spi: acpi: Initialize modalias from of_compatible

When using devicetree spi_device.modalias is set to the compatible
string with the vendor prefix removed. For SPI devices described via
ACPI the spi_device.modalias string is initialized by acpi_device_hid.
When using ACPI and DT ids this string ends up something like "PRP0001".

Change acpi_register_spi_device to use the of_compatible property if
present. This makes it easier to instantiate spi drivers through ACPI
with DT ids.

Signed-off-by: Dan O'Donovan <dan@emutex.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 656dd3e3220c..ad7f638a0a5b 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1722,13 +1722,15 @@ static acpi_status acpi_register_spi_device(struct spi_master *master,
                 return AE_OK;
         }
 
+        acpi_set_modalias(adev, acpi_device_hid(adev), spi->modalias,
+                          sizeof(spi->modalias));
+
         if (spi->irq < 0)
                 spi->irq = acpi_dev_gpio_irq_get(adev, 0);
 
         acpi_device_set_enumerated(adev);
 
         adev->power.flags.ignore_parent = true;
-        strlcpy(spi->modalias, acpi_device_hid(adev), sizeof(spi->modalias));
         if (spi_add_device(spi)) {
                 adev->power.flags.ignore_parent = false;
                 dev_err(&master->dev, "failed to add SPI device %s from ACPI\n",