sandbox: clk: add clk enable/disable test code

Since we added clk enable_count and prograte clk child enabling
operation to clk parent, so add a new function sandbox_clk_enable_count
to get enable_count for test usage.

And add test code to get the enable_count after we enable/disable
the device clk.

Signed-off-by: Peng Fan <peng.fan@nxp.com>

drivers/clk/clk_sandbox_ccf.c

@@ -25,6 +25,18 @@ struct clk_pllv3 {
 	u32		div_shift;
 };
 
+int sandbox_clk_enable_count(struct clk *clk)
+{
+	struct clk *clkp = NULL;
+	int ret;
+
+	ret = clk_get_by_id(clk->id, &clkp);
+	if (ret)
+		return 0;
+
+	return clkp->enable_count;
+}
+
 static ulong clk_pllv3_get_rate(struct clk *clk)
 {
 	unsigned long parent_rate = clk_get_parent_rate(clk);
@@ -254,6 +266,9 @@ static int sandbox_clk_ccf_probe(struct udevice *dev)
 	       sandbox_clk_composite("i2c", i2c_sels, ARRAY_SIZE(i2c_sels),
 				     &reg, 0));
 
+	clk_dm(SANDBOX_CLK_I2C_ROOT,
+	       sandbox_clk_gate2("i2c_root", "i2c", base + 0x7c, 0));
+
 	return 0;
 }
 

include/sandbox-clk.h

@@ -20,6 +20,7 @@ enum {
 	SANDBOX_CLK_USDHC1_SEL,
 	SANDBOX_CLK_USDHC2_SEL,
 	SANDBOX_CLK_I2C,
+	SANDBOX_CLK_I2C_ROOT,
 };
 
 enum sandbox_pllv3_type {
@@ -74,4 +75,6 @@ static inline struct clk *sandbox_clk_mux(const char *name, void __iomem *reg,
 				width, 0);
 }
 
+int sandbox_clk_enable_count(struct clk *clk);
+
 #endif /* __SANDBOX_CLK_H__ */

test/dm/clk_ccf.c

@@ -64,6 +64,34 @@ static int dm_test_clk_ccf(struct unit_test_state *uts)
 	rate = clk_get_rate(clk);
 	ut_asserteq(rate, 60000000);
 
+#if CONFIG_IS_ENABLED(CLK_CCF)
+	/* Test clk tree enable/disable */
+	ret = clk_get_by_id(SANDBOX_CLK_I2C_ROOT, &clk);
+	ut_assertok(ret);
+	ut_asserteq_str("i2c_root", clk->dev->name);
+
+	ret = clk_enable(clk);
+	ut_assertok(ret);
+
+	ret = sandbox_clk_enable_count(clk);
+	ut_asserteq(ret, 1);
+
+	ret = clk_get_by_id(SANDBOX_CLK_I2C, &pclk);
+	ut_assertok(ret);
+
+	ret = sandbox_clk_enable_count(pclk);
+	ut_asserteq(ret, 1);
+
+	ret = clk_disable(clk);
+	ut_assertok(ret);
+
+	ret = sandbox_clk_enable_count(clk);
+	ut_asserteq(ret, 0);
+
+	ret = sandbox_clk_enable_count(pclk);
+	ut_asserteq(ret, 0);
+#endif
+
 	return 1;
 }