Qualcomm technologies Inc bg-spi

BG-COM SPI : bg-spi is used for the  communication with Blackghost
chipset. It uses SPI protocol for communication.
BG-COM: bgcome is a thin transport layer over glink which provides
the read/write APIs to communicate with Blackghost chipset.

Required properties:
- compatible : should be "qcom,bg-spi"
- spi-max-frequency : Maximum SPI clocking speed of device in Hz
- qcom,irq-gpio : GPIO pin
- reg : Register set

Example:
	spi@78b6000 { /* BLSP1 QUP2 */
		status = "ok";
		qcom,bg-spi {
			compatible = "qcom,bg-spi";
			reg = <0>;
			spi-max-frequency = <19200000>;
			interrupt-parent = <&msm_gpio>;
			qcom,irq-gpio = <&msm_gpio 110 1>;
		};
	};