rpmsg: Add glink-bgcom driver for rpmsg framework

Add glink-bgcom driver which relies on bgcom as a transport
layer for sending data between various sub systems. Add
documentation file for the glink-bgcom driver.

Change-Id: I5eee03e6347a661dcefd083cea738b5d35fca848
Signed-off-by: Prudhvi Yarlagadda <pyarlaga@codeaurora.org>

Documentation/devicetree/bindings/soc/qcom/qcom,glink-bgcom-xprt.txt

@@ -0,0 +1,24 @@
+Qualcomm Technologies, Inc GLINK BGCOM transport (glink_bgcom_xprt) binding
+
+This binding describes the Qualcomm Technologies, Inc glink bgcom transport
+driver, a bgcom-spi based communication channel for sending data between the
+various subsystems in Qualcomm Technologies, Inc platforms.
+
+- compatible:
+	Usage: required
+	Value type: <stringlist>
+	Definition: must be "qcom,glink-bgcom-xprt"
+
+- label:
+	Usage: required
+	Value type: <stringlist>
+	Definition: must be "bg"
+
+= EXAMPLE
+
+The following example reprsents a glink_bgcom node.
+
+	qcom,glink-bgcom-xprt-bg {
+		compatible = "qcom,glink-bgcom-xprt";
+		label = "bg";
+	};

drivers/rpmsg/Kconfig

@@ -59,6 +59,15 @@ config RPMSG_QCOM_GLINK_SPI
 	  data to the appropriate SPI bus wire format and allows for GLINK
 	  communication with remote subsystems that are external to the SoC.
 
+config RPMSG_QCOM_GLINK_BGCOM
+	tristate "Qualcomm Technologies, Inc. BGCOM Glink driver"
+	help
+	  Say y here to enable support for the GLINK BGCOM driver,
+	  which provides support for using the GLINK communication protocol
+	  over BGCOM. This transport performs marshaling of GLINK commands and
+	  data to the appropriate BGCOM format and allows for GLINK
+	  communication with remote subsystems that are external to the SoC.
+
 config RPMSG_QCOM_SMD
 	tristate "Qualcomm Shared Memory Driver (SMD)"
 	depends on QCOM_SMEM

drivers/rpmsg/Makefile

@@ -6,6 +6,7 @@ obj-$(CONFIG_RPMSG_QCOM_GLINK_NATIVE) += qcom_glink_native.o
 obj-$(CONFIG_RPMSG_QCOM_GLINK_SMEM) += qcom_glink_smem.o
 obj-$(CONFIG_RPMSG_QCOM_GLINK_SPSS) += qcom_glink_spss.o
 obj-$(CONFIG_RPMSG_QCOM_GLINK_SPI) += qcom_glink_spi.o
+obj-$(CONFIG_RPMSG_QCOM_GLINK_BGCOM) += qcom_glink_bgcom.o
 obj-$(CONFIG_RPMSG_QCOM_SMD)	+= qcom_smd.o
 obj-$(CONFIG_RPMSG_VIRTIO)	+= virtio_rpmsg_bus.o
 obj-$(CONFIG_MSM_RPM_SMD)	+= rpm-smd.o

drivers/soc/qcom/Kconfig

@@ -723,7 +723,7 @@ config QCOM_GLINK
 
 config QCOM_GLINK_PKT
 	tristate "Enable device interface for GLINK packet channels"
-	depends on QCOM_GLINK
+	depends on QCOM_GLINK || RPMSG_QCOM_GLINK_BGCOM
 	help
 	  G-link packet driver provides the interface for the userspace
 	  clients to communicate over G-Link via device nodes.