test/py: i2c: Add tests for i2c command

Add below test cases for i2c commands:
i2c_bus - To show i2c bus info,
i2c_dev - To set or show the current bus,
i2c_probe - To probe the i2c device,
i2c_eeprom - To test i2c eeprom device,
i2c_probe_all_buses - To list down all the buses and probes it

Signed-off-by: Love Kumar <love.kumar@amd.com>

test/py/tests/test_i2c.py

@@ -0,0 +1,116 @@
+# SPDX-License-Identifier: GPL-2.0
+# (C) Copyright 2023, Advanced Micro Devices, Inc.
+
+import pytest
+import random
+import re
+
+"""
+Note: This test relies on boardenv_* containing configuration values to define
+the i2c device info including the bus list and eeprom address/value. This test
+will be automatically skipped without this.
+
+For example:
+
+# Setup env__i2c_device_test to set the i2c bus list and probe_all boolean
+# parameter. For i2c_probe_all_buses case, if probe_all parameter is set to
+# False then it probes all the buses listed in bus_list instead of probing all
+# the buses available.
+env__i2c_device_test = {
+    'bus_list': [0, 2, 5, 12, 16, 18],
+    'probe_all': False,
+}
+
+# Setup env__i2c_eeprom_device_test to set the i2c bus number, eeprom address
+# and configured value for i2c_eeprom test case. Test will be skipped if
+# env__i2c_eeprom_device_test is not set
+env__i2c_eeprom_device_test = {
+    'bus': 3,
+    'eeprom_addr': 0x54,
+    'eeprom_val': '30 31',
+}
+"""
+
+def get_i2c_test_env(u_boot_console):
+    f = u_boot_console.config.env.get("env__i2c_device_test", None)
+    if not f:
+        pytest.skip("No I2C device to test!")
+    else:
+        bus_list = f.get("bus_list", None)
+        if not bus_list:
+            pytest.skip("I2C bus list is not provided!")
+        probe_all = f.get("probe_all", False)
+        return bus_list, probe_all
+
+@pytest.mark.buildconfigspec("cmd_i2c")
+def test_i2c_bus(u_boot_console):
+    bus_list, probe = get_i2c_test_env(u_boot_console)
+    bus = random.choice(bus_list)
+    expected_response = f"Bus {bus}:"
+    response = u_boot_console.run_command("i2c bus")
+    assert expected_response in response
+
+@pytest.mark.buildconfigspec("cmd_i2c")
+def test_i2c_dev(u_boot_console):
+    bus_list, probe = get_i2c_test_env(u_boot_console)
+    expected_response = "Current bus is"
+    response = u_boot_console.run_command("i2c dev")
+    assert expected_response in response
+
+@pytest.mark.buildconfigspec("cmd_i2c")
+def test_i2c_probe(u_boot_console):
+    bus_list, probe = get_i2c_test_env(u_boot_console)
+    bus = random.choice(bus_list)
+    expected_response = f"Setting bus to {bus}"
+    response = u_boot_console.run_command(f"i2c dev {bus}")
+    assert expected_response in response
+    expected_response = "Valid chip addresses:"
+    response = u_boot_console.run_command("i2c probe")
+    assert expected_response in response
+
+@pytest.mark.buildconfigspec("cmd_i2c")
+def test_i2c_eeprom(u_boot_console):
+    f = u_boot_console.config.env.get("env__i2c_eeprom_device_test", None)
+    if not f:
+        pytest.skip("No I2C eeprom to test!")
+
+    bus = f.get("bus", 0)
+    if bus < 0:
+        pytest.fail("No bus specified via env__i2c_eeprom_device_test!")
+
+    addr = f.get("eeprom_addr", -1)
+    if addr < 0:
+        pytest.fail("No eeprom address specified via env__i2c_eeprom_device_test!")
+
+    value = f.get("eeprom_val")
+    if not value:
+        pytest.fail(
+            "No eeprom configured value provided via env__i2c_eeprom_device_test!"
+        )
+
+    # Enable i2c mux bridge
+    u_boot_console.run_command("i2c dev %x" % bus)
+    u_boot_console.run_command("i2c probe")
+    output = u_boot_console.run_command("i2c md %x 0 5" % addr)
+    assert value in output
+
+@pytest.mark.buildconfigspec("cmd_i2c")
+def test_i2c_probe_all_buses(u_boot_console):
+    bus_list, probe = get_i2c_test_env(u_boot_console)
+    bus = random.choice(bus_list)
+    expected_response = f"Bus {bus}:"
+    response = u_boot_console.run_command("i2c bus")
+    assert expected_response in response
+
+    # Get all the bus list
+    if probe:
+        buses = re.findall("Bus (.+?):", response)
+        bus_list = [int(x) for x in buses]
+
+    for dev in bus_list:
+        expected_response = f"Setting bus to {dev}"
+        response = u_boot_console.run_command(f"i2c dev {dev}")
+        assert expected_response in response
+        expected_response = "Valid chip addresses:"
+        response = u_boot_console.run_command("i2c probe")
+        assert expected_response in response