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Commit ca9ef3ab authored by Lukas Wunner's avatar Lukas Wunner Committed by Rafael J. Wysocki
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ACPI / scan: Recognize Apple SPI and I2C slaves 



SPI and I2C slaves are enumerated by their respective parents rather
than the ACPI core.  They are recognized by presence of _CRS resources,
which however are missing on Macs.  Check for presence of device
properties instead.

Reported-and-tested-by: default avatarRonald Tschalär <ronald@innovation.ch>
Signed-off-by: default avatarLukas Wunner <lukas@wunner.de>
Acked-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 899596e0

drivers/acpi/scan.c

+7 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 
#include <linux/dmi.h>

#include <linux/nls.h>

#include <linux/dma-mapping.h>

#include <linux/platform_data/x86/apple.h>



#include <asm/pgtable.h>
@@ -1452,6 +1453,12 @@ static bool acpi_is_spi_i2c_slave(struct acpi_device *device) 
	struct list_head resource_list;

	bool is_spi_i2c_slave = false;



	/* Macs use device properties in lieu of _CRS resources */

	if (x86_apple_machine &&

	    (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||

	     fwnode_property_present(&device->fwnode, "i2cAddress")))

		return true;



	INIT_LIST_HEAD(&resource_list);

	acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,

			       &is_spi_i2c_slave);