test/py: mdio: Add tests for mdio command

Add below test cases for mdio commands:
mdio_list - To list MDIO buses
mdio_read - To read PHY's register at <devad>.<reg>
mdio_write - To write PHY's register at <devad>.<reg>

Signed-off-by: Love Kumar <love.kumar@amd.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

test/py/tests/test_mdio.py

@@ -0,0 +1,79 @@
+# SPDX-License-Identifier: GPL-2.0
+# (C) Copyright 2023, Advanced Micro Devices, Inc.
+
+import pytest
+import re
+
+"""
+Note: This test relies on boardenv_* containing configuration values to define
+the PHY device info including the device name, address, register address/value
+and write data value. This test will be automatically skipped without this.
+
+For example:
+
+# Setup env__mdio_util_test to set the PHY address, device names, register
+# address, register address value, and write data value to test mdio commands.
+# Test will be skipped if env_mdio_util_test is not set
+env__mdio_util_test = {
+    "eth0": {"phy_addr": 0xc, "device_name": "TI DP83867", "reg": 0,
+                 "reg_val": 0x1000, "write_val": 0x100},
+    "eth1": {"phy_addr": 0xa0, "device_name": "TI DP83867", "reg": 1,
+                 "reg_val": 0x2000, "write_val": 0x100},
+}
+"""
+
+def get_mdio_test_env(u_boot_console):
+    f = u_boot_console.config.env.get("env__mdio_util_test", None)
+    if not f or len(f) == 0:
+        pytest.skip("No PHY device to test!")
+    else:
+        return f
+
+@pytest.mark.buildconfigspec("cmd_mii")
+@pytest.mark.buildconfigspec("phylib")
+def test_mdio_list(u_boot_console):
+    f = get_mdio_test_env(u_boot_console)
+    output = u_boot_console.run_command("mdio list")
+    for dev, val in f.items():
+        phy_addr = val.get("phy_addr")
+        dev_name = val.get("device_name")
+
+        assert f"{phy_addr:x} -" in output
+        assert dev_name in output
+
+@pytest.mark.buildconfigspec("cmd_mii")
+@pytest.mark.buildconfigspec("phylib")
+def test_mdio_read(u_boot_console):
+    f = get_mdio_test_env(u_boot_console)
+    output = u_boot_console.run_command("mdio list")
+    for dev, val in f.items():
+        phy_addr = hex(val.get("phy_addr"))
+        dev_name = val.get("device_name")
+        reg = hex(val.get("reg"))
+        reg_val = hex(val.get("reg_val"))
+
+        output = u_boot_console.run_command(f"mdio read {phy_addr} {reg}")
+        assert f"PHY at address {int(phy_addr, 16):x}:" in output
+        assert f"{int(reg, 16):x} - {reg_val}" in output
+
+@pytest.mark.buildconfigspec("cmd_mii")
+@pytest.mark.buildconfigspec("phylib")
+def test_mdio_write(u_boot_console):
+    f = get_mdio_test_env(u_boot_console)
+    output = u_boot_console.run_command("mdio list")
+    for dev, val in f.items():
+        phy_addr = hex(val.get("phy_addr"))
+        dev_name = val.get("device_name")
+        reg = hex(val.get("reg"))
+        reg_val = hex(val.get("reg_val"))
+        wr_val = hex(val.get("write_val"))
+
+        u_boot_console.run_command(f"mdio write {phy_addr} {reg} {wr_val}")
+        output = u_boot_console.run_command(f"mdio read {phy_addr} {reg}")
+        assert f"PHY at address {int(phy_addr, 16):x}:" in output
+        assert f"{int(reg, 16):x} - {wr_val}" in output
+
+        u_boot_console.run_command(f"mdio write {phy_addr} {reg} {reg_val}")
+        output = u_boot_console.run_command(f"mdio read {phy_addr} {reg}")
+        assert f"PHY at address {int(phy_addr, 16):x}:" in output
+        assert f"{int(reg, 16):x} - {reg_val}" in output