	163	return true;
	164
	165	if (of_device_is_compatible(child, "ethernet-phy-ieee802.3-c45"))
	166	return true;
	167
	168	if (of_device_is_compatible(child, "ethernet-phy-ieee802.3-c22"))
	169	return true;
	170
	171	if (!of_find_property(child, "compatible", NULL))
	172	return true;
	173
	174	return false;
	175	}
	176
8bc487d1 GL	177	/**
	178	* of_mdiobus_register - Register mii_bus and create PHYs from the device tree
	179	* @mdio: pointer to mii_bus structure
	180	* @np: pointer to device_node of MDIO bus.
	181	*
	182	* This function registers the mii_bus structure and registers a phy_device
	183	* for each child node of @np.
	184	*/
	185	int of_mdiobus_register(struct mii_bus mdio, struct device_node np)
	186	{
8bc487d1	187	struct device_node *child;
779d835e	188	const __be32 *paddr;
2e79cb30	189	bool scanphys = false;
e7f4dc35	190	int addr, rc;
8bc487d1 GL	191
	192	/* Mask out all PHYs from auto probing. Instead the PHYs listed in
	193	* the device tree are populated after the bus has been registered */
	194	mdio->phy_mask = ~0;
	195
25106022 DD	196	mdio->dev.of_node = np;
25106022 DD	197
8bc487d1 GL	198	/* Register the MDIO bus */
	199	rc = mdiobus_register(mdio);
	200	if (rc)
	201	return rc;
	202
801a8ef5	203	/* Loop over the child nodes and register a phy_device for each phy */
e207e761	204	for_each_available_child_of_node(np, child) {
8f838288 DM	205	addr = of_mdio_parse_addr(&mdio->dev, child);
8f838288 DM	206	if (addr < 0) {
779d835e	207	scanphys = true;
19458860 DD	208	continue;
	209	}
	210
801a8ef5 AL	211	if (of_mdiobus_child_is_phy(child))
801a8ef5 AL	212	of_mdiobus_register_phy(mdio, child, addr);
a9049e0c AL	213	else
a9049e0c AL	214	of_mdiobus_register_device(mdio, child, addr);
8bc487d1 GL	215	}
8bc487d1 GL	216
779d835e SH	217	if (!scanphys)
	218	return 0;
	219
	220	/* auto scan for PHYs with empty reg property */
	221	for_each_available_child_of_node(np, child) {
	222	/* Skip PHYs with reg property set */
24f28dde	223	paddr = of_get_property(child, "reg", NULL);
779d835e SH	224	if (paddr)
	225	continue;
	226
779d835e SH	227	for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
779d835e SH	228	/* skip already registered PHYs */
7f854420	229	if (mdiobus_is_registered_device(mdio, addr))
779d835e SH	230	continue;
	231
	232	/* be noisy to encourage people to set reg property */
	233	dev_info(&mdio->dev, "scan phy %s at address %i\n",
	234	child->name, addr);
	235
801a8ef5 AL	236	if (of_mdiobus_child_is_phy(child))
801a8ef5 AL	237	of_mdiobus_register_phy(mdio, child, addr);
779d835e SH	238	}
	239	}
	240
8bc487d1 GL	241	return 0;
	242	}
	243	EXPORT_SYMBOL(of_mdiobus_register);
	244
08a7963a JP	245	/* Helper function for of_phy_find_device */
	246	static int of_phy_match(struct device dev, void phy_np)
	247	{
61c7a080	248	return dev->of_node == phy_np;
08a7963a JP	249	}
08a7963a JP	250
8bc487d1 GL	251	/**
	252	* of_phy_find_device - Give a PHY node, find the phy_device
	253	* @phy_np: Pointer to the phy's device tree node
	254	*
f018ae7a RK	255	* If successful, returns a pointer to the phy_device with the embedded
f018ae7a RK	256	* struct device refcount incremented by one, or NULL on failure.
