stmmac: fix MDIO settings

Initially the phy_bus_name was added to manipulate the
driver name but it was recently just used to manage the
fixed-link and then to take some decision at run-time.
So the patch uses the is_pseudo_fixed_link and removes
the phy_bus_name variable not necessary anymore.

The driver can manage the mdio registration by using phy-handle,
dwmac-mdio and own parameter e.g. snps,phy-addr.
This patch takes care about all these possible configurations
and fixes the mdio registration in case of there is a real
transceiver or a switch (that needs to be managed by using
fixed-link).

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Tested-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Cc: Gabriel Fernandez <gabriel.fernandez@linaro.org>
Cc: Dinh Nguyen <dinh.linux@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Phil Reid <preid@electromag.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Giuseppe CAVALLARO 2016-04-01 09:07:16 +02:00 committed by David S. Miller
parent d7e944c8dd
commit a7657f128c
4 changed files with 73 additions and 48 deletions

View file

@ -278,7 +278,6 @@ static void stmmac_eee_ctrl_timer(unsigned long arg)
*/
bool stmmac_eee_init(struct stmmac_priv *priv)
{
char *phy_bus_name = priv->plat->phy_bus_name;
unsigned long flags;
bool ret = false;
@ -290,7 +289,7 @@ bool stmmac_eee_init(struct stmmac_priv *priv)
goto out;
/* Never init EEE in case of a switch is attached */
if (phy_bus_name && (!strcmp(phy_bus_name, "fixed")))
if (priv->phydev->is_pseudo_fixed_link)
goto out;
/* MAC core supports the EEE feature. */
@ -827,12 +826,8 @@ static int stmmac_init_phy(struct net_device *dev)
phydev = of_phy_connect(dev, priv->plat->phy_node,
&stmmac_adjust_link, 0, interface);
} else {
if (priv->plat->phy_bus_name)
snprintf(bus_id, MII_BUS_ID_SIZE, "%s-%x",
priv->plat->phy_bus_name, priv->plat->bus_id);
else
snprintf(bus_id, MII_BUS_ID_SIZE, "stmmac-%x",
priv->plat->bus_id);
snprintf(bus_id, MII_BUS_ID_SIZE, "stmmac-%x",
priv->plat->bus_id);
snprintf(phy_id_fmt, MII_BUS_ID_SIZE + 3, PHY_ID_FMT, bus_id,
priv->plat->phy_addr);
@ -871,9 +866,8 @@ static int stmmac_init_phy(struct net_device *dev)
}
/* If attached to a switch, there is no reason to poll phy handler */
if (priv->plat->phy_bus_name)
if (!strcmp(priv->plat->phy_bus_name, "fixed"))
phydev->irq = PHY_IGNORE_INTERRUPT;
if (phydev->is_pseudo_fixed_link)
phydev->irq = PHY_IGNORE_INTERRUPT;
pr_debug("stmmac_init_phy: %s: attached to PHY (UID 0x%x)"
" Link = %d\n", dev->name, phydev->phy_id, phydev->link);

View file

@ -198,29 +198,12 @@ int stmmac_mdio_register(struct net_device *ndev)
struct mii_bus *new_bus;
struct stmmac_priv *priv = netdev_priv(ndev);
struct stmmac_mdio_bus_data *mdio_bus_data = priv->plat->mdio_bus_data;
struct device_node *mdio_node = priv->plat->mdio_node;
int addr, found;
struct device_node *mdio_node = NULL;
struct device_node *child_node = NULL;
if (!mdio_bus_data)
return 0;
if (IS_ENABLED(CONFIG_OF)) {
for_each_child_of_node(priv->device->of_node, child_node) {
if (of_device_is_compatible(child_node,
"snps,dwmac-mdio")) {
mdio_node = child_node;
break;
}
}
if (mdio_node) {
netdev_dbg(ndev, "FOUND MDIO subnode\n");
} else {
netdev_warn(ndev, "No MDIO subnode found\n");
}
}
new_bus = mdiobus_alloc();
if (new_bus == NULL)
return -ENOMEM;

