On 9/20/21 5:34 AM, Rafał Miłecki wrote:
> From: Rafał Miłecki <rafal@xxxxxxxxxx>
>
> 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 which has an MDIO attached
> switch.
>
> Signed-off-by: Rafał Miłecki <rafal@xxxxxxxxxx>
> ---
> drivers/net/ethernet/broadcom/bgmac-bcma-mdio.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/broadcom/bgmac-bcma-mdio.c b/drivers/net/ethernet/broadcom/bgmac-bcma-mdio.c
> index 6ce80cbcb48e..086739e4f40a 100644
> --- a/drivers/net/ethernet/broadcom/bgmac-bcma-mdio.c
> +++ b/drivers/net/ethernet/broadcom/bgmac-bcma-mdio.c
> @@ -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");
I believe this leaks np and the use case is not exactly clear to me
here. AFAICT the Northstar SoCs have two MDIO controllers: one for
internal PHYs and one for external PHYs which how you would attach a
switch to the chip (in chipcommonA). Is 53573 somewhat different here?
What is the MDIO bus driver that is being used?
--
Florian