8bc487d1 GL	257	*/
	258	struct phy_device of_phy_find_device(struct device_node phy_np)
	259	{
	260	struct device *d;
8bc487d1 GL	261	if (!phy_np)
	262	return NULL;
	263
08a7963a	264	d = bus_find_device(&mdio_bus_type, NULL, phy_np, of_phy_match);
8bc487d1 GL	265	return d ? to_phy_device(d) : NULL;
	266	}
	267	EXPORT_SYMBOL(of_phy_find_device);
	268
	269	/**
	270	* of_phy_connect - Connect to the phy described in the device tree
	271	* @dev: pointer to net_device claiming the phy
	272	* @phy_np: Pointer to device tree node for the PHY
	273	* @hndlr: Link state callback for the network device
	274	* @iface: PHY data interface type
	275	*
f018ae7a RK	276	* If successful, returns a pointer to the phy_device with the embedded
	277	* struct device refcount incremented by one, or NULL on failure. The
	278	* refcount must be dropped by calling phy_disconnect() or phy_detach().
8bc487d1 GL	279	*/
	280	struct phy_device of_phy_connect(struct net_device dev,
	281	struct device_node *phy_np,
	282	void (hndlr)(struct net_device ), u32 flags,
	283	phy_interface_t iface)
	284	{
	285	struct phy_device *phy = of_phy_find_device(phy_np);
f018ae7a	286	int ret;
8bc487d1 GL	287
	288	if (!phy)
	289	return NULL;
	290
2f637151 FF	291	phy->dev_flags = flags;
2f637151 FF	292
f018ae7a RK	293	ret = phy_connect_direct(dev, phy, hndlr, iface);
	294
	295	/* refcount is held by phy_connect_direct() on success */
e5a03bfd	296	put_device(&phy->mdio.dev);
f018ae7a RK	297
f018ae7a RK	298	return ret ? NULL : phy;
8bc487d1 GL	299	}
8bc487d1 GL	300	EXPORT_SYMBOL(of_phy_connect);
24c30dbb	301
7614aba6 AF	302	/**
	303	* of_phy_attach - Attach to a PHY without starting the state machine
	304	* @dev: pointer to net_device claiming the phy
	305	* @phy_np: Node pointer for the PHY
	306	* @flags: flags to pass to the PHY
	307	* @iface: PHY data interface type
f018ae7a RK	308	*
	309	* If successful, returns a pointer to the phy_device with the embedded
	310	* struct device refcount incremented by one, or NULL on failure. The
	311	* refcount must be dropped by calling phy_disconnect() or phy_detach().
7614aba6 AF	312	*/
	313	struct phy_device of_phy_attach(struct net_device dev,
	314	struct device_node *phy_np, u32 flags,
	315	phy_interface_t iface)
	316	{
	317	struct phy_device *phy = of_phy_find_device(phy_np);
f018ae7a	318	int ret;
7614aba6 AF	319
	320	if (!phy)
	321	return NULL;
	322
f018ae7a RK	323	ret = phy_attach_direct(dev, phy, flags, iface);
	324
	325	/* refcount is held by phy_attach_direct() on success */
e5a03bfd	326	put_device(&phy->mdio.dev);
f018ae7a RK	327
f018ae7a RK	328	return ret ? NULL : phy;
7614aba6 AF	329	}
7614aba6 AF	330	EXPORT_SYMBOL(of_phy_attach);
3be2a49e TP	331
	332	#if defined(CONFIG_FIXED_PHY)
	333	/*
	334	* of_phy_is_fixed_link() and of_phy_register_fixed_link() must
	335	* support two DT bindings:
	336	* - the old DT binding, where 'fixed-link' was a property with 5
	337	* cells encoding various informations about the fixed PHY
	338	* - the new DT binding, where 'fixed-link' is a sub-node of the
	339	* Ethernet device.
