Hi All! I'm working on the 9tripod X3399 SoM, based on the Rockchip RK3399 SoC. I am using a Sony IMX 258 image sensor which is attached to the second I2C bus and using the CIF clock out of GPIO2-B3. The IMX258 driver has been updated to reference this clock via the device tree at 24MHz. The issue I'm seeing is that the driver is trying to access to the image sensor via the I2C bus before the clock is enabled, yet we set the pinmux by default in the device tree. I can see this using a logic analyzer that the clock is enabled very long after the device has been probed and the driver starts to use the bus. It seems like there is some parent to the CIF clock that is controlling it, but there's nothing in the RK3399 TRM that shows this. If I compile the IMX258 driver as a module and insmod after boot we are able to communicate with the camera. Does this make sense? Shouldn't the clock be enabled as soon as the pinmux has been set? Or is there perhaps something with the clock configuration? Cheers! _______________________________________________ Linux-rockchip mailing list Linux-rockchip@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/linux-rockchip
