test/py: mii: Add tests for mii command

Add below test cases for mii commands:
mii_info -To display MII PHY info
mii_list - To list MII devices
mii_set_device - To set MII device
mii_read - To reads register from MII PHY address
mii_dump - To display data from MII PHY address

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

test/py/tests/test_mii.py

@@ -0,0 +1,92 @@
+# SPDX-License-Identifier: GPL-2.0
+# (C) Copyright 2023, Advanced Micro Devices, Inc.
+
+import pytest
+import re
+
+"""
+Note: This test doesn't rely on boardenv_* configuration value but they can
+change test behavior.
+
+For example:
+
+# Setup env__mii_deive_test_skip to True if tests with ethernet PHY devices
+# should be skipped. For example: Missing PHY device
+env__mii_device_test_skip = True
+
+# Setup env__mii_device_test to set the MII device names. Test will be skipped
+# if env_mii_device_test is not set
+env__mii_device_test = {
+    'device_list': ['eth0', 'eth1'],
+}
+"""
+
+@pytest.mark.buildconfigspec("cmd_mii")
+def test_mii_info(u_boot_console):
+    if u_boot_console.config.env.get("env__mii_device_test_skip", False):
+        pytest.skip("MII device test is not enabled!")
+    expected_output = "PHY"
+    output = u_boot_console.run_command("mii info")
+    if not re.search(r"PHY (.+?):", output):
+        pytest.skip("PHY device does not exist!")
+    assert expected_output in output
+
+@pytest.mark.buildconfigspec("cmd_mii")
+def test_mii_list(u_boot_console):
+    if u_boot_console.config.env.get("env__mii_device_test_skip", False):
+        pytest.skip("MII device test is not enabled!")
+
+    f = u_boot_console.config.env.get("env__mii_device_test", None)
+    if not f:
+        pytest.skip("No MII device to test!")
+
+    dev_list = f.get("device_list")
+    if not dev_list:
+        pytest.fail("No MII device list provided via env__mii_device_test!")
+
+    expected_output = "Current device"
+    output = u_boot_console.run_command("mii device")
+    mii_devices = (
+        re.search(r"MII devices: '(.+)'", output).groups()[0].replace("'", "").split()
+    )
+
+    assert len([x for x in dev_list if x in mii_devices]) == len(dev_list)
+    assert expected_output in output
+
+@pytest.mark.buildconfigspec("cmd_mii")
+def test_mii_set_device(u_boot_console):
+    test_mii_list(u_boot_console)
+    f = u_boot_console.config.env.get("env__mii_device_test", None)
+    dev_list = f.get("device_list")
+    output = u_boot_console.run_command("mii device")
+    current_dev = re.search(r"Current device: '(.+?)'", output).groups()[0]
+
+    for dev in dev_list:
+        u_boot_console.run_command(f"mii device {dev}")
+        output = u_boot_console.run_command("echo $?")
+        assert output.endswith("0")
+
+    u_boot_console.run_command(f"mii device {current_dev}")
+    output = u_boot_console.run_command("mii device")
+    dev = re.search(r"Current device: '(.+?)'", output).groups()[0]
+    assert current_dev == dev
+
+@pytest.mark.buildconfigspec("cmd_mii")
+def test_mii_read(u_boot_console):
+    test_mii_list(u_boot_console)
+    output = u_boot_console.run_command("mii info")
+    eth_addr = hex(int(re.search(r"PHY (.+?):", output).groups()[0], 16))
+    u_boot_console.run_command(f"mii read {eth_addr} 0")
+    output = u_boot_console.run_command("echo $?")
+    assert output.endswith("0")
+
+@pytest.mark.buildconfigspec("cmd_mii")
+def test_mii_dump(u_boot_console):
+    test_mii_list(u_boot_console)
+    expected_response = "PHY control register"
+    output = u_boot_console.run_command("mii info")
+    eth_addr = hex(int(re.search(r"PHY (.+?):", output).groups()[0], 16))
+    response = u_boot_console.run_command(f"mii dump {eth_addr} 0")
+    assert expected_response in response
+    output = u_boot_console.run_command("echo $?")
+    assert output.endswith("0")