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Date: Mon, 6 Nov 2017 10:26:44 +0100
From: Nicolas Ferre <nicolas.ferre@...rochip.com>
To: Michael Grzeschik <m.grzeschik@...gutronix.de>,
<netdev@...r.kernel.org>
CC: <kernel@...gutronix.de>, Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH v2] net: macb: add fixed-link node support
On 23/06/2017 at 16:54, Michael Grzeschik wrote:
> In case the MACB is directly connected to a
> non-mdio PHY/device, it should be possible to provide
> a fixed link configuration in the DT.
>
> Signed-off-by: Michael Grzeschik <m.grzeschik@...gutronix.de>
> ---
> v1 -> v2: - moved of_phy_connect case and phy_connect_direct into if else cases
> - moved of_pphy_register_fixed_link into if(np) case
> - added of_node_put(bp->phy_node); into macb_remove
Hi Michael,
by re-scanning my email backlog, I found this remark that may apply to
your patch (already in Linus' tree actually)...
> ---
> drivers/net/ethernet/cadence/macb.c | 98 ++++++++++++++++++++++---------------
> drivers/net/ethernet/cadence/macb.h | 1 +
> 2 files changed, 60 insertions(+), 39 deletions(-)
>
> diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
> index 91f7492623d3f..5781f1ede8c6e 100644
> --- a/drivers/net/ethernet/cadence/macb.c
> +++ b/drivers/net/ethernet/cadence/macb.c
> @@ -425,32 +425,40 @@ static int macb_mii_probe(struct net_device *dev)
> int phy_irq;
> int ret;
>
> - phydev = phy_find_first(bp->mii_bus);
> - if (!phydev) {
> - netdev_err(dev, "no PHY found\n");
> - return -ENXIO;
> - }
> + if (bp->phy_node) {
> + phydev = of_phy_connect(dev, bp->phy_node,
> + &macb_handle_link_change, 0,
> + bp->phy_interface);
> + if (!phydev)
> + return -ENODEV;
> + } else {
> + phydev = phy_find_first(bp->mii_bus);
> + if (!phydev) {
> + netdev_err(dev, "no PHY found\n");
> + return -ENXIO;
> + }
>
> - pdata = dev_get_platdata(&bp->pdev->dev);
> - if (pdata) {
> - if (gpio_is_valid(pdata->phy_irq_pin)) {
> - ret = devm_gpio_request(&bp->pdev->dev,
> - pdata->phy_irq_pin, "phy int");
> - if (!ret) {
> - phy_irq = gpio_to_irq(pdata->phy_irq_pin);
> - phydev->irq = (phy_irq < 0) ? PHY_POLL : phy_irq;
> + pdata = dev_get_platdata(&bp->pdev->dev);
> + if (pdata) {
> + if (gpio_is_valid(pdata->phy_irq_pin)) {
> + ret = devm_gpio_request(&bp->pdev->dev,
> + pdata->phy_irq_pin, "phy int");
> + if (!ret) {
> + phy_irq = gpio_to_irq(pdata->phy_irq_pin);
> + phydev->irq = (phy_irq < 0) ? PHY_POLL : phy_irq;
> + }
> + } else {
> + phydev->irq = PHY_POLL;
> }
> - } else {
> - phydev->irq = PHY_POLL;
> }
> - }
>
> - /* attach the mac to the phy */
> - ret = phy_connect_direct(dev, phydev, &macb_handle_link_change,
> - bp->phy_interface);
> - if (ret) {
> - netdev_err(dev, "Could not attach to PHY\n");
> - return ret;
> + /* attach the mac to the phy */
> + ret = phy_connect_direct(dev, phydev, &macb_handle_link_change,
> + bp->phy_interface);
> + if (ret) {
> + netdev_err(dev, "Could not attach to PHY\n");
> + return ret;
> + }
> }
>
> /* mask with MAC supported features */
> @@ -499,26 +507,37 @@ static int macb_mii_init(struct macb *bp)
>
> np = bp->pdev->dev.of_node;
> if (np) {
> - /* try dt phy registration */
> - err = of_mdiobus_register(bp->mii_bus, np);
> + if (of_phy_is_fixed_link(np)) {
> + if (of_phy_register_fixed_link(np) < 0) {
remark done here by Andrew:
https://www.spinics.net/lists/netdev/msg421186.html
about missing of_phy_deregister_fixed_link().
Can you tell me if you would have time to have a look at it?
Thanks, best regards,
Nicolas
> + dev_err(&bp->pdev->dev,
> + "broken fixed-link specification\n");
> + goto err_out_unregister_bus;
> + }
> + bp->phy_node = of_node_get(np);
>
> - /* fallback to standard phy registration if no phy were
> - * found during dt phy registration
> - */
> - if (!err && !phy_find_first(bp->mii_bus)) {
> - for (i = 0; i < PHY_MAX_ADDR; i++) {
> - struct phy_device *phydev;
> -
> - phydev = mdiobus_scan(bp->mii_bus, i);
> - if (IS_ERR(phydev) &&
> - PTR_ERR(phydev) != -ENODEV) {
> - err = PTR_ERR(phydev);
> - break;
> + err = mdiobus_register(bp->mii_bus);
> + } else {
> + /* try dt phy registration */
> + err = of_mdiobus_register(bp->mii_bus, np);
> +
> + /* fallback to standard phy registration if no phy were
> + * found during dt phy registration
> + */
> + if (!err && !phy_find_first(bp->mii_bus)) {
> + for (i = 0; i < PHY_MAX_ADDR; i++) {
> + struct phy_device *phydev;
> +
> + phydev = mdiobus_scan(bp->mii_bus, i);
> + if (IS_ERR(phydev) &&
> + PTR_ERR(phydev) != -ENODEV) {
> + err = PTR_ERR(phydev);
> + break;
> + }
> }
> - }
>
> - if (err)
> - goto err_out_unregister_bus;
> + if (err)
> + goto err_out_unregister_bus;
> + }
> }
> } else {
> for (i = 0; i < PHY_MAX_ADDR; i++)
> @@ -3438,6 +3457,7 @@ static int macb_remove(struct platform_device *pdev)
> clk_disable_unprepare(bp->hclk);
> clk_disable_unprepare(bp->pclk);
> clk_disable_unprepare(bp->rx_clk);
> + of_node_put(bp->phy_node);
> free_netdev(dev);
> }
>
> diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
> index ec037b0fa2a4d..2510661102bad 100644
> --- a/drivers/net/ethernet/cadence/macb.h
> +++ b/drivers/net/ethernet/cadence/macb.h
> @@ -930,6 +930,7 @@ struct macb {
> struct macb_or_gem_ops macbgem_ops;
>
> struct mii_bus *mii_bus;
> + struct device_node *phy_node;
> int link;
> int speed;
> int duplex;
>
--
Nicolas Ferre
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