i2c / ACPI: add ACPI enumeration support
ACPI 5 introduced I2cSerialBus resource that makes it possible to enumerate
and configure the I2C slave devices behind the I2C controller. This patch
adds helper functions to support I2C slave enumeration.
An ACPI enabled I2C controller driver only needs to call acpi_i2c_register_devices()
in order to get its slave devices enumerated, created and bound to the
corresponding ACPI handle.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 800de22..d0c4db7 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -259,6 +259,7 @@
* @platform_data: stored in i2c_client.dev.platform_data
* @archdata: copied into i2c_client.dev.archdata
* @of_node: pointer to OpenFirmware device node
+ * @acpi_node: ACPI device node
* @irq: stored in i2c_client.irq
*
* I2C doesn't actually support hardware probing, although controllers and
@@ -279,6 +280,7 @@
void *platform_data;
struct dev_archdata *archdata;
struct device_node *of_node;
+ struct acpi_dev_node acpi_node;
int irq;
};
@@ -501,4 +503,11 @@
i2c_del_driver)
#endif /* I2C */
+
+#if IS_ENABLED(CONFIG_ACPI_I2C)
+extern void acpi_i2c_register_devices(struct i2c_adapter *adap);
+#else
+static inline void acpi_i2c_register_devices(struct i2c_adapter *adap) {}
+#endif
+
#endif /* _LINUX_I2C_H */