media: pci: intel: Add IVSC support for IPU bridge driver

Previously on ACPI platforms, sensors that are intended to be connected
to an IPU device for use with the ipu3-cio2 driver lacking the necessary
connection information in firmware. IPU bridge driver is to connect
sensors to IPU device via software nodes.

Currently IVSC located between IPU device and sensors is available in
existing commercial platforms from multiple OEMs. But the connection
information between them in firmware is also not enough to build V4L2
connection graph. This patch parses the connection properties from the
SSDB buffer in DSDT and build the connection using software nodes.

IVSC driver is based on MEI framework (previously known as HECI), it
has two MEI clients, MEI CSI and MEI ACE. Both clients are used to
communicate messages with IVSC firmware. Linux abstracts MEI client
as a device, whose bus type is MEI. And the device is addressed by a
GUID/UUID which is part of the device name of MEI client. After figured
out MEI CSI via the UUID composed device name, this patch setup the
connection between MEI CSI and IPU, and the connection between MEI CSI
and sensor via software nodes.
Signed-off-by: Wentong Wu <wentong.wu@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

include/media/ipu-bridge.h

@@ -53,7 +53,12 @@ enum ipu_sensor_swnodes {
 	SWNODE_SENSOR_ENDPOINT,
 	SWNODE_IPU_PORT,
 	SWNODE_IPU_ENDPOINT,
-	/* Must be last because it is optional / maybe empty */
+	/* below are optional / maybe empty */
+	SWNODE_IVSC_HID,
+	SWNODE_IVSC_SENSOR_PORT,
+	SWNODE_IVSC_SENSOR_ENDPOINT,
+	SWNODE_IVSC_IPU_PORT,
+	SWNODE_IVSC_IPU_ENDPOINT,
 	SWNODE_VCM,
 	SWNODE_COUNT
 };
@@ -100,6 +105,8 @@ struct ipu_property_names {
 
 struct ipu_node_names {
 	char port[7];
+	char ivsc_sensor_port[7];
+	char ivsc_ipu_port[7];
 	char endpoint[11];
 	char remote_port[7];
 	char vcm[16];
@@ -116,6 +123,10 @@ struct ipu_sensor {
 	char name[ACPI_ID_LEN + 4];
 	struct acpi_device *adev;
 
+	struct device *csi_dev;
+	struct acpi_device *ivsc_adev;
+	char ivsc_name[ACPI_ID_LEN + 4];
+
 	/* SWNODE_COUNT + 1 for terminating NULL */
 	const struct software_node *group[SWNODE_COUNT + 1];
 	struct software_node swnodes[SWNODE_COUNT];
@@ -132,9 +143,15 @@ struct ipu_sensor {
 	struct property_entry ep_properties[5];
 	struct property_entry dev_properties[5];
 	struct property_entry ipu_properties[3];
+	struct property_entry ivsc_properties[1];
+	struct property_entry ivsc_sensor_ep_properties[4];
+	struct property_entry ivsc_ipu_ep_properties[4];
+
 	struct software_node_ref_args local_ref[1];
 	struct software_node_ref_args remote_ref[1];
 	struct software_node_ref_args vcm_ref[1];
+	struct software_node_ref_args ivsc_sensor_ref[1];
+	struct software_node_ref_args ivsc_ipu_ref[1];
 };
 
 typedef int (*ipu_parse_sensor_fwnode_t)(struct acpi_device *adev,