clk: gate: Add some kunit test suites

Test various parts of the clk gate implementation with the kunit testing
framework.

Reviewed-by: Brendan Higgins <[email protected]>
Acked-by: Daniel Latypov <[email protected]>
Cc: <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: bebarino

drivers/clk/.kunitconfig

@@ -0,0 +1,3 @@
+CONFIG_KUNIT=y
+CONFIG_COMMON_CLK=y
+CONFIG_CLK_GATE_KUNIT_TEST=y

drivers/clk/Kconfig

@@ -428,4 +428,12 @@ source "drivers/clk/x86/Kconfig"
 source "drivers/clk/xilinx/Kconfig"
 source "drivers/clk/zynqmp/Kconfig"
 
+# Kunit test cases
+config CLK_GATE_KUNIT_TEST
+	tristate "Basic gate type Kunit test" if !KUNIT_ALL_TESTS
+	depends on KUNIT
+	default KUNIT_ALL_TESTS
+	help
+	  Kunit test for the basic clk gate type.
+
 endif

drivers/clk/Makefile

@@ -6,6 +6,7 @@ obj-$(CONFIG_COMMON_CLK)	+= clk-divider.o
 obj-$(CONFIG_COMMON_CLK)	+= clk-fixed-factor.o
 obj-$(CONFIG_COMMON_CLK)	+= clk-fixed-rate.o
 obj-$(CONFIG_COMMON_CLK)	+= clk-gate.o
+obj-$(CONFIG_CLK_GATE_KUNIT_TEST) += clk-gate_test.o
 obj-$(CONFIG_COMMON_CLK)	+= clk-multiplier.o
 obj-$(CONFIG_COMMON_CLK)	+= clk-mux.o
 obj-$(CONFIG_COMMON_CLK)	+= clk-composite.o