mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 02:30:34 +02:00
8bc487d150
Add support for parsing the device tree for PHY devices on an MDIO bus. Currently many of the PowerPC ethernet drivers are open coding a solution for reading data out of the device tree to find the correct PHY device. This patch implements a set of common routines to: a) let MDIO bus drivers register phy_devices described in the tree, and b) let MAC drivers find the correct phy_device via the tree. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Andy Fleming <afleming@freescale.com> Signed-off-by: David S. Miller <davem@davemloft.net>
139 lines
3.6 KiB
C
139 lines
3.6 KiB
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/phy.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_mdio.h>
|
|
#include <linux/module.h>
|
|
|
|
MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
/**
|
|
* 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 phy_device *phy;
|
|
struct device_node *child;
|
|
int rc, i;
|
|
|
|
/* 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;
|
|
|
|
/* Clear all the IRQ properties */
|
|
if (mdio->irq)
|
|
for (i=0; i<PHY_MAX_ADDR; i++)
|
|
mdio->irq[i] = PHY_POLL;
|
|
|
|
/* Register the MDIO bus */
|
|
rc = mdiobus_register(mdio);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* Loop over the child nodes and register a phy_device for each one */
|
|
for_each_child_of_node(np, child) {
|
|
const u32 *addr;
|
|
int len;
|
|
|
|
/* A PHY must have a reg property in the range [0-31] */
|
|
addr = of_get_property(child, "reg", &len);
|
|
if (!addr || len < sizeof(*addr) || *addr >= 32 || *addr < 0) {
|
|
dev_err(&mdio->dev, "%s has invalid PHY address\n",
|
|
child->full_name);
|
|
continue;
|
|
}
|
|
|
|
if (mdio->irq) {
|
|
mdio->irq[*addr] = irq_of_parse_and_map(child, 0);
|
|
if (!mdio->irq[*addr])
|
|
mdio->irq[*addr] = PHY_POLL;
|
|
}
|
|
|
|
phy = get_phy_device(mdio, *addr);
|
|
if (!phy) {
|
|
dev_err(&mdio->dev, "error probing PHY at address %i\n",
|
|
*addr);
|
|
continue;
|
|
}
|
|
phy_scan_fixups(phy);
|
|
|
|
/* Associate the OF node with the device structure so it
|
|
* can be looked up later */
|
|
of_node_get(child);
|
|
dev_archdata_set_node(&phy->dev.archdata, 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);
|
|
continue;
|
|
}
|
|
|
|
dev_dbg(&mdio->dev, "registered phy %s at address %i\n",
|
|
child->name, *addr);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(of_mdiobus_register);
|
|
|
|
/**
|
|
* of_phy_find_device - Give a PHY node, find the phy_device
|
|
* @phy_np: Pointer to the phy's device tree node
|
|
*
|
|
* Returns a pointer to the phy_device.
|
|
*/
|
|
struct phy_device *of_phy_find_device(struct device_node *phy_np)
|
|
{
|
|
struct device *d;
|
|
int match(struct device *dev, void *phy_np)
|
|
{
|
|
return dev_archdata_get_node(&dev->archdata) == phy_np;
|
|
}
|
|
|
|
if (!phy_np)
|
|
return NULL;
|
|
|
|
d = bus_find_device(&mdio_bus_type, NULL, phy_np, 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
|
|
*
|
|
* Returns a pointer to the phy_device if successfull. NULL otherwise
|
|
*/
|
|
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);
|
|
|
|
if (!phy)
|
|
return NULL;
|
|
|
|
return phy_connect_direct(dev, phy, hndlr, flags, iface) ? NULL : phy;
|
|
}
|
|
EXPORT_SYMBOL(of_phy_connect);
|