Solved
Which SPI mode (CPOL, CPHA values) should one use with IIS3DWB and IIS2DH sensors?
SPI_MODE0 (0, 0)
SPI_MODE1 (0, 1)
SPI_MODE2 (1, 0)
SPI_MODE3 (1, 1)
SPI_MODE0 (0, 0)
SPI_MODE1 (0, 1)
SPI_MODE2 (1, 0)
SPI_MODE3 (1, 1)
From the first datasheet:

The second device seems to want mode 3 only, or at least doesn't specify.
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