On Mon, Jun 29, 2015 at 09:27:17AM +0200, Christian Hartmann wrote:

> FYI: I can confirm that with the changed DSDT.dsl file and loading
> the new custom DSDT table, I do not need this patch mentioned above.

Are you sure?

> [    5.927801] spi-WM510205:00 supply DCVDD not found, using dummy regulator
> [    5.928958] arizona spi-WM510205:00: Unknown device ID: ffff
> [    5.929098] pxa2xx-spi 80860F0E:00: registered child spi-WM510205:00

The above is saying that SPI I/O to the device isn't working - the
device ID is not being read back successfully.