dm: acpi: Enhance acpi_get_name()

For many device types it is possible to figure out the name just by
looking at its uclass or parent. Add a function to handle this, since it
allows us to cover the vast majority of cases automatically.

However it is sometimes impossible to figure out an ACPI name for a device
just by looking at its uclass. For example a touch device may have a
vendor-specific name. Add a new "acpi,name" property to allow a custom
name to be created.

With this new feature we can drop the get_name() methods in the sandbox
I2C and SPI drivers. They were only added for testing purposes. Update the
tests to use the new values.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

1 files changed, 41 insertions, 1 deletions

diff --git a/test/dm/acpi.c b/test/dm/acpi.c
index 1abde65..69ca090 100644
--- a/test/dm/acpi.c
+++ b/test/dm/acpi.c
@@ -124,12 +124,52 @@ UCLASS_DRIVER(testacpi) = {
 static int dm_test_acpi_get_name(struct unit_test_state *uts)
 {
 	char name[ACPI_NAME_MAX];
-	struct udevice *dev;
+	struct udevice *dev, *dev2, *i2c, *spi, *serial, *timer, *sound;
+	struct udevice *pci, *root;
 
+	/* Test getting the name from the driver */
 	ut_assertok(uclass_first_device_err(UCLASS_TEST_ACPI, &dev));
 	ut_assertok(acpi_get_name(dev, name));
 	ut_asserteq_str(ACPI_TEST_DEV_NAME, name);
 
+	/* Test getting the name from the device tree */
+	ut_assertok(uclass_get_device_by_name(UCLASS_TEST_FDT, "a-test",
+					      &dev2));
+	ut_assertok(acpi_get_name(dev2, name));
+	ut_asserteq_str("GHIJ", name);
+
+	/* Test getting the name from acpi_device_get_name() */
+	ut_assertok(uclass_first_device(UCLASS_I2C, &i2c));
+	ut_assertok(acpi_get_name(i2c, name));
+	ut_asserteq_str("I2C0", name);
+
+	ut_assertok(uclass_first_device(UCLASS_SPI, &spi));
+	ut_assertok(acpi_get_name(spi, name));
+	ut_asserteq_str("SPI0", name);
+
+	/* The uart has no sequence number, so this should fail */
+	ut_assertok(uclass_first_device(UCLASS_SERIAL, &serial));
+	ut_asserteq(-ENXIO, acpi_get_name(serial, name));
+
+	/* ACPI doesn't know about the timer */
+	ut_assertok(uclass_first_device(UCLASS_TIMER, &timer));
+	ut_asserteq(-ENOENT, acpi_get_name(timer, name));
+
+	/* May as well test the rest of the cases */
+	ut_assertok(uclass_first_device(UCLASS_SOUND, &sound));
+	ut_assertok(acpi_get_name(sound, name));
+	ut_asserteq_str("HDAS", name);
+
+	ut_assertok(uclass_first_device(UCLASS_PCI, &pci));
+	ut_assertok(acpi_get_name(pci, name));
+	ut_asserteq_str("PCI0", name);
+
+	ut_assertok(uclass_first_device(UCLASS_ROOT, &root));
+	ut_assertok(acpi_get_name(root, name));
+	ut_asserteq_str("\\_SB", name);
+
+	/* Note that we don't have tests for acpi_name_from_id() */
+
 	return 0;
 }
 DM_TEST(dm_test_acpi_get_name, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);