[PATCH v2 5/5] tests/functional/aarch64: add raspi4b RNG200/thermal test

[Marcelo Manzo <marcelomanzo@gmail.com>]

Extend test_arm_raspi4_initrd to exercise the RNG200 and thermal
sensor devices added in this series: confirm the RNG200 driver probes
it ("hwrng registered" in the kernel log), then once at a shell
confirm the thermal zone reports the expected fixed reading and that
/dev/hwrng actually yields data rather than just existing.

These checks go into the existing initrd boot test rather than a new
test, to avoid spending test time booting the same kernel again.

Verified locally against this series with the exact kernel/initrd
assets this file already pins.

Signed-off-by: Marcelo Manzo <marcelomanzo@gmail.com>
---
 tests/functional/aarch64/test_raspi4.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tests/functional/aarch64/test_raspi4.py b/tests/functional/aarch64/test_raspi4.py
index bacecbbe9c..c61014b5fa 100755
--- a/tests/functional/aarch64/test_raspi4.py
+++ b/tests/functional/aarch64/test_raspi4.py
@@ -80,6 +80,8 @@ def test_arm_raspi4_initrd(self):
         #                '-device', 'qemu-xhci,bus=pcie.1,id=xhci',
         #                '-device', 'usb-kbd,bus=xhci.0',
         self.vm.launch()
+        self.wait_for_console_pattern(
+            'iproc-rng200 fe104000.rng: hwrng registered')
         self.wait_for_console_pattern('Boot successful.')
 
         exec_command_and_wait_for_pattern(self, 'cat /proc/cpuinfo',
@@ -103,6 +105,11 @@ def test_arm_raspi4_initrd(self):
                            'memory node above the 1 GiB peripheral hole '
                            'is probably not being added' % mem_total_kb)
 
+        exec_command_and_wait_for_pattern(
+            self, 'cat /sys/devices/virtual/thermal/thermal_zone0/temp',
+            '25310')
+        exec_command_and_wait_for_pattern(self, 'head -c 8 /dev/hwrng | xxd',
+                                                '00000000:')
         exec_command_and_wait_for_pattern(self, 'halt', 'reboot: System halted')
         # TODO: Raspberry Pi4 doesn't shut down properly with recent kernels
         # Wait for VM to shut down gracefully
-- 
2.55.0