Unverified Commit e612af7a authored by Stefan Binding's avatar Stefan Binding Committed by Mark Brown
Browse files

spi: Add API to count spi acpi resources 



Some ACPI nodes may have more than one Spi Resource.
To be able to handle these case, its necessary to have
a way of counting these resources.

Signed-off-by: default avatarStefan Binding <sbinding@opensource.cirrus.com>
Reviewed-by: default avatarHans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20220121172431.6876-5-sbinding@opensource.cirrus.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 87e59b36

drivers/spi/spi.c

+40 −0
Original line number Diff line number Diff line
@@ -2324,6 +2324,46 @@ struct acpi_spi_lookup { 
	int			index;

};



static int acpi_spi_count(struct acpi_resource *ares, void *data)

{

	struct acpi_resource_spi_serialbus *sb;

	int *count = data;



	if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)

		return 1;



	sb = &ares->data.spi_serial_bus;

	if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_SPI)

		return 1;



	*count = *count + 1;



	return 1;

}



/**

 * acpi_spi_count_resources - Count the number of SpiSerialBus resources

 * @adev:	ACPI device

 *

 * Returns the number of SpiSerialBus resources in the ACPI-device's

 * resource-list; or a negative error code.

 */

int acpi_spi_count_resources(struct acpi_device *adev)

{

	LIST_HEAD(r);

	int count = 0;

	int ret;



	ret = acpi_dev_get_resources(adev, &r, acpi_spi_count, &count);

	if (ret < 0)

		return ret;



	acpi_dev_free_resource_list(&r);



	return count;

}

EXPORT_SYMBOL_GPL(acpi_spi_count_resources);



static void acpi_spi_parse_apple_properties(struct acpi_device *dev,

					    struct acpi_spi_lookup *lookup)

{

include/linux/spi/spi.h

+1 −0
Original line number Diff line number Diff line
@@ -764,6 +764,7 @@ extern void spi_unregister_controller(struct spi_controller *ctlr); 
extern struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr,

						struct acpi_device *adev,

						int index);

int acpi_spi_count_resources(struct acpi_device *adev);

#endif



/*