dt-bindings: trivial-devices: Document CPLD on Menlo boards

The CPLD on Menlo boards is used to operate custom hardware,
document the CPLD DT binding as trivial SPI device.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: NXP Linux Team <linux-imx@nxp.com>
To: linux-spi@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220407210131.256045-1-marex@denx.de

Documentation/devicetree/bindings/trivial-devices.yaml

@@ -217,6 +217,8 @@ properties:
           - memsic,mxc6255
             # MEMSIC 3-axis accelerometer
           - memsic,mxc6655
+            # Menlo on-board CPLD trivial SPI device
+          - menlo,m53cpld
             # Microchip differential I2C ADC, 1 Channel, 18 bit
           - microchip,mcp3421
             # Microchip differential I2C ADC, 2 Channel, 18 bit