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net: bgmac: support MDIO described in DT

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Check ethernet controller DT node for "mdio" subnode and use it with
of_mdiobus_register() when present. That allows specifying MDIO and its
PHY devices in a standard DT based way.

This is required for BCM53573 SoC support. That family is sometimes
called Northstar (by marketing?) but is quite different from it. It uses
different CPU(s) and many different hw blocks.

One of shared blocks in BCM53573 is Ethernet controller. Switch however
is not SRAB accessible (as it Northstar) but is MDIO attached.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rafał Miłecki 2021-10-02 19:58:12 +02:00 committed by David S. Miller
parent b537550918
commit 45c9d96668
1 changed files with 5 additions and 1 deletions
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6
drivers/net/ethernet/broadcom/bgmac-bcma-mdio.c
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@ -10,6 +10,7 @@
#include <linux/bcma/bcma.h>
#include <linux/brcmphy.h>
#include <linux/of_mdio.h>
#include "bgmac.h"
static bool bcma_mdio_wait_value(struct bcma_device *core, u16 reg, u32 mask,
@ -211,6 +212,7 @@ struct mii_bus *bcma_mdio_mii_register(struct bgmac *bgmac)
{
struct bcma_device *core = bgmac->bcma.core;
struct mii_bus *mii_bus;
struct device_node *np;
int err;
mii_bus = mdiobus_alloc();
@ -229,7 +231,9 @@ struct mii_bus *bcma_mdio_mii_register(struct bgmac *bgmac)
mii_bus->parent = &core->dev;
mii_bus->phy_mask = ~(1 << bgmac->phyaddr);
err = mdiobus_register(mii_bus);
np = of_get_child_by_name(core->dev.of_node, "mdio");
err = of_mdiobus_register(mii_bus, np);
if (err) {
dev_err(&core->dev, "Registration of mii bus failed\n");
goto err_free_bus;