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    SubjectRe: [PATCH 1/4] regmap: Add generic non-memory mapped register access API
    On Sat, Jul 09, 2011 at 01:50:41PM +0900, Mark Brown wrote:
    > 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.
    > We also only deal with access to a single register at a time initially
    > as this is the most common case.
    >
    > Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
    > Acked-by: Liam Girdwood <lrg@ti.com>

    Acked-by: Greg Kroah-Hartman <gregkh@suse.de>


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