On Thu, Dec 12, 2019 at 04:14:59PM +0100, Andreas Färber wrote:

Am 12.12.19 um 09:40 schrieb Geert Uytterhoeven:

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On Thu, Dec 12, 2019 at 4:41 AM Andreas Färber [off-list ref] wrote:

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Add support for slave DT property spi-lsb-first, i.e., SPI_LSB_FIRST mode.

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Duplicate the inline helpers bitbang_txrx_be_cpha{0,1} as LE versions.
Make checkpatch.pl happy by changing "unsigned" to "unsigned int".

Separate patch for this?

So from that angle I don't see a better way than either duplicating the
functions or using some macro magic to #include the header twice. If we
wanted to go down that path, we could probably de-duplicate the existing
two functions, too, but I was trying to err on the cautious side, since
I don't have setups to test all four code paths myself (and a ton of
more relevant but less fun patches to flush out ;)).

Yeah, I don't think there's any great options here with the potential
performance issues - probably the nicest thing would be to autogenerate
lots of variants but I think that's far more trouble than it's worth.