bus: mhi: Move host MHI code to "host" directory

[ Upstream commit a0f5a630668cb8b2ebf5204f08e957875e991780 ]

In preparation of the endpoint MHI support, let's move the host MHI code
to its own "host" directory and adjust the toplevel MHI Kconfig & Makefile.

While at it, let's also move the "pci_generic" driver to "host" directory
as it is a host MHI controller driver.

Reviewed-by: Hemant Kumar <hemantk@codeaurora.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20220301160308.107452-5-manivannan.sadhasivam@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: 6a0c637bfee6 ("bus: mhi: host: Range check CHDBOFF and ERDBOFF")
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/bus/Makefile

@@ -38,4 +38,4 @@ obj-$(CONFIG_VEXPRESS_CONFIG)	+= vexpress-config.o
 obj-$(CONFIG_DA8XX_MSTPRI)	+= da8xx-mstpri.o
 
 # MHI
-obj-$(CONFIG_MHI_BUS)		+= mhi/
+obj-y				+= mhi/

drivers/bus/mhi/Kconfig

@@ -2,30 +2,7 @@
 #
 # MHI bus
 #
-# Copyright (c) 2018-2020, The Linux Foundation. All rights reserved.
+# Copyright (c) 2021, Linaro Ltd.
 #
 
-config MHI_BUS
-	tristate "Modem Host Interface (MHI) bus"
-	help
-	  Bus driver for MHI protocol. Modem Host Interface (MHI) is a
-	  communication protocol used by the host processors to control
-	  and communicate with modem devices over a high speed peripheral
-	  bus or shared memory.
-
-config MHI_BUS_DEBUG
-	bool "Debugfs support for the MHI bus"
-	depends on MHI_BUS && DEBUG_FS
-	help
-	  Enable debugfs support for use with the MHI transport. Allows
-	  reading and/or modifying some values within the MHI controller
-	  for debug and test purposes.
-
-config MHI_BUS_PCI_GENERIC
-	tristate "MHI PCI controller driver"
-	depends on MHI_BUS
-	depends on PCI
-	help
-	  This driver provides MHI PCI controller driver for devices such as
-	  Qualcomm SDX55 based PCIe modems.
-
+source "drivers/bus/mhi/host/Kconfig"

drivers/bus/mhi/Makefile

@@ -1,6 +1,2 @@
-# core layer
-obj-y += core/
-
-obj-$(CONFIG_MHI_BUS_PCI_GENERIC) += mhi_pci_generic.o
-mhi_pci_generic-y += pci_generic.o
-
+# Host MHI stack
+obj-y += host/

drivers/bus/mhi/host/Kconfig

@@ -0,0 +1,31 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# MHI bus
+#
+# Copyright (c) 2018-2020, The Linux Foundation. All rights reserved.
+#
+
+config MHI_BUS
+	tristate "Modem Host Interface (MHI) bus"
+	help
+	  Bus driver for MHI protocol. Modem Host Interface (MHI) is a
+	  communication protocol used by the host processors to control
+	  and communicate with modem devices over a high speed peripheral
+	  bus or shared memory.
+
+config MHI_BUS_DEBUG
+	bool "Debugfs support for the MHI bus"
+	depends on MHI_BUS && DEBUG_FS
+	help
+	  Enable debugfs support for use with the MHI transport. Allows
+	  reading and/or modifying some values within the MHI controller
+	  for debug and test purposes.
+
+config MHI_BUS_PCI_GENERIC
+	tristate "MHI PCI controller driver"
+	depends on MHI_BUS
+	depends on PCI
+	help
+	  This driver provides MHI PCI controller driver for devices such as
+	  Qualcomm SDX55 based PCIe modems.
+

drivers/bus/mhi/host/Makefile

@@ -1,4 +1,6 @@
 obj-$(CONFIG_MHI_BUS) += mhi.o
-
 mhi-y := init.o main.o pm.o boot.o
 mhi-$(CONFIG_MHI_BUS_DEBUG) += debugfs.o
+
+obj-$(CONFIG_MHI_BUS_PCI_GENERIC) += mhi_pci_generic.o
+mhi_pci_generic-y += pci_generic.o