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spi: add Kconfig variable for dual-output read enable

Hardware / Coreboot - David Hendricks [chromium.org] - 17 September 2014 12:56 UTC

Add a Kconfig variable so that driver code knows whether or not to use dual-output reads.

1101a71 spi: add Kconfig variable for dual-output read enable
src/drivers/spi/Kconfig | 9 +++++++
src/mainboard/google/nyan/Kconfig | 2 ++
src/soc/nvidia/tegra124/spi.c | 53 ++++++++++++++++++++++++++++---------
src/soc/nvidia/tegra124/spi.h | 1 +
4 files changed, 53 insertions(+), 12 deletions(-)

Upstream: review.coreboot.org