[PATCH v7 0/2] media: rcar-csi2: add Renesas R-Car MIPI CSI-2 support

["Niklas Söderlund" <niklas.soderlund@ragnatech.se>]

From: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>

Hi,

This is the latest incarnation of R-Car MIPI CSI-2 receiver driver. It's
based on top of v4.12-rc1 and are tested on Renesas Salvator-X together
with the out of tree patches for rcar-vin to add support for Gen3 VIN
and a prototype driver for ADV7482. If anyone is interested to test
video grabbing using these out of tree patches please see [1].

It depends on the patches:

- [GIT PULL FOR v4.13] V4L2 fwnode support
- [PATCH v2 0/2] v4l2-async: add subnotifier registration for subdevices
- [PATCH v2 0/2] media: entity: add operation to help map DT node to media pad

Changes since v6:
- Rebased on top of Sakaris fwnode patches.
- Changed of RCAR_CSI2_PAD_MAX to NR_OF_RCAR_CSI2_PAD.
- Remove assumtion about unkown medis bus type, thanks Sakari for 
  pointing this out.
- Created table for supported format information instead of scattering 
  this information around the driver, thanks Sakari!
- Small newline fixes and reduce some indentation levels.

Changes since v5:
- Make use of the incremental async subnotifer and helper to map DT 
  endpoint to media pad number. This moves functionality which
  previously in the Gen3 patches for R-Car VIN driver to this R-Car
  CSI-2 driver. This is done in preparation to support the ADV7482
  driver in development by Kieran which will register more then one
  subdevice and the CSI-2 driver needs to cope wit this. Further more it
  prepares the driver for another use-case where more then one subdevice
  is present upstream for the CSI-2.
- Small cleanups.
- Add explicit include for linux/io.h, thanks Kieran.

Changes since v4:
- Match SoC part numbers and drop trailing space in documentation, 
  thanks Geert for pointing this out.
- Clarify that the driver is a CSI-2 receiver by supervised 
  s/interface/receiver/, thanks Laurent.
- Add entries in Kconfig and Makefile alphabetically instead of append.
- Rename struct rcar_csi2 member swap to lane_swap.
- Remove macros to wrap calls to dev_{dbg,info,warn,err}.
- Add wrappers for ioread32 and iowrite32.
- Remove unused interrupt handler, but keep checking in probe that there 
  are a interrupt define in DT.
- Rework how to wait for LP-11 state, thanks Laurent for the great idea!
- Remove unneeded delay in rcar_csi2_reset()
- Remove check for duplicated lane id:s from DT parsing. Broken out to a 
  separate patch adding this check directly to v4l2_of_parse_endpoint().
- Fixed rcar_csi2_start() to ask it's source subdevice for information 
  about pixel rate and frame format. With this change having
  {set,get}_fmt operations became redundant, it was only used for
  figuring out this out so dropped them.
- Tabulated frequency settings map.
- Dropped V4L2_SUBDEV_FL_HAS_DEVNODE it should never have been set.
- Switched from MEDIA_ENT_F_ATV_DECODER to 
  MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER as entity function. I can't
  find a more suitable function, and what the hardware do is to fetch
  video from an external chip and passes it on to a another SoC internal
  IP it's sort of a formatter.
- Break out DT documentation and code in two patches.

Changes since v3:
- Update DT binding documentation with input from Geert Uytterhoeven,
  thanks!

Changes since v2:
- Added media control pads as this is needed by the new rcar-vin driver.
- Update DT bindings after review comments and to add r8a7796 support.
- Add get_fmt handler.
- Fix media bus format error s/YUYV8/UYVY8/

Changes since v1:
- Drop dependency on a pad aware s_stream operation.
- Use the DT bindings format "renesas,<soctype>-<device>", thanks Geert
  for pointing this out.

1. http://elinux.org/R-Car/Tests:rcar-vin

Niklas Söderlund (2):
  media: rcar-csi2: add Renesas R-Car MIPI CSI-2 receiver documentation
  media: rcar-csi2: add Renesas R-Car MIPI CSI-2 receiver driver

 .../devicetree/bindings/media/rcar-csi2.txt        | 116 +++
 drivers/media/platform/rcar-vin/Kconfig            |  12 +
 drivers/media/platform/rcar-vin/Makefile           |   1 +
 drivers/media/platform/rcar-vin/rcar-csi2.c        | 867 +++++++++++++++++++++
 4 files changed, 996 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/rcar-csi2.txt
 create mode 100644 drivers/media/platform/rcar-vin/rcar-csi2.c

-- 
2.13.0