Howdy.
I came into possession of a mikroBUS Cape
(http://beagleboard.org/project/mikrobus) and have been using it to learn
how to write a .dts overlay. Since there are 4 slots for clickboards on
the cape and I have 4 SPI boards (4-20mA T Click), I figured I'd try to
create a single .dts that exposed all 4 as SPI devices.
Ignoring SPI0 (routed to "Host 3" on the mikroBUS Cape) for now, I have
Host 1 and Host 2 working. These map directly to SPI1.0 and SPI1.1, but I
cannot get a "SPI1.2" enabled (Host4). The mikroBUS Cape schematic shows
that chipselect for Host 4 is routed to P8.10, so I thought I could add
that pin (gpio2_4) as OUTPUT_PULLUP | MODE 7, and then simply add a third
fragment for the third chipselect.
spi1@2 {
#address-cells = <1>;
#size-cells = <0>;
compatible = "spidev";
reg = <2>;
spi-max-frequency = <16000000>;
spi-cpol;
spi-cpha;
};
Unfortunately this fails with a "cs2 >= max2" error when I load the overlay.
Reading around I'm trying to figure out, okay, how do I increase the number
of SPI devices on the SPI1 bus. I've read about:
num-cs
num-chipselects
cs-gpios
When using cs-gpios like this:
cs-gpios = <0>, <1>, <&gpio3 4 0>;
I get
[ 171.494015] /ocp/spi@481a0000: could not get #gpio-cells for
/ocp/interrupt-controller@48200000
My complete dts is at http://pastebin.com/BvxZ3fa2
TL;DR: How can I enable a 3rd chipselect for SPI1 where the CS is mapped
to P8.11 (gpio2[4])?
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