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of: provide a binding for fixed link PHYs

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Some Ethernet MACs have a "fixed link", and are not connected to a
normal MDIO-managed PHY device. For those situations, a Device Tree
binding allows to describe a "fixed link" using a special PHY node.

This patch adds:

 * A documentation for the fixed PHY Device Tree binding.

 * An of_phy_is_fixed_link() function that an Ethernet driver can call
   on its PHY phandle to find out whether it's a fixed link PHY or
   not. It should typically be used to know if
   of_phy_register_fixed_link() should be called.

 * An of_phy_register_fixed_link() function that instantiates the
   fixed PHY into the PHY subsystem, so that when the driver calls
   of_phy_connect(), the PHY device associated to the OF node will be
   found.

These two additional functions also support the old fixed-link Device
Tree binding used on PowerPC platforms, so that ultimately, the
network device drivers for those platforms could be converted to use
of_phy_is_fixed_link() and of_phy_register_fixed_link() instead of
of_phy_connect_fixed_link(), while keeping compatibility with their
respective Device Tree bindings.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Petazzoni
2014-05-16 16:14:05 +02:00
committed by David S. Miller
parent a759512174
commit 3be2a49e5c
3 changed files with 112 additions and 0 deletions
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67
drivers/of/of_mdio.c
View File

@@ -14,6 +14,7 @@
#include <linux/netdevice.h>
#include <linux/err.h>
#include <linux/phy.h>
#include <linux/phy_fixed.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_mdio.h>
@@ -301,3 +302,69 @@ struct phy_device *of_phy_attach(struct net_device *dev,
return phy_attach_direct(dev, phy, flags, iface) ? 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;
/* New binding */
dn = of_get_child_by_name(np, "fixed-link");
if (dn) {
of_node_put(dn);
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 len;
/* 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(np, "full-duplex");
if (of_property_read_u32(fixed_link_node, "speed", &status.speed))
return -EINVAL;
status.pause = of_property_read_bool(np, "pause");
status.asym_pause = of_property_read_bool(np, "asym-pause");
of_node_put(fixed_link_node);
return fixed_phy_register(PHY_POLL, &status, np);
}
/* 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]);
return fixed_phy_register(PHY_POLL, &status, np);
}
return -ENODEV;
}
EXPORT_SYMBOL(of_phy_register_fixed_link);
#endif