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net: mvpp2: allow MDIO registration for fixed links

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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@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Stefan Chulski
2021-05-03 08:08:52 +02:00
committed by Stefan Roese
parent d757c859c7
commit 27844000ef
1 changed files with 13 additions and 4 deletions
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17
drivers/net/mvpp2.c
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@@ -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,