Summary

This chapter was all about the regmap API. How easy it is gives you an idea of how useful and widely used it is. This chapter told you everything you need to know about the regmap API. Now, you should be able to convert any standard SPI/I2C driver into a regmap. The next chapter will cover IIO devices, a framework for an analog-to-digital converter. Those kinds of device always sit on top of the SPI/I2C buses. It will be a challenge for us, at the end of the next chapter, to write an IIO driver using the regmap API.