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w1: ds1wm: make endian clean and use standard io memory accessors

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o Make endian clean, make HW-endianness configurable.

o Use ioread*, iowrite* instead of __raw_readb,__raw_writeb
  to also use memory-barriers when accessing HW-registers.
  We do not want reordering to happen here.

Both changes are tightly coupled, so I do them in one patch

Signed-off-by: Johannes Poehlmann <johannes.poehlmann@izt-labs.de>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johannes Poehlmann
2017-07-25 13:27:12 +02:00
committed by Greg Kroah-Hartman
parent 242b476f82
commit baa8055de0
2 changed files with 63 additions and 2 deletions
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5
include/linux/mfd/ds1wm.h
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@@ -16,6 +16,11 @@ struct ds1wm_driver_data {
*/
unsigned int reset_recover_delay;
/* Say 1 here for big endian Hardware
* (only relevant with bus-shift > 0
*/
bool is_hw_big_endian;
/* left shift of register number to get register address offsett.
* Only 0,1,2 allowed for 8,16 or 32 bit bus width respectively
*/