Hi Takashi
you are right it is rising edge and clock polarity can be changed using CSI0_SENS_PIX_CLK_POL
bit register IPU_CSI0_SENS_CONF, described in 38.5.151 CSI0 Sensor Configuration
Register (IPU_CSI0_SENS_CONF) i.MX6SDL Reference Manual
http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6SDLRM.pdf
Best regards
igor
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