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    • Mark Brown's avatar
      regmap: Add generic non-memory mapped register access API · b83a313b
      Mark Brown authored
      
      There are many places in the tree where we implement register access for
      devices on non-memory mapped buses, especially I2C and SPI. Since hardware
      designers seem to have settled on a relatively consistent set of register
      interfaces this can be effectively factored out into shared code.  There
      are a standard set of formats for marshalling data for exchange with the
      device, with the actual I/O mechanisms generally being simple byte
      streams.
      
      We create an abstraction for marshaling data into formats which can be
      sent on the control interfaces, and create a standard method for
      plugging in actual transport underneath that.
      
      This is mostly a refactoring and renaming of the bottom level of the
      existing code for sharing register I/O which we have in ASoC. A
      subsequent patch in this series converts ASoC to use this.  The main
      difference in interface is that reads return values by writing to a
      location provided by a pointer rather than in the return value, ensuring
      we can use the full range of the type for register data.  We also use
      unsigned types rather than ints for the same reason.
      
      As some of the devices can have very large register maps the existing
      ASoC code also contains infrastructure for managing register caches.
      This cache work will be moved over in a future stage to allow for
      separate review, the current patch only deals with the physical I/O.
      
      Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
      Acked-by: default avatarLiam Girdwood <lrg@ti.com>
      Acked-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      Acked-by: default avatarWolfram Sang <w.sang@pengutronix.de>
      Acked-by: default avatarGrant Likely <grant.likely@secretlab.ca>
      b83a313b
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