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staging: wfx: add support for I/O access

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Introduce bus level communication layer. At this level, 7 registers can
be addressed.

Notice that SPI driver is able to manage chip reset. SDIO mode relies
on an external driver (`mmc-pwrseq`) to reset chip.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20190919142527.31797-3-Jerome.Pouiller@silabs.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jérôme Pouiller 2019-09-19 14:25:37 +00:00 • committed by Greg Kroah-Hartman
commit 0096214a59
7 changed files with 561 additions and 2 deletions
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