Summary

This chapter essentially dealt with regmap core. We introduced the framework, walked through its APIs, and described some use cases. Apart from register access, we have also learned how to use regmap for MMIO-based IRQ management. The next chapter, which deals with MFD devices and the syscon framework, will make intense use of the concepts learned in this chapter. By the end of this chapter, you should be able to develop regmap-enabled IRQ controllers, and you won’t find yourself reinventing the wheel and leveraging this framework for register access.