/sys/devices/.../CTLR/spiB.C ... spi_device for on bus "B",
chipselect C, accessed through CTLR.
+ /sys/devices/.../CTLR/spiB.C/modalias ... identifies the driver
+ that should be used with this device (for hotplug/coldplug)
+
/sys/bus/spi/devices/spiB.C ... symlink to the physical
spiB-C device
Like with other static board-specific setup, you won't unregister those.
+The widely used "card" style computers bundle memory, cpu, and little else
+onto a card that's maybe just thirty square centimeters. On such systems,
+your arch/.../mach-.../board-*.c file would primarily provide information
+about the devices on the mainboard into which such a card is plugged. That
+certainly includes SPI devices hooked up through the card connectors!
+
NON-STATIC CONFIGURATIONS
board info based on the board that was hotplugged. Of course, you'd later
call at least spi_unregister_device() when that board is removed.
+When Linux includes support for MMC/SD/SDIO/DataFlash cards through SPI, those
+configurations will also be dynamic. Fortunately, those devices all support
+basic device identification probes, so that support should hotplug normally.
+
How do I write an "SPI Protocol Driver"?
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