[PATCH v2] test/py: i2c: Add tests for i2c command

[Love Kumar]

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 at amd.com>
---
Changes in v2:
- Take the configured eeprom value from env to read back and compare
---
 test/py/tests/test_i2c.py | 108 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 test/py/tests/test_i2c.py

diff --git a/test/py/tests/test_i2c.py b/test/py/tests/test_i2c.py
new file mode 100644
index 000000000000..75321ee2fc20
--- /dev/null
+++ b/test/py/tests/test_i2c.py
@@ -0,0 +1,108 @@
+# SPDX-License-Identifier: GPL-2.0
+# (C) Copyright 2023, Advanced Micro Devices, Inc.
+
+import pytest
+import random
+import re
+
+"""
+Note: This test doesn't rely on boardenv_* configuration value but they can
+change test behavior.
+
+For example:
+
+# Setup env__i2c_device_test_skip to True if tests with i2c devices should be
+# skipped. For example: Missing QEMU model or broken i2c device
+env__i2c_device_test_skip = True
+
+# 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",
+}
+
+# Setup env__i2c_device_test to provide the i2c bus list to test against it
+# for i2c_probe_all_buses case instead of probing all the buses available. If
+# it is not set, it list down all the buses and probes it
+env__i2c_device_test = {
+    "bus_list": [0, 2, 5, 12, 16, 18]
+}
+"""
+
+ at pytest.mark.buildconfigspec("cmd_i2c")
+def test_i2c_bus(u_boot_console):
+    if u_boot_console.config.env.get("env__i2c_device_test_skip", False):
+        pytest.skip("I2C device test is not enabled!")
+    expected_response = "Bus"
+    response = u_boot_console.run_command("i2c bus")
+    assert expected_response in response
+
+ at pytest.mark.buildconfigspec("cmd_i2c")
+def test_i2c_dev(u_boot_console):
+    if u_boot_console.config.env.get("env__i2c_device_test_skip", False):
+        pytest.skip("I2C device test is not enabled!")
+    expected_response = "Current bus"
+    response = u_boot_console.run_command("i2c dev")
+    assert expected_response in response
+
+ at pytest.mark.buildconfigspec("cmd_i2c")
+def test_i2c_probe(u_boot_console):
+    if u_boot_console.config.env.get("env__i2c_device_test_skip", False):
+        pytest.skip("I2C device test is not enabled!")
+    expected_response = "Setting bus to 0"
+    response = u_boot_console.run_command("i2c dev 0")
+    assert expected_response in response
+    expected_response = "Valid chip addresses:"
+    response = u_boot_console.run_command("i2c probe")
+    assert expected_response in response
+
+ at 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
+
+ at pytest.mark.buildconfigspec("cmd_i2c")
+def test_i2c_probe_all_buses(u_boot_console):
+    if u_boot_console.config.env.get("env__i2c_device_test_skip", False):
+        pytest.skip("I2C device test is not enabled!")
+    expected_response = "Bus"
+    response = u_boot_console.run_command("i2c bus")
+    assert expected_response in response
+
+    # Get all the bus list
+    f = u_boot_console.config.env.get("env__i2c_device_test", None)
+    if f:
+        bus_list = f.get("bus_list")
+    else:
+        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
-- 
2.25.1