test: regmap: add regmap_read_poll_timeout test

Add test to regmap_read_poll_timeout() helper to check the timeout works
properly but cannot test proper condition matching since read/write calls
are not executed in sandbox.
Tested-by: NJerome Brunet <jbrunet@baylibre.com>
Acked-by: NJagan Teki <jagan@openedev.com>
Signed-off-by: NNeil Armstrong <narmstrong@baylibre.com>

test/dm/regmap.c

@@ -144,3 +144,29 @@ static int dm_test_regmap_getset(struct unit_test_state *uts)
 }
 
 DM_TEST(dm_test_regmap_getset, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+
+/* Read polling test */
+static int dm_test_regmap_poll(struct unit_test_state *uts)
+{
+	struct udevice *dev;
+	struct regmap *map;
+	uint reg;
+	unsigned long start;
+
+	ut_assertok(uclass_get_device(UCLASS_SYSCON, 0, &dev));
+	map = syscon_get_regmap(dev);
+	ut_assertok_ptr(map);
+
+	start = get_timer(0);
+
+	ut_asserteq(-ETIMEDOUT,
+		    regmap_read_poll_timeout(map, 0, reg,
+					     (reg == 0xcacafafa),
+					     1, 5 * CONFIG_SYS_HZ));
+
+	ut_assert(get_timer(start) > (5 * CONFIG_SYS_HZ));
+
+	return 0;
+}
+
+DM_TEST(dm_test_regmap_poll, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);