Attention is currently required from: Xiang Wang, Stefan Reinauer, Angel Pons.

Xiang Wang uploaded patch set #7 to this change.

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bitbang-spi.c: support clock polarity and phase

SPI has four modes, which are determined by Clock polarity and Clock phase.
See https://en.wikipedia.org/wiki/Serial_Peripheral_Interface#Clock_polarity_and_phase
for details. The previous code only supports one mode and may not be able to
handle some special spi flash.

TEST=build and run flashrom with sysfsgpio on raspberrypi to read W25Q128.V

Change-Id: I04c1dfe132d756119229b27c3cd611d1be1abc8d
Signed-off-by: Xiang Wang <merle@hardenedlinux.org>
---
M bitbang_spi.c
1 file changed, 71 insertions(+), 19 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/55/49255/7

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Gerrit-Project: flashrom
Gerrit-Branch: master
Gerrit-Change-Id: I04c1dfe132d756119229b27c3cd611d1be1abc8d
Gerrit-Change-Number: 49255
Gerrit-PatchSet: 7
Gerrit-Owner: Xiang Wang <merle@hardenedlinux.org>
Gerrit-Reviewer: Angel Pons <th3fanbus@gmail.com>
Gerrit-Reviewer: Edward O'Callaghan <quasisec@chromium.org>
Gerrit-Reviewer: Stefan Reinauer <stefan.reinauer@coreboot.org>
Gerrit-Reviewer: build bot (Jenkins) <no-reply@coreboot.org>
Gerrit-CC: Shawn C <citypw@hardenedlinux.org>
Gerrit-Attention: Xiang Wang <merle@hardenedlinux.org>
Gerrit-Attention: Stefan Reinauer <stefan.reinauer@coreboot.org>
Gerrit-Attention: Angel Pons <th3fanbus@gmail.com>
Gerrit-MessageType: newpatchset