On Wed, Jul 13, 2016 at 02:53:42PM +0300, Crestez Dan Leonard wrote:
> When using devicetree spi_device.modalias is set to the compatible
> string with the vendor prefix removed. For SPI devices described via
> ACPI the i2c_board_info.type string is initialized by acpi_device_hid.
> When using ACPI and DT ids this string ends up something like "PRP0001".
Please submit patches using subject lines reflecting the style for the
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patches. Look at what existing commits in the area you're changing are
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doing.
> 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.
This is basically fine but...
> + if (adev->data.of_compatible) {
> + ret = acpi_of_modalias(adev, spi->modalias, sizeof(spi->modalias));
> + if (ret) {
> + spi_dev_put(spi);
> + return AE_NOT_FOUND;
> + }
The only reason this could fail currently is that there wasn't a
compatible in the first place so why don't we just handle it like the no
compatible case? It's probably not realistic but it seems like there's
a small chance this could regress some platform if we do add more error
detection in acpi_of_modalias().
I'm still not sure why if we want to translate ACPI into DT why we don't
actually translate and avoid all this special casing and churn.
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