mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-29 05:44:11 +00:00
Code Issues Releases Wiki Activity

ACPI / scan: Create platform device for fwnodes with multiple i2c devices

Browse source 
Some devices have multiple I2cSerialBus resources and for things to work
an i2c-client must be instantiated for each, each with its own
i2c_device_id.

Normally we only instantiate an i2c-client for the first resource, using
the ACPI HID as id.

This commit adds a list of HIDs of devices, which need multiple i2c-clients
instantiated from a single fwnode, to acpi_device_enumeration_by_parent and
makes acpi_device_enumeration_by_parent return false for these devices so
that a platform device will be instantiated.

This allows the drivers/platform/x86/i2c-multi-instantiate.c driver, which
knows which i2c_device_id to use for each resource, to bind to the fwnode
and initiate an i2c-client for each resource.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Hans de Goede 2018-08-09 11:15:56 +02:00 committed by Rafael J. Wysocki
parent 5971b0c159
commit aba941392a
1 changed files with 16 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

16
drivers/acpi/scan.c
View file

@ -1540,6 +1540,18 @@ static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
{
struct list_head resource_list;
bool is_serial_bus_slave = false;
/*
* These devices have multiple I2cSerialBus resources and an i2c-client
* must be instantiated for each, each with its own i2c_device_id.
* Normally we only instantiate an i2c-client for the first resource,
* using the ACPI HID as id. These special cases are handled by the
* drivers/platform/x86/i2c-multi-instantiate.c driver, which knows
* which i2c_device_id to use for each resource.
*/
static const struct acpi_device_id i2c_multi_instantiate_ids[] = {
{"BSG1160", },
{}
};
if (acpi_is_indirect_io_slave(device))
return true;
@ -1551,6 +1563,10 @@ static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
fwnode_property_present(&device->fwnode, "baud")))
return true;
/* Instantiate a pdev for the i2c-multi-instantiate drv to bind to */
if (!acpi_match_device_ids(device, i2c_multi_instantiate_ids))
return false;
INIT_LIST_HEAD(&resource_list);
acpi_dev_get_resources(device, &resource_list,
acpi_check_serial_bus_slave,