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  1. Hi all, I've come upon a weird thing and I wanted to verify that I don't so something wrong. I've build a custom kernel module which is a PWM led device with an SPI interface. If I use the spidev, then everything works fine and I'm able to control the led. But when I'm using a custom device-tree and load the module then when I'm calling the `spi_write()` function then I'm getting an error (-22). The external device is actually an arduino nano that implements an I2C IIO light measurement device, using a dual light dependent resistor. Also I'm u