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| author | Guenter Roeck <linux@roeck-us.net> | 2015-02-03 18:01:19 (GMT) |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2015-02-04 20:48:13 (GMT) |
| commit | 5892ded23c8e9e015b01347222ba4de8a80e7ce2 (patch) | |
| tree | 24a8457b9c79c08289add18d09c07ed6cb22c9ae /arch/powerpc/boot | |
| parent | 3c174d29263b1954171cf857a9bf59dcbe527875 (diff) | |
| download | linux-5892ded23c8e9e015b01347222ba4de8a80e7ce2.tar.xz | |
regmap: Fix i2c word access when using SMBus access functions
SMBus access functions assume that 16-bit values are formatted as
little endian numbers. The direct i2c access functions in regmap,
however, assume that 16-bit values are formatted as big endian numbers.
As a result, the current code returns different values if an i2c chip's
16-bit registers are accessed through i2c access functions vs. SMBus
access functions.
Use regmap_smbus_read_word_swapped and regmap_smbus_write_word_swapped
for 16-bit SMBus accesses if a chip is configured as REGMAP_ENDIAN_BIG.
If the chip is configured as REGMAP_ENDIAN_LITTLE, keep using
regmap_smbus_write_word_data and regmap_smbus_read_word_data. Otherwise
reject registration if the controller does not support direct i2c accesses.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'arch/powerpc/boot')
0 files changed, 0 insertions, 0 deletions