linux-toradex.git/drivers/base/regmap, branch v3.3.5

regmap: prevent division by zero in rbtree_show

2012-04-13T16:13:55+00:00

commit c04c1b9ee8f30c7a3a25e20e406247003f634ebe upstream.

If there are no nodes in the cache, nodes will be 0, so calculating
"registers / nodes" will cause division by zero.

Signed-off-by: Stephen Warren 
Signed-off-by: Mark Brown 
Signed-off-by: Greg Kroah-Hartman

regmap: Fix cache defaults initialization from raw cache defaults

2012-02-15T16:31:32+00:00

Currently registers with a value of 0 are ignored when initializing the register
defaults from raw defaults. This worked in the past, because registers without a
explicit default were assumed to have a default value of 0. This was changed in
commit b03622a8 ("regmap: Ensure rbtree syncs registers set to zero properly").
As a result registers, which have a raw default value of 0 are now assumed to
have no default. This again can result in unnecessary writes when syncing the
cache. It will also result in unnecessary reads for e.g. the first update
operation. In the case where readback is not possible this will even let the
update operation fail, if the register has not been written to before.

So this patch removes the check. Instead it adds a check to ignore raw defaults
for registers which are volatile, since those registers are not cached.

Signed-off-by: Lars-Peter Clausen 
Signed-off-by: Mark Brown 
Cc: stable@vger.kernel.org

regmap: Reset cache status when reinitialsing the cache

2012-01-20T13:49:30+00:00

When we reinitialise the cache make sure that we reset the cache access
flags, ensuring that the reinitialised cache is in the default state
which is what callers would and do expect given the function name.

This is particularly likely to cause issues in systems where there was no
cache previously as those systems have cache bypass enabled, as for the
wm8994 driver where this was noticed.

Signed-off-by: Mark Brown

Merge branch 'regmap/irq' into regmap-next

2011-12-05T16:21:05+00:00

regmap: Add irq_base accessor to regmap_irq

2011-12-05T16:13:31+00:00

Allows devices to discover their own interrupt without having to remember
it themselves.

Signed-off-by: Mark Brown

Merge branch 'topic/cache' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap into regmap-next

2011-12-05T13:18:50+00:00

regmap: Allow drivers to reinitialise the register cache at runtime

2011-12-05T13:17:36+00:00

Sometimes the register map information may change in ways that drivers can
discover at runtime. For example, new revisions of a device may add new
registers. Support runtime discovery by drivers by allowing the register
cache to be reinitialised with a new function regmap_reinit_cache() which
discards the existing cache and creates a new one.

Signed-off-by: Mark Brown

regmap: Add trace event for successful cache reads

2011-11-30T20:51:09+00:00

Currently we only trace physical reads, there's no instrumentation if
the read is satisfied from cache.

Signed-off-by: Mark Brown

regmap: Allow regmap_update_bits() users to detect changes

2011-11-29T20:15:50+00:00

Some users of regmap_update_bits() would like to be able to tell their
users if they actually did an update so provide a variant which also
returns a flag indicating if an update took place. We could return a
tristate in the return value of regmap_update_bits() but this makes the
API more cumbersome to use and doesn't fit with the general zero for
success idiom we have.

Signed-off-by: Mark Brown

Merge remote-tracking branch 'regmap/topic/irq' into regmap-next

2011-11-28T18:52:24+00:00