Summary
This chapter is all about register access related Regmap APIs. Its simplicity should give you an idea of how useful and widely used it is. This chapter has shown everything you need to know about the Regmap API. Now you should be able to convert any standard SPI/I2C/memory-mapped driver into Regmap.
The next chapter will cover IRQ management under Linux, however, two chapters after, we will cover IIO devices, a framework for analog-to-digital converters. Those kinds of devices always sit on top of SPI/I2C buses. It could be a challenge for us, at the end of that chapter, to write an IIO driver using the Regmap API.
