From: Drew Fustini <drew@pdp7.com>
Date: Wed, 21 Nov 2018 18:46:31 +0000 (+0000)
Subject: Add SPI pins for BeagleBone Black
X-Git-Tag: 0.3.0^2~2
X-Git-Url: https://git.ayoreis.com/Adafruit_Blinka-hackapet.git/commitdiff_plain/ff59972e7de13da1ee3c592b2ddf45e8fdd2225f?ds=inline;hp=ff59972e7de13da1ee3c592b2ddf45e8fdd2225f

Add SPI pins for BeagleBone Black

Refer to header default pin modes
http://beagleboard.org/static/images/cape-headers.png

P9_17 (SPI0_CSO => CE0) enables peripheral device
P9_18 (SPI0_D1 => MOSI) outputs data to peripheral device
P9_21 (SPIO_DO => MISO) receives data from peripheral device
P9_22 (SPI0_SCLK => SCLK) outputs clock signal

Use config-pin to set pin mode for SPI pins
https://github.com/beagleboard/bb.org-overlays/tree/master/tools/beaglebone-universal-io

config-pin p9.17 spi_cs
config-pin p9.18 spi
config-pin p9.21 spi
config-pin p9.22 spi_sclk
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