ACPI / scan: Rename acpi_is_serial_bus_slave() for more general use

Currently the ACPI scan has special handling for serial bus slaves, in that
it makes it the responsibility of the slave device's parent to enumerate
the device.

To support other types of slave devices which require the same special
handling but where the bus is not strictly a serial bus, such as devices on
the HiSilicon LPC controller bus, rename acpi_is_serial_bus_slave() to
acpi_device_enumeration_by_parent(), so that the name can fit the wider
purpose.

Also rename the associated device flag acpi_device_flags.serial_bus_slave
to .enumeration_by_parent.

Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/scan.c

@@ -1524,7 +1524,7 @@ static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
 	return -1;
 }
 
-static bool acpi_is_serial_bus_slave(struct acpi_device *device)
+static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
 {
 	struct list_head resource_list;
 	bool is_serial_bus_slave = false;
@@ -1560,7 +1560,8 @@ void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
 	acpi_bus_get_flags(device);
 	device->flags.match_driver = false;
 	device->flags.initialized = true;
-	device->flags.serial_bus_slave = acpi_is_serial_bus_slave(device);
+	device->flags.enumeration_by_parent =
+		acpi_device_enumeration_by_parent(device);
 	acpi_device_clear_enumerated(device);
 	device_initialize(&device->dev);
 	dev_set_uevent_suppress(&device->dev, true);
@@ -1858,10 +1859,10 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
 static void acpi_default_enumeration(struct acpi_device *device)
 {
 	/*
-	 * Do not enumerate SPI/I2C/UART slaves as they will be enumerated by
-	 * their respective parents.
+	 * Do not enumerate devices with enumeration_by_parent flag set as
+	 * they will be enumerated by their respective parents.
 	 */
-	if (!device->flags.serial_bus_slave) {
+	if (!device->flags.enumeration_by_parent) {
 		acpi_create_platform_device(device, NULL);
 		acpi_device_set_enumerated(device);
 	} else {
@@ -1958,7 +1959,7 @@ static void acpi_bus_attach(struct acpi_device *device)
 		return;
 
 	device->flags.match_driver = true;
-	if (ret > 0 && !device->flags.serial_bus_slave) {
+	if (ret > 0 && !device->flags.enumeration_by_parent) {
 		acpi_device_set_enumerated(device);
 		goto ok;
 	}
@@ -1967,10 +1968,10 @@ static void acpi_bus_attach(struct acpi_device *device)
 	if (ret < 0)
 		return;
 
-	if (!device->pnp.type.platform_id && !device->flags.serial_bus_slave)
-		acpi_device_set_enumerated(device);
-	else
+	if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
 		acpi_default_enumeration(device);
+	else
+		acpi_device_set_enumerated(device);
 
  ok:
 	list_for_each_entry(child, &device->children, node)

include/acpi/acpi_bus.h

@@ -215,7 +215,7 @@ struct acpi_device_flags {
 	u32 of_compatible_ok:1;
 	u32 coherent_dma:1;
 	u32 cca_seen:1;
-	u32 serial_bus_slave:1;
+	u32 enumeration_by_parent:1;
 	u32 reserved:19;
 };