delay after SPIS uninit

Hi,

Due to shortage of pins SPI CS is reconfigured as GPIO while SPI is not used. Soft device is not used.

Problem is the delay that is needed after nrfx_spis_uninit call. 

Is it possible to check some register to know if uninit is already finished to avoid delay function? 1ms is a quite long period of time to be in delay (it looks that 500us in not enough).

static void spis_generate_irq (void){
  
  nrfx_spis_uninit(&spis);

  nrfx_coredep_delay_us(1000); // magic delay is necesary

  nrf_gpio_cfg( APP_SPIS_CS_PIN,
                NRF_GPIO_PIN_DIR_OUTPUT,
                NRF_GPIO_PIN_INPUT_DISCONNECT,
                NRF_GPIO_PIN_PULLUP,
                NRF_GPIO_PIN_H0D1,
                NRF_GPIO_PIN_NOSENSE);

  nrf_gpio_pin_write(APP_SPIS_CS_PIN, 0);
  nrfx_coredep_delay_us(100);
  nrf_gpio_pin_write(APP_SPIS_CS_PIN, 1);
  nrfx_coredep_delay_us(100);
}