I am running mainline kernel 4.2.6 on hummingboard-gate (imx6solo).
Now I have one raspberryPI as SPI master and the hummingboard as slave.
I connected SS/SCLK/MISO/MOSI, the waveform looks correct, however I never see data ready bit set in imx6's spi status register, or irq triggered.
all four pins are setup in IOMUXC as in pinmux tool.
CCM's ecspi2 clk is enabled, irq requested is 64
spi master is configured as CS active low, mode 0.
do I need to setup anything else?