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Subject[PATCH v4 3/3] spi: acpi: Initialize modalias from of_compatible
Date
From: Crestez Dan Leonard <leonard.crestez@intel.com>

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: Crestez Dan Leonard <leonard.crestez@intel.com>
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>
---
drivers/spi/spi.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 656dd3e..9a8c880 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1722,13 +1722,20 @@ static acpi_status acpi_register_spi_device(struct spi_master *master,
return AE_OK;
}

+ /*
+ * Populate modalias from compatible property if available,
+ * otherwise use native ACPI information
+ */
+ if (acpi_of_modalias(adev, spi->modalias, sizeof(spi->modalias)))
+ strlcpy(spi->modalias, acpi_device_hid(adev),
+ 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",
--
2.7.4
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