	340	*/
	341	bool of_phy_is_fixed_link(struct device_node *np)
	342	{
	343	struct device_node *dn;
4cba5c21 SS	344	int len, err;
4cba5c21 SS	345	const char *managed;
3be2a49e TP	346
	347	/* New binding */
	348	dn = of_get_child_by_name(np, "fixed-link");
	349	if (dn) {
	350	of_node_put(dn);
	351	return true;
	352	}
	353
4cba5c21 SS	354	err = of_property_read_string(np, "managed", &managed);
	355	if (err == 0 && strcmp(managed, "auto") != 0)
	356	return true;
	357
3be2a49e TP	358	/* Old binding */
	359	if (of_get_property(np, "fixed-link", &len) &&
	360	len == (5 * sizeof(__be32)))
	361	return true;
	362
	363	return false;
	364	}
	365	EXPORT_SYMBOL(of_phy_is_fixed_link);
	366
	367	int of_phy_register_fixed_link(struct device_node *np)
	368	{
	369	struct fixed_phy_status status = {};
	370	struct device_node *fixed_link_node;
	371	const __be32 *fixed_link_prop;
a5597008	372	int link_gpio;
4cba5c21	373	int len, err;
fd2ef0ba	374	struct phy_device *phy;
4cba5c21 SS	375	const char *managed;
	376
	377	err = of_property_read_string(np, "managed", &managed);
	378	if (err == 0) {
	379	if (strcmp(managed, "in-band-status") == 0) {
	380	/* status is zeroed, namely its .link member */
a5597008	381	phy = fixed_phy_register(PHY_POLL, &status, -1, np);
4cba5c21 SS	382	return IS_ERR(phy) ? PTR_ERR(phy) : 0;
	383	}
	384	}
3be2a49e TP	385
	386	/* New binding */
	387	fixed_link_node = of_get_child_by_name(np, "fixed-link");
	388	if (fixed_link_node) {
	389	status.link = 1;
a72e1541 RR	390	status.duplex = of_property_read_bool(fixed_link_node,
a72e1541 RR	391	"full-duplex");
3be2a49e TP	392	if (of_property_read_u32(fixed_link_node, "speed", &status.speed))
3be2a49e TP	393	return -EINVAL;
a72e1541 RR	394	status.pause = of_property_read_bool(fixed_link_node, "pause");
	395	status.asym_pause = of_property_read_bool(fixed_link_node,
	396	"asym-pause");
a5597008 AL	397	link_gpio = of_get_named_gpio_flags(fixed_link_node,
a5597008 AL	398	"link-gpios", 0, NULL);
3be2a49e	399	of_node_put(fixed_link_node);
a5597008 AL	400	if (link_gpio == -EPROBE_DEFER)
	401	return -EPROBE_DEFER;
	402
	403	phy = fixed_phy_register(PHY_POLL, &status, link_gpio, np);
fd2ef0ba	404	return IS_ERR(phy) ? PTR_ERR(phy) : 0;
3be2a49e TP	405	}
	406
	407	/* Old binding */
	408	fixed_link_prop = of_get_property(np, "fixed-link", &len);
	409	if (fixed_link_prop && len == (5 * sizeof(__be32))) {
	410	status.link = 1;
	411	status.duplex = be32_to_cpu(fixed_link_prop[1]);
	412	status.speed = be32_to_cpu(fixed_link_prop[2]);
	413	status.pause = be32_to_cpu(fixed_link_prop[3]);
	414	status.asym_pause = be32_to_cpu(fixed_link_prop[4]);
a5597008	415	phy = fixed_phy_register(PHY_POLL, &status, -1, np);
fd2ef0ba	416	return IS_ERR(phy) ? PTR_ERR(phy) : 0;
3be2a49e TP	417	}
	418
	419	return -ENODEV;
	420	}
	421	EXPORT_SYMBOL(of_phy_register_fixed_link);
	422	#endif