Linux Device Drivers Development

Special regmap_multi_reg_write function

The purpose of the regmap_multi_reg_write() function is writing multiple registers to the device. Its prototype looks as follows:

int regmap_multi_reg_write(struct regmap *map, 
                    const struct reg_sequence *regs, int num_regs) 

To see how to use that function, you need to know what struct reg_sequence is:

/** 
 * Register/value pairs for sequences of writes with an optional delay in 
 * microseconds to be applied after each write. 
 * 
 * @reg: Register address. 
 * @def: Register value. 
 * @delay_us: Delay to be applied after the register write in microseconds 
 */ 
struct reg_sequence { 
    unsigned int reg; 
    unsigned int def; 
    unsigned int delay_us; 
}; 

And this is how it is used:

static const struct reg_sequence foo_default_regs[] ...