dm: Add a test for of-platdata parent information

Add a simple test that we can obtain the correct parent for an I2C
device. This requires updating the driver names to match the compatible
strings, adding them to the devicetree and enabling a few options.

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

arch/sandbox/dts/sandbox.dts

@@ -69,6 +69,7 @@
 		clock-frequency = <400000>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&pinctrl_i2c0>;
+		u-boot,dm-pre-reloc;
 	};
 
 	pcic: pci@0 {

arch/sandbox/dts/sandbox.dtsi

@@ -90,6 +90,7 @@
 			reg = <0x43>;
 			compatible = "sandbox-rtc";
 			sandbox,emul = <&emul0>;
+			u-boot,dm-pre-reloc;
 		};
 		sandbox_pmic: sandbox_pmic {
 			reg = <0x40>;

configs/sandbox_spl_defconfig

@@ -26,6 +26,8 @@ CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_HANDOFF=y
 CONFIG_SPL_BOARD_INIT=y
 CONFIG_SPL_ENV_SUPPORT=y
+CONFIG_SPL_I2C_SUPPORT=y
+CONFIG_SPL_RTC_SUPPORT=y
 CONFIG_CMD_CPU=y
 CONFIG_CMD_LICENSE=y
 CONFIG_CMD_BOOTZ=y
@@ -120,7 +122,6 @@ CONFIG_I2C_CROS_EC_LDO=y
 CONFIG_DM_I2C_GPIO=y
 CONFIG_SYS_I2C_SANDBOX=y
 CONFIG_I2C_MUX=y
-CONFIG_SPL_I2C_MUX=y
 CONFIG_I2C_ARB_GPIO_CHALLENGE=y
 CONFIG_CROS_EC_KEYB=y
 CONFIG_I8042_KEYB=y
@@ -187,6 +188,7 @@ CONFIG_REMOTEPROC_SANDBOX=y
 CONFIG_DM_RESET=y
 CONFIG_SANDBOX_RESET=y
 CONFIG_DM_RTC=y
+CONFIG_SPL_DM_RTC=y
 CONFIG_SANDBOX_SERIAL=y
 CONFIG_SOUND=y
 CONFIG_SOUND_SANDBOX=y

drivers/i2c/sandbox_i2c.c

@@ -93,8 +93,8 @@ static const struct udevice_id sandbox_i2c_ids[] = {
 	{ }
 };
 
-U_BOOT_DRIVER(i2c_sandbox) = {
-	.name	= "i2c_sandbox",
+U_BOOT_DRIVER(sandbox_i2c) = {
+	.name	= "sandbox_i2c",
 	.id	= UCLASS_I2C,
 	.of_match = sandbox_i2c_ids,
 	.ops	= &sandbox_i2c_ops,

drivers/rtc/sandbox_rtc.c

@@ -92,8 +92,8 @@ static const struct udevice_id sandbox_rtc_ids[] = {
 	{ }
 };
 
-U_BOOT_DRIVER(rtc_sandbox) = {
-	.name	= "rtc-sandbox",
+U_BOOT_DRIVER(sandbox_rtc) = {
+	.name	= "sandbox_rtc",
 	.id	= UCLASS_RTC,
 	.of_match = sandbox_rtc_ids,
 	.ops	= &sandbox_rtc_ops,

test/dm/of_platdata.c

@@ -205,3 +205,18 @@ static int dm_test_of_platdata_phandle(struct unit_test_state *uts)
 	return 0;
 }
 DM_TEST(dm_test_of_platdata_phandle, UT_TESTF_SCAN_PDATA);
+
+#if CONFIG_IS_ENABLED(OF_PLATDATA_PARENT)
+/* Test that device parents are correctly set up */
+static int dm_test_of_platdata_parent(struct unit_test_state *uts)
+{
+	struct udevice *rtc, *i2c;
+
+	ut_assertok(uclass_first_device_err(UCLASS_RTC, &rtc));
+	ut_assertok(uclass_first_device_err(UCLASS_I2C, &i2c));
+	ut_asserteq_ptr(i2c, dev_get_parent(rtc));
+
+	return 0;
+}
+DM_TEST(dm_test_of_platdata_parent, UT_TESTF_SCAN_PDATA);
+#endif