regmap: implement register striding
authorStephen Warren <swarren@nvidia.com>
Mon, 9 Apr 2012 19:40:24 +0000 (13:40 -0600)
committerMark Brown <broonie@opensource.wolfsonmicro.com>
Tue, 10 Apr 2012 10:01:18 +0000 (11:01 +0100)
commitf01ee60fffa4dc6c77122121233a793f7f696e67
tree5072955487b9e4c80f5c6f6454358d80e8f23a48
parentc0cc6fe1d09e3f1baecbdf8922473c8e7d3a5317
regmap: implement register striding

regmap_config.reg_stride is introduced. All extant register addresses
are a multiple of this value. Users of serial-oriented regmap busses will
typically set this to 1. Users of the MMIO regmap bus will typically set
this based on the value size of their registers, in bytes, so 4 for a
32-bit register.

Throughout the regmap code, actual register addresses are used. Wherever
the register address is used to index some array of values, the address
is divided by the stride to determine the index, or vice-versa. Error-
checking is added to all entry-points for register address data to ensure
that register addresses actually satisfy the specified stride. The MMIO
bus ensures that the specified stride is large enough for the register
size.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
drivers/base/regmap/internal.h
drivers/base/regmap/regcache-lzo.c
drivers/base/regmap/regcache-rbtree.c
drivers/base/regmap/regcache.c
drivers/base/regmap/regmap-debugfs.c
drivers/base/regmap/regmap-irq.c
drivers/base/regmap/regmap-mmio.c
drivers/base/regmap/regmap.c
include/linux/regmap.h