[U-Boot] mdio error on ar9344

Hi, I am using device based on Atheros AR9344.

When U-Boot initialize net device I get error mdio_register: non unique device name 'gmac0'

dm tree command shows that eth_ag7xxx is not probed.

ag7xxx_eth_probe -> ag7xxx_mac_probe -> ag933x_phy_setup -> ag933x_phy_setup_reset_set -> ag7xxx_mdio_write -> ag7xxx_mdio_rw return -ETIMEDOUT

because ag7xxx_switch_reg_read return 0xFFFFFFFF, see below

static int ag7xxx_mdio_rw(struct mii_dev *bus, int addr, int reg, u32 val) {         u32 data;         unsigned long start;         int ret;         // No idea if this is long enough or too long         int timeout_ms = 1000;

// Dummy read followed by PHY read/write command.         ret = ag7xxx_switch_reg_read(bus, 0x98, &data);         if (ret < 0)                 return ret;         data = val | (reg << 16) | (addr << 21) | BIT(30) | BIT(31);         ret = ag7xxx_switch_reg_write(bus, 0x98, data);         if (ret < 0)                 return ret;

start = get_timer(0);

// Wait for operation to finish         do {                 ret = ag7xxx_switch_reg_read(bus, 0x98, &data);                 if (ret < 0)                         return ret;                 if (get_timer(start) > timeout_ms)                         return -ETIMEDOUT;         } while (data & BIT(31));           return data & 0xffff; }

I use tplink_wdr4320 u-boot profile for my device.