media: ipu-bridge: Fix Kconfig dependencies

The current Kconfig symbol dependencies allow having the following Kconfig
symbol values

CONFIG_IPU_BRIDGE=m
CONFIG_VIDEO_IPU3_CIO2=y
CONFIG_CIO2_BRIDGE=n

This does not work as the IPU bridge API is conditional to
IS_ENABLED(CONFIG_IPU_BRIDGE). Fix this by changing the dependencies so
that CONFIG_IPU_BRIDGE can be separately selected.

The CONFIG_CIO2_BRIDGE symbol becomes redundant as a result and is
removed.

Fixes: 2545a2c02ba1 ("media: ipu3-cio2: allow ipu_bridge to be a module again")
Suggested-by: Arnd Bergmann <[e-mail]>
Signed-off-by: Sakari Ailus <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

drivers/media/pci/intel/Kconfig

···
 # SPDX-License-Identifier: GPL-2.0-only
-config IPU_BRIDGE
-	tristate
-	depends on I2C && ACPI
-	help
-	  This is a helper module for the IPU bridge, which can be
-	  used by ipu3 and other drivers. In order to handle module
-	  dependencies, this is selected by each driver that needs it.
 
 source "drivers/media/pci/intel/ipu3/Kconfig"
 source "drivers/media/pci/intel/ivsc/Kconfig"
+
+config IPU_BRIDGE
+	tristate "Intel IPU Bridge"
+	depends on I2C && ACPI
+	help
+	  The IPU bridge is a helper library for Intel IPU drivers to
+	  function on systems shipped with Windows.
+
+	  Currently used by the ipu3-cio2 and atomisp drivers.
+
+	  Supported systems include:
+
+	  - Microsoft Surface models (except Surface Pro 3)
+	  - The Lenovo Miix line (for example the 510, 520, 710 and 720)
+	  - Dell 7285

drivers/media/pci/intel/ipu3/Kconfig

···
 config VIDEO_IPU3_CIO2
 	tristate "Intel ipu3-cio2 driver"
 	depends on VIDEO_DEV && PCI
+	depends on IPU_BRIDGE || !IPU_BRIDGE
 	depends on ACPI || COMPILE_TEST
 	depends on X86
 	select MEDIA_CONTROLLER
 	select VIDEO_V4L2_SUBDEV_API
 	select V4L2_FWNODE
 	select VIDEOBUF2_DMA_SG
-	select IPU_BRIDGE if CIO2_BRIDGE
 
 	help
 	  This is the Intel IPU3 CIO2 CSI-2 receiver unit, found in Intel
···
 	  Say Y or M here if you have a Skylake/Kaby Lake SoC with MIPI CSI-2
 	  connected camera.
 	  The module will be called ipu3-cio2.
-
-config CIO2_BRIDGE
-	bool "IPU3 CIO2 Sensors Bridge"
-	depends on VIDEO_IPU3_CIO2 && ACPI
-	depends on I2C
-	help
-	  This extension provides an API for the ipu3-cio2 driver to create
-	  connections to cameras that are hidden in the SSDB buffer in ACPI.
-	  It can be used to enable support for cameras in detachable / hybrid
-	  devices that ship with Windows.
-
-	  Say Y here if your device is a detachable / hybrid laptop that comes
-	  with Windows installed by the OEM, for example:
-
-		- Microsoft Surface models (except Surface Pro 3)
-		- The Lenovo Miix line (for example the 510, 520, 710 and 720)
-		- Dell 7285
-
-	  If in doubt, say N here.

drivers/staging/media/atomisp/Kconfig

···
 config VIDEO_ATOMISP
 	tristate "Intel Atom Image Signal Processor Driver"
 	depends on VIDEO_DEV && INTEL_ATOMISP
+	depends on IPU_BRIDGE
 	depends on MEDIA_PCI_SUPPORT
 	depends on PMIC_OPREGION
 	depends on I2C
 	select V4L2_FWNODE
 	select IOSF_MBI
-	select IPU_BRIDGE
 	select VIDEOBUF2_VMALLOC
 	select VIDEO_V4L2_SUBDEV_API
 	help