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Commit a7657f12 authored by Giuseppe CAVALLARO's avatar Giuseppe CAVALLARO Committed by David S. Miller
Browse files

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: default avatarGiuseppe Cavallaro <peppe.cavallaro@st.com>
Reviewed-by: default avatarAndreas Färber <afaerber@suse.de>
Tested-by: default avatarFrank 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: default avatarDavid S. Miller <davem@davemloft.net>
parent d7e944c8

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

+5 −11
Original line number Diff line number Diff line
@@ -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. */
@@ -827,10 +826,6 @@ 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);
@@ -871,8 +866,7 @@ 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"))

	if (phydev->is_pseudo_fixed_link)

		phydev->irq = PHY_IGNORE_INTERRUPT;



	pr_debug("stmmac_init_phy:  %s: attached to PHY (UID 0x%x)"

drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c

+1 −18
Original line number Diff line number Diff line
@@ -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;

drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c

+66 −18
Original line number Diff line number Diff line
@@ -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);

include/linux/stmmac.h

+1 −1
Original line number Diff line number Diff line
@@ -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;