On Thu, Nov 01, 2018 at 05:01:36PM +0000, Ian Abbott wrote:
> The Designware driver registers a local MDIO bus for each MAC device,
> but without setting a device node pointer for the MDIO bus device. In
> this case, mdiobus_register() will use the MDIO bus's parent device node
> (if any) as the MDIO device node.
>
> If the MAC device node has a child node compatible with
> "snps,dwmac-mdio", let us use that as the MDIO bus device node.
> Otherwise, leave the MDIO bus device node pointer set to NULL and carry
> on as before.
>
> The upshot is that PHY device nodes can now be placed in an intermediate
> node for the MDIO bus instead of having to place them directly in the
> Designware MAC device node.
>
> (Tested on a Terasic DE0-Nano-SoC with a suitably modified device tree.)
>
> Signed-off-by: Ian Abbott <abbotti@xxxxxxxxx>
> ---
> drivers/net/designware.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
Applied, thanks
Sascha
>
> diff --git a/drivers/net/designware.c b/drivers/net/designware.c
> index 49ddaa20d..58880b0e5 100644
> --- a/drivers/net/designware.c
> +++ b/drivers/net/designware.c
> @@ -408,12 +408,22 @@ static void dwc_version(struct device_d *dev, u32 hwid)
>
> static int dwc_probe_dt(struct device_d *dev, struct dw_eth_dev *priv)
> {
> + struct device_node *child;
> +
> if (!IS_ENABLED(CONFIG_OFTREE))
> return -ENODEV;
>
> priv->phy_addr = -1;
> priv->interface = of_get_phy_mode(dev->device_node);
>
> + /* Set MDIO bus device node, if present. */
> + for_each_child_of_node(dev->device_node, child) {
> + if (of_device_is_compatible(child, "snps,dwmac-mdio")) {
> + priv->miibus.dev.device_node = child;
> + break;
> + }
> + }
> +
> return 0;
> }
>
> --
> 2.19.1
>
>
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