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Date: Fri, 11 Mar 2016 23:14:58 +0800
From: Phil Reid <preid@...ctromag.com.au>
To: Giuseppe Cavallaro <peppe.cavallaro@...com>, netdev@...r.kernel.org
Cc: gabriel.fernandez@...aro.org, afaerber@...e.de,
fschaefer.oss@...glemail.com, dinh.linux@...il.com,
davem@...emloft.net
Subject: Re: [PATCHv3 (net.git) 2/2] stmmac: fix MDIO settings
G'day Giuseppe,
I wont be able to test until Monday.
Concept looks ok to me except for comment below.
On 11/03/2016 9:33 PM, Giuseppe Cavallaro wrote:
> 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
> inside the main (for example to skip EEE).
> So the patch uses the is_pseudo_fixed_link and removes
> 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@...com>
> Reviewed-by: Andreas Färber <afaerber@...e.de>
> Tested-by: Frank Schäfer <fschaefer.oss@...glemail.com>
> Cc: Gabriel Fernandez <gabriel.fernandez@...aro.org>
> Cc: Dinh Nguyen <dinh.linux@...il.com>
> Cc: David S. Miller <davem@...emloft.net>
> Cc: Phil Reid <preid@...ctromag.com.au>
> ---
>
> V2: use is_pseudo_fixed_link
> V3: parse device-tree driver parameters to allocate PHY resources considering
> DSA case (+ fixed-link).
>
> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 11 +--
> drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 19 +-----
> .../net/ethernet/stmicro/stmmac/stmmac_platform.c | 77 ++++++++++++++++----
> include/linux/stmmac.h | 2 +-
> 4 files changed, 68 insertions(+), 41 deletions(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index c21015b..389d7d0 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -271,7 +271,6 @@ 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;
>
> @@ -283,7 +282,7 @@ 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. */
> @@ -820,12 +819,8 @@ 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);
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> index 0faf163..3f5512f 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> @@ -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;
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index 6a52fa1..d2322e9 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -96,6 +96,66 @@ static int dwmac1000_validate_ucast_entries(int ucast_entries)
> }
>
> /**
> + * 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 true in case of the mdio needs to be registered in the main.
> + */
> +static bool stmmac_dt_phy(struct plat_stmmacenet_data *plat,
> + struct device_node *np, struct device *dev)
> +{
> + bool ret = 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);
> +
> + ret = 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;
> + }
> +
Won't this always result in plat->mdio_node being assigned to something if np has a child.
Regardless of the compatible string.
Which is why I had the child_node temp.
Still learning so may be missing something.
> + if (plat->mdio_node) {
> + dev_dbg(dev, "Found MDIO subnode\n");
> + ret = true;
> + }
> +
> + return ret;
> +}
> +
> +/**
> * stmmac_probe_config_dt - parse device-tree driver parameters
> * @pdev: platform_device structure
> * @plat: driver data platform structure
> @@ -129,30 +189,19 @@ 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
> + /* To Configure PHY by using all device-tree supported properties */
> + if (stmmac_dt_phy(plat, np, &pdev->dev)) {
> plat->mdio_bus_data =
> devm_kzalloc(&pdev->dev,
> sizeof(struct stmmac_mdio_bus_data),
> GFP_KERNEL);
> + }
>
> of_property_read_u32(np, "tx-fifo-depth", &plat->tx_fifo_size);
>
> diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
> index eead8ab..8b1ff2b 100644
> --- a/include/linux/stmmac.h
> +++ b/include/linux/stmmac.h
> @@ -94,12 +94,12 @@ struct stmmac_dma_cfg {
> };
>
> 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;
>
--
Regards
Phil Reid
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