[PATCH v2 22/25] tests/functional/arm: catalina: test TMP75

Extend the Catalina boot test to exercise the TMP75 sensor on i2c9:
confirm the guest exposes it through hwmon, then drive the temperature
over QOM and check hwmon reports the injected value back.

Address the sensor through the device locator rather than a hardcoded
QOM path.

Signed-off-by: Emmanuel Blot <[email protected]>
---
 tests/functional/arm/test_aspeed_catalina.py | 37 +++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/tests/functional/arm/test_aspeed_catalina.py b/tests/functional/arm/test_aspeed_catalina.py
index dc2f24e7b43..b80b5fe92b7 100755
--- a/tests/functional/arm/test_aspeed_catalina.py
+++ b/tests/functional/arm/test_aspeed_catalina.py
@@ -4,16 +4,30 @@
 #
 # SPDX-License-Identifier: GPL-2.0-or-later
 
+import sys
+
 from qemu_test import Asset
+from qemu_test import exec_command_and_wait_for_pattern
 from aspeed import AspeedTest
 
+# DeviceLocator's type hints require Python 3.10+; import it only when
+# available. On the 3.9 baseline the module still loads and the boot
+# test still runs; only the locator-based device checks are skipped.
+if sys.version_info >= (3, 10):
+    from qemu_test.locator import DeviceLocator
+
 
 class CatalinaMachine(AspeedTest):
 
     ASSET_CATALINA_FLASH = Asset(
-        'https://github.com/legoater/qemu-aspeed-boot/raw/a866feb5ef81245b4827a214584bf6bcc72939f6/images/catalina-bmc/obmc-phosphor-image-catalina-20250619123021.static.mtd.xz',
+        'https://github.com/legoater/qemu-aspeed-boot/raw/a866feb5ef81245b4827a214584bf6bcc72939f6/images/'
+            'catalina-bmc/obmc-phosphor-image-catalina-20250619123021.static.mtd.xz',
         '287402e1ba021991e06be1d098f509444a02a3d81a73a932f66528b159e864f9')
 
+    TMP75_LOCATOR = "/machine/soc::aspeed.i2c-ast2600[0]~i2c[9]~tmp75@0x4b"
+    TMP75_HWMON = "/sys/bus/i2c/devices/9-004b/hwmon/hwmon*"
+    PROMPT = "root@catalina:~#"
+
     def test_arm_ast2600_catalina_openbmc(self):
         image_path = self.uncompress(self.ASSET_CATALINA_FLASH)
 
@@ -21,5 +35,26 @@ def test_arm_ast2600_catalina_openbmc(self):
                                         uboot='2019.04', cpu_id='0xf00',
                                         soc='AST2600 rev A3')
 
+        exec_command_and_wait_for_pattern(self, 'root', 'Password:')
+        exec_command_and_wait_for_pattern(self, '0penBmc', self.PROMPT)
+
+        self.assertIn(b"tmp75", self.read_hwmon(self.TMP75_HWMON, "name"))
+
+        # The QOM round-trips below resolve devices with DeviceLocator, which
+        # require Python 3.10+; skip just those on older interpreters.
+        if sys.version_info < (3, 10):
+            return
+
+        tmp75 = DeviceLocator(self.vm.cmd).resolve(self.TMP75_LOCATOR, "tmp75")
+
+        # temp1_input reports the temperature in millidegrees Celsius. Drive it
+        # through QOM (units of 0.001 C) and check the kernel hwmon interface
+        # reports the injected value back.
+        for milli_c in (55000, 30000):
+            self.vm.cmd("qom-set", path=tmp75,
+                        property="temperature", value=milli_c)
+            self.wait_hwmon_value(self.TMP75_HWMON, "temp1_input", milli_c)
+
+
 if __name__ == '__main__':
     AspeedTest.main()

-- 
2.50.1