[PATCH v1 09/10] net: mvpp2: allow MDIO registration for fixed links
Ramon Fried
rfried.dev at gmail.com
Thu Apr 29 22:26:03 CEST 2021
On Tue, Apr 27, 2021 at 4:29 PM Stefan Roese <sr at denx.de> wrote:
>
> From: Stefan Chulski <stefanc at marvell.com>
>
> Currently, there are 2 valid cases for interface, PHY
> and mdio relation:
> - If an interface has PHY handler, it'll call
> mdio_mii_bus_get_from_phy(), which will register
> MDIO bus.
> - If we want to use fixed-link for an interface,
> PHY handle is not defined in the DTS, and no
> MDIO is registered.
>
> There is a third case, for some boards (with switch),
> the MDIO is used for switch configuration, but the interface
> itself uses fixed link. This patch allows this option by
> checking if fixed-link subnode is defined, in this case,
> MDIO bus is registers, but the PHY address is set to
> PHY_MAX_ADDR for this interface, so this interface will
> not try to access the PHY later on.
>
> Signed-off-by: Stefan Chulski <stefanc at marvell.com>
> Signed-off-by: Stefan Roese <sr at denx.de>
> ---
>
> drivers/net/mvpp2.c | 17 +++++++++++++----
> 1 file changed, 13 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/mvpp2.c b/drivers/net/mvpp2.c
> index 3d920e85ffef..c5bfe41281d6 100644
> --- a/drivers/net/mvpp2.c
> +++ b/drivers/net/mvpp2.c
> @@ -4787,16 +4787,25 @@ static int phy_info_parse(struct udevice *dev, struct mvpp2_port *port)
> u32 id;
> u32 phyaddr = 0;
> int phy_mode = -1;
> + int fixed_link = 0;
> int ret;
>
> phy_node = fdtdec_lookup_phandle(gd->fdt_blob, port_node, "phy");
> + fixed_link = fdt_subnode_offset(gd->fdt_blob, port_node, "fixed-link");
>
> if (phy_node > 0) {
> int parent;
> - phyaddr = fdtdec_get_int(gd->fdt_blob, phy_node, "reg", 0);
> - if (phyaddr < 0) {
> - dev_err(dev, "could not find phy address\n");
> - return -1;
> +
> + if (fixed_link != -FDT_ERR_NOTFOUND) {
> + /* phy_addr is set to invalid value for fixed links */
> + phyaddr = PHY_MAX_ADDR;
> + } else {
> + phyaddr = fdtdec_get_int(gd->fdt_blob, phy_node,
> + "reg", 0);
> + if (phyaddr < 0) {
> + dev_err(dev, "could not find phy address\n");
> + return -1;
> + }
> }
> parent = fdt_parent_offset(gd->fdt_blob, phy_node);
> ret = uclass_get_device_by_of_offset(UCLASS_MDIO, parent,
> --
> 2.31.1
>
Reviewed-by: Ramon Fried <rfried.dev at gmail.com>
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