[PATCH v1 0/3] spi: Add more consistency to CS handle

[Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>]

There are the following issues with the current code:
- inconsistent use of 0xFF and -1 for invalid chip select pin
- inconsistent plain or BIT() use with a hard-to-understand comment
- wrong types used for last_cs_* fields

Fix all of these here.

Andy Shevchenko (3):
  spi: Consistently use BIT for cs_index_mask
  spi: Fix types of the last chip select storage variables
  spi: Introduce SPI_INVALID_CS and is_valid_cs()

 drivers/spi/spi.c       | 74 +++++++++++++++++++----------------------
 include/linux/spi/spi.h | 12 +++----
 2 files changed, 40 insertions(+), 46 deletions(-)

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2.43.0.rc1.1.gbec44491f096