View file

@ -131,6 +131,69 @@ static struct stmmac_axi *stmmac_axi_setup(struct platform_device *pdev)
return axi;
}
/**
* stmmac_dt_phy - parse device-tree driver parameters to allocate PHY resources
* @plat: driver data platform structure
* @np: device tree node
* @dev: device pointer
* Description:
* The mdio bus will be allocated in case of a phy transceiver is on board;
* it will be NULL if the fixed-link is configured.
* If there is the "snps,dwmac-mdio" sub-node the mdio will be allocated
* in any case (for DSA, mdio must be registered even if fixed-link).
* The table below sums the supported configurations:
* -------------------------------
* snps,phy-addr | Y
* -------------------------------
* phy-handle | Y
* -------------------------------
* fixed-link | N
* -------------------------------
* snps,dwmac-mdio |
* even if | Y
* fixed-link |
* -------------------------------
*
* It returns 0 in case of success otherwise -ENODEV.
*/
static int stmmac_dt_phy(struct plat_stmmacenet_data *plat,
struct device_node *np, struct device *dev)
{
bool mdio = true;
/* If phy-handle property is passed from DT, use it as the PHY */
plat->phy_node = of_parse_phandle(np, "phy-handle", 0);
if (plat->phy_node)
dev_dbg(dev, "Found phy-handle subnode\n");
/* If phy-handle is not specified, check if we have a fixed-phy */
if (!plat->phy_node && of_phy_is_fixed_link(np)) {
if ((of_phy_register_fixed_link(np) < 0))
return -ENODEV;
dev_dbg(dev, "Found fixed-link subnode\n");
plat->phy_node = of_node_get(np);
mdio = false;
}
/* If snps,dwmac-mdio is passed from DT, always register the MDIO */
for_each_child_of_node(np, plat->mdio_node) {
if (of_device_is_compatible(plat->mdio_node, "snps,dwmac-mdio"))
break;
}
if (plat->mdio_node) {
dev_dbg(dev, "Found MDIO subnode\n");
mdio = true;
}
if (mdio)
plat->mdio_bus_data =
devm_kzalloc(dev, sizeof(struct stmmac_mdio_bus_data),
GFP_KERNEL);
return 0;
}
/**
* stmmac_probe_config_dt - parse device-tree driver parameters
* @pdev: platform_device structure
@ -165,30 +228,15 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
/* Default to phy auto-detection */
plat->phy_addr = -1;
/* If we find a phy-handle property, use it as the PHY */
plat->phy_node = of_parse_phandle(np, "phy-handle", 0);
/* If phy-handle is not specified, check if we have a fixed-phy */
if (!plat->phy_node && of_phy_is_fixed_link(np)) {
if ((of_phy_register_fixed_link(np) < 0))
return ERR_PTR(-ENODEV);
plat->phy_node = of_node_get(np);
}
/* "snps,phy-addr" is not a standard property. Mark it as deprecated
* and warn of its use. Remove this when phy node support is added.
*/
if (of_property_read_u32(np, "snps,phy-addr", &plat->phy_addr) == 0)
dev_warn(&pdev->dev, "snps,phy-addr property is deprecated\n");
if ((plat->phy_node && !of_phy_is_fixed_link(np)) || plat->phy_bus_name)
plat->mdio_bus_data = NULL;
else
plat->mdio_bus_data =
devm_kzalloc(&pdev->dev,
sizeof(struct stmmac_mdio_bus_data),
GFP_KERNEL);
/* To Configure PHY by using all device-tree supported properties */
if (stmmac_dt_phy(plat, np, &pdev->dev))
return ERR_PTR(-ENODEV);
of_property_read_u32(np, "tx-fifo-depth", &plat->tx_fifo_size);

View file

@ -108,12 +108,12 @@ struct stmmac_axi {
};
struct plat_stmmacenet_data {
char *phy_bus_name;
int bus_id;
int phy_addr;
int interface;
struct stmmac_mdio_bus_data *mdio_bus_data;
struct device_node *phy_node;
struct device_node *mdio_node;
struct stmmac_dma_cfg *dma_cfg;
int clk_csr;
int has_gmac;