On Thu, May 24, 2018 at 07:04:11PM +0300, Radu Pirea wrote:

>     if (ctlr->cs_gpios){
>         spi->cs_gpio = ctlr->cs_gpios[spi->chip_select];
>         if(gpio_is_valid(spi->cs_gpio))
>             gpio_direction_output(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH));
> 
>     }

You're expected to request the GPIOs in your driver using one of the
modern request functions like gpio_request_one() (or ideally the GPIO
descriptor APIs now) which combine the direction setting and request
into a single operation.