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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: Ronald Tschalär <ronald@innovation.ch>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
hifive-unleashed-5.1
Lukas Wunner 2017-08-01 14:10:41 +02:00 committed by Rafael J. Wysocki
parent 899596e090
commit ca9ef3ab68
1 changed files with 7 additions and 0 deletions
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7
drivers/acpi/scan.c
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@ -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);