linux-toradex.git/drivers/base/regmap/regmap.c, branch v3.2.74

regmap: Fix handling of volatile registers for format_write() chips

2014-11-05T20:27:39+00:00

commit 5844a8b9d98ec11ce1d77610daacf3f0a0e14715 upstream.

A previous over-zealous factorisation of code means that we only treat
registers as volatile if they are readable. For most devices this is fine
since normally most registers can be read and volatility implies
readability but for format_write() devices where there is no readback from
the hardware and we use volatility to mean simply uncacheability this means
that we end up treating all registers as cacheble.

A bigger refactoring of the code to clarify this is in order but as a fix
make a minimal change and only check readability when checking volatility
if there is no format_write() operation defined for the device.

Signed-off-by: Mark Brown 
Tested-by: Lars-Peter Clausen 
Signed-off-by: Ben Hutchings

regmap: if format_write is used, declare all registers as "unreadable"

2014-11-05T20:27:39+00:00

commit 4191f19792bf91267835eb090d970e9cd6277a65 upstream.

Using .format_write means, we have a custom function to write to the
chip, but not to read back. Also, mark registers as "not precious" and
"not volatile" which is implicit because we cannot read them. Make those
functions use 'regmap_readable' to reuse the checks done there.

Signed-off-by: Wolfram Sang 
Signed-off-by: Mark Brown 
Signed-off-by: Ben Hutchings

regmap: Support some block operations on cached devices

2011-10-13T10:41:54+00:00

Support raw reads if all the registers being read are volatile, the cache
will have no impact for tem.

Support bulk reads either directly (if all the registers are volatile) or
by falling back to iterating over single register reads otherwise.

Signed-off-by: Mark Brown

regmap: Warn on raw I/O as well as bulk reads that bypass cache

2011-10-10T09:24:33+00:00

As with the bulk reads we really should be able to make these play
nicely with the cache but warn for now.

Signed-off-by: Mark Brown 
Acked-by: Dimitris Papastamos

regmap: Make _regmap_write() global

2011-09-29T10:19:45+00:00

Signed-off-by: Dimitris Papastamos 
Signed-off-by: Mark Brown

regmap: Incorporate the regcache core into regmap

2011-09-19T18:06:35+00:00

This patch incorporates the regcache core code into regmap.  All previous
patches have been no-ops essentially up to this point.

The bulk read operation is not supported by regcache at the moment.  This
will be implemented incrementally.

Signed-off-by: Dimitris Papastamos 
Tested-by: Lars-Peter Clausen 
Signed-off-by: Mark Brown

regmap: Add support for device specific write and read flag masks.

2011-09-05T21:55:57+00:00

Some buses like SPI have no standard notation of read or write operations.
The general scheme here is to set or clear specific bits in the register
address to indicate whether the operation is a read or write. We already
support having a read flag mask per bus, but as there is no standard
the bits which need to be set or cleared differ between devices and vendors,
thus we need a mechanism to specify them per device.

This patch adds two new entries to the regmap_config struct, read_flag_mask and
write_flag_mask. These will be or'ed onto the top byte when doing a read or
write operation. If both masks are empty the device will fallback to the
regmap_bus masks.

Signed-off-by: Lars-Peter Clausen 
Signed-off-by: Mark Brown

Merge branch 'regmap-linus' into regmap-next

2011-09-05T17:56:57+00:00

regmap: Remove bitrotted module_put()s

2011-09-05T17:55:58+00:00

The conversion to per bus type registration functions means we don't need
to do module_get()s to hold the bus types in memory (their users will link
to them) so we removed all those calls. This left module_put() calls in
the cleanup paths which aren't needed and which cause unbalanced puts if
we ever try to unload anything.

Reported-by: Jonathan Cameron 
Signed-off-by: Mark Brown

regmap: Add functions to check for access on registers

2011-08-14T10:51:11+00:00

We're going to be using these in quite a few places so factor out the
readable/writable/volatile/precious checks.

Signed-off-by: Mark Brown