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spi: add Kconfig variable for dual-output read enable

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

BUG=none
BRANCH=none
TEST=built and booted on Nyan
Signed-off-by: David Hendricks <dhendrix@chromium.org>

Change-Id: I31d23bfedd91521d719378ec573e33b381ebd2c5
Reviewed-on: https://chromium-review.googlesource.com/177834
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Commit-Queue: David Hendricks <dhendrix@chromium.org>
Tested-by: David Hendricks <dhendrix@chromium.org>
This commit is contained in:
David Hendricks 2013-11-22 18:41:38 -08:00 • committed by chrome-internal-fetch
commit de6869a335
1 changed files with 9 additions and 0 deletions
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9
src/drivers/spi/Kconfig
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@ -94,3 +94,12 @@ config SPI_FLASH_GIGADEVICE
help
Select this option if your chipset driver needs to store certain
data in the SPI flash and your SPI flash is made by Gigadevice.
config SPI_FLASH_FAST_READ_DUAL_OUTPUT_3B
bool
default n
depends on SPI_FLASH
help
Select this option if your SPI flash supports the fast read dual-
output command (opcode 0x3b) where the opcode and address are sent
to the chip on MOSI and data is received on both MOSI and MISO.