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| author | Lukas Wunner <lukas@wunner.de> | 2017-08-01 14:10:41 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-08-03 23:26:22 +0200 |
| commit | ca9ef3ab68d3530ac93d4254f9e47724ea51758d (patch) | |
| tree | ba03933cd6a052c836c7cd26f0f2dfd0693a9ac1 /drivers/acpi | |
| parent | 899596e090ea21918c55cbccea594be840af44ea (diff) | |
| download | linux-ca9ef3ab68d3530ac93d4254f9e47724ea51758d.tar.gz linux-ca9ef3ab68d3530ac93d4254f9e47724ea51758d.tar.bz2 linux-ca9ef3ab68d3530ac93d4254f9e47724ea51758d.zip | |
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>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/scan.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 33897298f03e..55fd248833cd 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -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); |