dm: test: Add tests for the clk uclass

Add tests of each API call using a sandbox clock device.

Signed-off-by: Simon Glass <sjg@chromium.org>

test/dm/clk.c

@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2015 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <asm/test.h>
+#include <dm/test.h>
+#include <linux/err.h>
+#include <test/ut.h>
+
+/* Test that we can find and adjust clocks */
+static int dm_test_clk_base(struct unit_test_state *uts)
+{
+	struct udevice *clk;
+	ulong rate;
+
+	ut_assertok(uclass_get_device(UCLASS_CLK, 0, &clk));
+	rate = clk_get_rate(clk);
+	ut_asserteq(SANDBOX_CLK_RATE, rate);
+	ut_asserteq(-EINVAL, clk_set_rate(clk, 0));
+	ut_assertok(clk_set_rate(clk, rate * 2));
+	ut_asserteq(SANDBOX_CLK_RATE * 2, clk_get_rate(clk));
+
+	return 0;
+}
+DM_TEST(dm_test_clk_base, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+
+/* Test that peripheral clocks work as expected */
+static int dm_test_clk_periph(struct unit_test_state *uts)
+{
+	struct udevice *clk;
+	ulong rate;
+
+	ut_assertok(uclass_get_device(UCLASS_CLK, 0, &clk));
+	rate = clk_set_periph_rate(clk, PERIPH_ID_COUNT, 123);
+	ut_asserteq(-EINVAL, rate);
+	ut_asserteq(1, IS_ERR_VALUE(rate));
+
+	rate = clk_set_periph_rate(clk, PERIPH_ID_SPI, 123);
+	ut_asserteq(0, rate);
+	ut_asserteq(123, clk_get_periph_rate(clk, PERIPH_ID_SPI));
+
+	rate = clk_set_periph_rate(clk, PERIPH_ID_SPI, 1234);
+	ut_asserteq(123, rate);
+
+	rate = clk_set_periph_rate(clk, PERIPH_ID_I2C, 567);
+
+	rate = clk_set_periph_rate(clk, PERIPH_ID_SPI, 1234);
+	ut_asserteq(1234, rate);
+
+	ut_asserteq(567, clk_get_periph_rate(clk, PERIPH_ID_I2C));
+
+	return 0;
+}
+DM_TEST(dm_test_clk_periph, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);