Lumentum OCM: setup the SPI bus
Too bad that we're going to use the J18 header as well. A possible
alternative could be something like a NOR gate at the CS1 and CS2 pins
which triggers when both of them are at logic zero. That *might* work.
That lovely kernel warning about "spidev" not being a shiny value in DT
is, well, just lovely. Yup, because patching kernel is definitely
something that one just wants to do. Oh well.
Oh, and this requires an out-of-tree patch for that udelay thingy.
Change-Id: If9e444366fb4c4a2fc592ca99e84048a9c501da1
diff --git a/board/czechlight/clearfog/linux.fragment b/board/czechlight/clearfog/linux.fragment
index 83cd006..43a563b 100644
--- a/board/czechlight/clearfog/linux.fragment
+++ b/board/czechlight/clearfog/linux.fragment
@@ -20,3 +20,6 @@
# SPI GPIO expander
CONFIG_PINCTRL_MCP23S08=y
+
+# For the Lumentum OCM
+CONFIG_SPI_SPIDEV=y