dm: test: Add a test for of-platdata phandles

We have a test in dtoc for this feature, but not one in U-Boot itself.
Add a simple test that checks that the information comes through
correctly.

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

arch/sandbox/dts/sandbox.dtsi

@@ -29,6 +29,32 @@
 		};
 	};
 
+	clk_fixed: clk-fixed {
+		u-boot,dm-pre-reloc;
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <1234>;
+	};
+
+	clk_sandbox: clk-sbox {
+		u-boot,dm-pre-reloc;
+		compatible = "sandbox,clk";
+		#clock-cells = <1>;
+		assigned-clocks = <&clk_sandbox 3>;
+		assigned-clock-rates = <321>;
+	};
+
+	clk-test {
+		u-boot,dm-pre-reloc;
+		compatible = "sandbox,clk-test";
+		clocks = <&clk_fixed>,
+			 <&clk_sandbox 1>,
+			 <&clk_sandbox 0>,
+			 <&clk_sandbox 3>,
+			 <&clk_sandbox 2>;
+		clock-names = "fixed", "i2c", "spi", "uart2", "uart1";
+	};
+
 	gpio_a: gpios@0 {
 		u-boot,dm-pre-reloc;
 		gpio-controller;

configs/sandbox_spl_defconfig

@@ -104,6 +104,7 @@ CONFIG_ADC_SANDBOX=y
 CONFIG_AXI=y
 CONFIG_AXI_SANDBOX=y
 CONFIG_CLK=y
+CONFIG_SPL_CLK=y
 CONFIG_CPU=y
 CONFIG_DM_DEMO=y
 CONFIG_DM_DEMO_SIMPLE=y

drivers/clk/clk_fixed_rate.c

@@ -46,8 +46,8 @@ static const struct udevice_id clk_fixed_rate_match[] = {
 	{ /* sentinel */ }
 };
 
-U_BOOT_DRIVER(clk_fixed_rate) = {
+U_BOOT_DRIVER(fixed_clock) = {
-	.name = "fixed_rate_clock",
+	.name = "fixed_clock",
 	.id = UCLASS_CLK,
 	.of_match = clk_fixed_rate_match,
 	.ofdata_to_platdata = clk_fixed_rate_ofdata_to_platdata,

drivers/clk/clk_sandbox.c

@@ -124,8 +124,8 @@ static const struct udevice_id sandbox_clk_ids[] = {
 	{ }
 };
 
-U_BOOT_DRIVER(clk_sandbox) = {
+U_BOOT_DRIVER(sandbox_clk) = {
-	.name		= "clk_sandbox",
+	.name		= "sandbox_clk",
 	.id		= UCLASS_CLK,
 	.of_match	= sandbox_clk_ids,
 	.ops		= &sandbox_clk_ops,

test/dm/of_platdata.c

@@ -26,7 +26,11 @@ static int dm_test_of_platdata_props(struct unit_test_state *uts)
 	struct udevice *dev;
 	int i;
 
+	/* Skip the clock */
 	ut_assertok(uclass_first_device_err(UCLASS_MISC, &dev));
+	ut_asserteq_str("sandbox_clk_test", dev->name);
+
+	ut_assertok(uclass_next_device_err(&dev));
 	plat = dev_get_platdata(dev);
 	ut_assert(plat->boolval);
 	ut_asserteq(1, plat->intval);
@@ -167,3 +171,36 @@ static int dm_test_of_platdata_dev(struct unit_test_state *uts)
 	return 0;
 }
 DM_TEST(dm_test_of_platdata_dev, UT_TESTF_SCAN_PDATA);
+
+/* Test handling of phandles that point to other devices */
+static int dm_test_of_platdata_phandle(struct unit_test_state *uts)
+{
+	struct dtd_sandbox_clk_test *plat;
+	struct udevice *dev, *clk;
+
+	ut_assertok(uclass_first_device_err(UCLASS_MISC, &dev));
+	ut_asserteq_str("sandbox_clk_test", dev->name);
+	plat = dev_get_platdata(dev);
+
+	ut_assertok(device_get_by_driver_info(plat->clocks[0].node, &clk));
+	ut_asserteq_str("fixed_clock", clk->name);
+
+	ut_assertok(device_get_by_driver_info(plat->clocks[1].node, &clk));
+	ut_asserteq_str("sandbox_clk", clk->name);
+	ut_asserteq(1, plat->clocks[1].arg[0]);
+
+	ut_assertok(device_get_by_driver_info(plat->clocks[2].node, &clk));
+	ut_asserteq_str("sandbox_clk", clk->name);
+	ut_asserteq(0, plat->clocks[2].arg[0]);
+
+	ut_assertok(device_get_by_driver_info(plat->clocks[3].node, &clk));
+	ut_asserteq_str("sandbox_clk", clk->name);
+	ut_asserteq(3, plat->clocks[3].arg[0]);
+
+	ut_assertok(device_get_by_driver_info(plat->clocks[4].node, &clk));
+	ut_asserteq_str("sandbox_clk", clk->name);
+	ut_asserteq(2, plat->clocks[4].arg[0]);
+
+	return 0;
+}
+DM_TEST(dm_test_of_platdata_phandle, UT_TESTF_SCAN_PDATA);