Linux Device Drivers Development

Define and register SPI driver

Again the principle is the same as that for I2C drivers. We need to define a struct of_device_id to match devices in the DT, and call the MODULE_DEVICE_TABLE macro to register with the OF core:

static const struct of_device_id foobar_of_match[] = { 
           { .compatible = "packtpub,foobar-device" }, 
           { .compatible = "packtpub,barfoo-device" }, 
        {} 
}; 
MODULE_DEVICE_TABLE(of, foobar_of_match); 

Then, we define our spi_driver as the following:

static struct spi_driver foo_driver = { 
    .driver = { 
    .name   = "foo", 
        /* The following line adds Device tree */ 
    .of_match_table = of_match_ptr(foobar_of_match), 
    }, 
    .probe   = my_spi_probe, 
    .id_table = foo_id, 
}; 

You can then improve the probe function this way:

static int my_spi_probe(struct ...