Commits on Dec 6, 2023

1. Non-memory addressable regmap generator …

   Moves the existing codegen into a mmio and makes it the default.
   The existing mmio generator is for mappable register maps where a
   simple pointer with offsets and infallible access is expected.
   
   Adds a new iface based generator for non-memory mappable register maps
   where access is expected to be fallible and require a simple read/write
   interface.
   
   The read/write register interface then provides all of the same kinds of
   functions that a typical regmap block generated by chiptool would have,
   with all functions being fallible.
   
   This enables generating regmaps from yaml files for peripheral chips on
   buses such as i2c or spi. No builtin notion of *how* th register map is
   accessible other than a simple read function given a register address
   and write function given an address and value are implementable by a
   driver.
   
   A driver using this for the WM8960 codec which requires some peculiar
   attributes was used to ensure the generated code was usable.
   
   This device in particular has some interesting quirks. The address size
   is 7 bits, the value size is 9 bits, and no reads are available over i2c
   for the device. Everything works as expected and the value/address
   container sizes are u8 and u16 as might be expected.
   
   Initial code was derived from the i2c branch Dario Nieuwenhuis had
   created for chiptool likely for the same goal.
   
   Co-authored-by: Dario Nieuwenhuis <[email protected]>

   

   SpinFast and Dirbaio committed Dec 6, 2023
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