Hi Johan, I've been developing some iio device drivers and found that some people would like to test their devices with a qemu system which requires an i2c or spi port on our development hosts. Usually this is achieved with a DLN-2 adapter, while this is a bit difficult for me because it costs ~175$ in my country. Then I found that FTDI's FT232H supports both these two modes and costs only less than 5$ but without full support in kernel. The ftdi-sio driver supports FT232H only as a serial converter. So I'm planning to write a mfd driver for it supports both these three modes, here are my thoughts: - This device cannot support these three modes together because they share some common pins, so I'm planning to add a sysfs entry 'current_mode' for selecting which mode the device should be working on. - This device is in uart mode on reset, so default mode would be reset, too. This also helps for people only want to use this as a serial converter feels nothing has happened (compatible). - I was trying to reuse the ftdi-sio driver but it seems like mfd can only register platform devices, while this is a usb driver. I may have to copy some functions from this driver. Would you share any ideas? I'd appreciate it. yours, Song Qiang
