On Tue, May 30, 2017 at 10:01 AM, Jan Kiszka [off-list ref] wrote:

On the SIMATIC, IOT2040 only a single pin is exportable as GPIO, the
rest is required to operate the UART. To allow modeling this case,
expand the platform device data structure to specify a (consecutive) pin
subset for exporting by the gpio-exar driver.

 static void *
-xr17v35x_register_gpio(struct pci_dev *pcidev)

+xr17v35x_register_gpio(struct pci_dev *pcidev, unsigned int first_pin,
+                      unsigned int ngpios)

I would rather to provide properties here as a parameter...

 {
+       struct property_entry properties[] = {
+               PROPERTY_ENTRY_U32("gpio-exar,first-pin", first_pin),
+               PROPERTY_ENTRY_U32("ngpios", ngpios),
+               { }
+       };

                if (pcidev->vendor == PCI_VENDOR_ID_EXAR)

...while defining them somewhere here.

                        port->port.private_data =
-                               xr17v35x_register_gpio(pcidev);
+                               xr17v35x_register_gpio(pcidev, 0, 16);

-- 
With Best Regards,
Andy Shevchenko