spi: Add TODO comment about ACPI GPIO setup

Add a TODO comment that ideally the ACPI/gpiolib core code should take care
of setting GPIO direction and/or bias according to ACPI GPIO resources.

If this TODO gets implemented then the acpi_dev_gpio_irq_get() call in
acpi_register_spi_device() can be dropped.

Suggested-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <johannes.goede@oss.qualcomm.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Link: https://patch.msgid.link/20251109155340.26199-1-johannes.goede@oss.qualcomm.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Hans de Goede

drivers/spi/spi.c

@@ -2857,6 +2857,8 @@ static acpi_status acpi_register_spi_device(struct spi_controller *ctlr,
 	 * here too, because this call sets the GPIO direction and/or bias.
 	 * Setting these needs to be done even if there is no driver, in which
 	 * case spi_probe() will never get called.
+	 * TODO: ideally the setup of the GPIO should be handled in a generic
+	 * manner in the ACPI/gpiolib core code.
 	 */
 	if (spi->irq < 0)
 		spi->irq = acpi_dev_gpio_irq_get(adev, 0);