summaryrefslogtreecommitdiffstats
path: root/arch/arm/nwfpe
diff options
context:
space:
mode:
authorQipan Li <Qipan.Li@csr.com>2014-03-01 05:38:17 +0100
committerMark Brown <broonie@linaro.org>2014-03-03 04:22:20 +0100
commiteeb7139524d1851c29b5c02b3dcd6679299a104e (patch)
tree330b91bd194e8024559ad597b0a1c905f53168db /arch/arm/nwfpe
parentspi: sirf: Use SIMPLE_DEV_PM_OPS macro (diff)
downloadlinux-eeb7139524d1851c29b5c02b3dcd6679299a104e.tar.xz
linux-eeb7139524d1851c29b5c02b3dcd6679299a104e.zip
spi: sirf: provide a shortcut for spi command-data mode
there are many SPI clients which use the following protocal: step 1: send command bytes to clients(rx buffer is empty) step 2: send data bytes to clients or receive data bytes from clients. SiRFprimaII provides a shortcut for this kind of SPI transfer. when tx buf is less or equal than 4 bytes and rx buf is null in a transfer, we think it as 'command' data and use hardware command register for the transfer. here we can save some CPU loading than doing both tx and rx for a normal transfer. Signed-off-by: Qipan Li <Qipan.Li@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'arch/arm/nwfpe')
0 files changed, 0 insertions, 0 deletions