On Sat, Jul 02, 2016 at 04:55:49PM -0700, frowand.list@xxxxxxxxx wrote: > This is an extremely simple example to illustrate the concepts. It is not > meant to represent the complexity of a real board. > > To start with, assume that the device that will eventually be on a daughter > board is first soldered onto the mother board. The mother board contains > two devices connected via bus spi_1. One device is described in the .dts > file, the other is described in an included .dtsi file. > Then the device tree files will look like: Can I suggest not using SPI as an example here? It's particularly messy since addresses are essentially just a random signal that can be totally separate to the controller hardware which might be adding more complexity early on in building up your model than is really desirable. It will need to be dealt with but perhaps not right now. I2C might be easier. The initial issue with SPI is that you really need to do something like bring out individual slots on the bus rather than the bus as a whole since you're going to need a remapping layer to map chip selects on the module to chip selects on the host board.
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