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Revert "spi: mediatek: add set_cs_timing support"

Andy Hsieh requested to merge mediatek/aiot/team-mtk-aiot-sw-ss2/linux-20211109:andy/revert-spi-cs-timing-patch into mtk-v5.15-dev

This reverts commit

  • 9f6e7e8d spi: mediatek: add set_cs_timing support
  • 04e6bb0d spi: modify set_cs_timing parameter
  • 5c842e51 spi: mediatek: fix build warnning in set cs timing
  • 3672bb82 spi: mediatek: skip delays if they are 0

The default cs_timing calculation has been removed, and the cs_timing setting API has been removed as well.

Therefore, there's no way to set cs_timing now.

This causes SPI to lose data. So we temporarily revert this patch, and add it back when SPI driver owner has new update for cs_timing.

BUG: AIOT-1098

Edited by Andy Hsieh

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