[SiVal, pwm] Add testplan with pwm_smoketest

Signed-off-by: Douglas Reis <[email protected]>

hw/top_earlgrey/data/ip/chip_pwm_testplan.hjson

@@ -0,0 +1,23 @@
+// Copyright lowRISC contributors (OpenTitan project).
+// Licensed under the Apache License, Version 2.0, see LICENSE for details.
+// SPDX-License-Identifier: Apache-2.0
+{
+  name: pwm
+  testpoints: [
+    {
+      name: chip_sw_pwm_smoketest
+      desc: '''Verify that the PWM outputs correct wave.
+
+              - Program the PWM to output waves of 1kHz, 5kHz and 10kHz.
+              - Program the duty cycle to 0%, 20%, 50%, 90%, and 100%.
+              - The test harness should check that the frequency and duty cicle is correct.
+            '''
+      features:["PWM.DUTYCYCLE", "PWM.CLOCKDIVIDER"]
+      stage: V3
+      si_stage: SV3
+      lc_states: ["PROD"]
+      tests: []
+      bazel: []
+    }
+  ]
+}