dm: Simple Watchdog uclass

This is a simple uclass for Watchdog Timers. It has four operations:
start, restart, reset, stop. Drivers must implement start, restart and
stop operations, while implementing reset is optional: It's default
implementation expires watchdog timer in one clock tick.

Signed-off-by: Maxim Sloyko <maxims@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

2 files changed, 41 insertions, 0 deletions

diff --git a/test/dm/Makefile b/test/dm/Makefile
index e956915bc3d..b15f1d0535a 100644
--- a/test/dm/Makefile
+++ b/test/dm/Makefile
@@ -42,4 +42,5 @@ obj-$(CONFIG_TIMER) += timer.o
 obj-$(CONFIG_DM_VIDEO) += video.o
 obj-$(CONFIG_ADC) += adc.o
 obj-$(CONFIG_SPMI) += spmi.o
+obj-$(CONFIG_WDT) += wdt.o
 endif
diff --git a/test/dm/wdt.c b/test/dm/wdt.c
new file mode 100644
index 00000000000..2ecfceaaff9
--- /dev/null
+++ b/test/dm/wdt.c
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2017 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <wdt.h>
+#include <asm/state.h>
+#include <asm/test.h>
+#include <dm/test.h>
+#include <test/ut.h>
+
+/* Test that watchdog driver functions are called */
+static int dm_test_wdt_base(struct unit_test_state *uts)
+{
+	struct sandbox_state *state = state_get_current();
+	struct udevice *dev;
+	const u64 timeout = 42;
+
+	ut_assertok(uclass_get_device(UCLASS_WDT, 0, &dev));
+	ut_asserteq(0, state->wdt.counter);
+	ut_asserteq(false, state->wdt.running);
+
+	ut_assertok(wdt_start(dev, timeout, 0));
+	ut_asserteq(timeout, state->wdt.counter);
+	ut_asserteq(true, state->wdt.running);
+
+	uint reset_count = state->wdt.reset_count;
+	ut_assertok(wdt_reset(dev));
+	ut_asserteq(reset_count + 1, state->wdt.reset_count);
+	ut_asserteq(true, state->wdt.running);
+
+	ut_assertok(wdt_stop(dev));
+	ut_asserteq(false, state->wdt.running);
+
+	return 0;
+}
+DM_TEST(dm_test_wdt_base, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);