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| author | Hans de Goede <hdegoede@redhat.com> | 2018-08-09 14:40:46 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2018-08-09 14:58:21 +0300 |
| commit | e64e84987de5486839afaccd191df71012ac1800 (patch) | |
| tree | 9b7084df64757285e1d5c2ad6fb7180a4513ab74 /drivers/platform/x86/Kconfig | |
| parent | 21ba074cb47171a34f60e250e8f7ef3dc1529e43 (diff) | |
| download | linux-e64e84987de5486839afaccd191df71012ac1800.tar.xz | |
platform/x86: Add ACPI i2c-multi-instantiate pseudo driver
On systems with ACPI instantiated i2c-clients, normally there is 1 fw_node
per i2c-device and that fw-node contains 1 I2cSerialBus resource for that 1
i2c-device.
But in some rare cases the manufacturer has decided to describe multiple
i2c-devices in a single ACPI fwnode with multiple I2cSerialBus resources.
An earlier attempt to fix this in the i2c-core resulted in a lot of extra
code to support this corner-case.
This commit introduces a new i2c-multi-instantiate driver which fixes this
in a different way. This new driver can be built as a module which will
only loaded on affected systems.
This driver will instantiate a new i2c-client per I2cSerialBus resource,
using the driver_data from the acpi_device_id it is binding to to tell it
which chip-type (and optional irq-resource) to use when instantiating.
Note this driver depends on a platform device being instantiated for the
ACPI fwnode, see the i2c_multi_instantiate_ids list of ACPI device-ids in
drivers/acpi/scan.c: acpi_device_enumeration_by_parent().
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/platform/x86/Kconfig')
| -rw-r--r-- | drivers/platform/x86/Kconfig | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index ac4d48830415..107d336453b2 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -1218,6 +1218,17 @@ config INTEL_CHTDC_TI_PWRBTN To compile this driver as a module, choose M here: the module will be called intel_chtdc_ti_pwrbtn. +config I2C_MULTI_INSTANTIATE + tristate "I2C multi instantiate pseudo device driver" + depends on I2C && ACPI + help + Some ACPI-based systems list multiple i2c-devices in a single ACPI + firmware-node. This driver will instantiate separate i2c-clients + for each device in the firmware-node. + + To compile this driver as a module, choose M here: the module + will be called i2c-multi-instantiate. + endif # X86_PLATFORM_DEVICES config PMC_ATOM |