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net: phy: Support limiting phy speed in the devicetree 

Even when both the ethernet controller and the phy support certain
features a board may have additional limitations. Allow specifying
it in the devicetree.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2014-05-21 11:56:12 +02:00
parent 9cbfe615f9
commit 4778c7da37
2 changed files with 50 additions and 8 deletions
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36
drivers/net/phy/mdio_bus.c
View File

@ -242,6 +242,39 @@ static struct file_operations phydev_ops = {
.lseek = dev_lseek_default,
};
static void of_set_phy_supported(struct phy_device *phydev)
{
struct device_node *node = phydev->dev.device_node;
u32 max_speed;
if (!IS_ENABLED(CONFIG_OFDEVICE))
return;
if (!node)
return;
if (!of_property_read_u32(node, "max-speed", &max_speed)) {
/*
* The default values for phydev->supported are provided by the PHY
* driver "features" member, we want to reset to sane defaults first
* before supporting higher speeds.
*/
phydev->supported &= PHY_DEFAULT_FEATURES;
switch (max_speed) {
default:
return;
case SPEED_1000:
phydev->supported |= PHY_1000BT_FEATURES;
case SPEED_100:
phydev->supported |= PHY_100BT_FEATURES;
case SPEED_10:
phydev->supported |= PHY_10BT_FEATURES;
}
}
}
static int mdio_bus_probe(struct device_d *_dev)
{
struct phy_device *dev = to_phy_device(_dev);
@ -275,7 +308,8 @@ static int mdio_bus_probe(struct device_d *_dev)
* a controller will attach, and may modify one
* or both of these values */
dev->supported = drv->features;
dev->advertising = drv->features;
of_set_phy_supported(dev);
dev->advertising = dev->supported;
dev_add_param_int_ro(&dev->dev, "phy_addr", dev->addr, "%d");
dev_add_param_int_ro(&dev->dev, "phy_id", dev->phy_id, "0x%08x");

22
include/linux/phy.h
View File

@ -20,18 +20,26 @@
#include <linux/ethtool.h>
#include <linux/mii.h>
#define PHY_BASIC_FEATURES (SUPPORTED_10baseT_Half | \
SUPPORTED_10baseT_Full | \
SUPPORTED_100baseT_Half | \
SUPPORTED_100baseT_Full | \
SUPPORTED_Autoneg | \
#define PHY_DEFAULT_FEATURES (SUPPORTED_Autoneg | \
SUPPORTED_TP | \
SUPPORTED_MII)
#define PHY_GBIT_FEATURES (PHY_BASIC_FEATURES | \
SUPPORTED_1000baseT_Half | \
#define PHY_10BT_FEATURES (SUPPORTED_10baseT_Half | \
SUPPORTED_10baseT_Full)
#define PHY_100BT_FEATURES (SUPPORTED_100baseT_Half | \
SUPPORTED_100baseT_Full)
#define PHY_1000BT_FEATURES (SUPPORTED_1000baseT_Half | \
SUPPORTED_1000baseT_Full)
#define PHY_BASIC_FEATURES (PHY_10BT_FEATURES | \
PHY_100BT_FEATURES | \
PHY_DEFAULT_FEATURES)
#define PHY_GBIT_FEATURES (PHY_BASIC_FEATURES | \
PHY_1000BT_FEATURES)
/* Interface Mode definitions */
typedef enum {
PHY_INTERFACE_MODE_NA,