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Subject[PATCH v4 4/5] 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.

Cc: Federico Lorenzi <florenzi@gmail.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reported-and-tested-by: Ronald Tschalär <ronald@innovation.ch>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
---
drivers/acpi/scan.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 943536c9a2a8..71a067c412a1 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);
--
2.11.0
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