Document Device tree bindings for the quad SPI peripheral
found on Microchip PIC32 class devices.
Signed-off-by: NPurna Chandra Mandal <purna.mandal@microchip.com>
Acked-by: NRob Herring <rob@kernel.org>

Cc: Kumar Gala <galak@codeaurora.org>
Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: NMark Brown <broonie@kernel.org>