[v1,00/17] Add support for SDM845 Camera Subsystem

This series implements support for the camera subsystem found in
the SDM845 SOCs and the Titan 170 ISP. The support is partial
in that it implements CSIPHY, CSID, and partial VFE support.

The Titan generation of the ISP diverges a fair amount from the
design of the previous architecture generation, CAMSS. As a result
some pretty invasive refactoring is done in this series. It also
means that at this time we're unable to implement support for all
of the IP blocks contained. This is due to a combination of legal
considerations with respect to the IP and its owner Qualcomm and
time & man hour constrains on the Linaro side.

The CSIPHY (CSI Physical Layer) & CSID (CSI Decoder) support is
complete, but the VFE (Video Front End, which is referred to as IFE
(Image Front End) in the Titan generation of ISPs) only has support
for the RDI (Raw Dump Interface) which allows the raw output of
the CSID to be written to memory.

The 2nd interface implemented in the VFE silicon is the PIX
interface, and camss does not support it for this generation of ISPs.
The reason for this is that the PIX interface is used for sending
image data to the BPS (Bayer Processing Section) & IPE (Image
Processing Engine), but both of these units are beyond the scope
of enabling basic ISP functionality for the SDM845.

Since the Titan architecture generation diverges quite a bit from
the CAMSS generation, a lot of pretty major refactoring is carried
out in this series. Both the CSID & VFE core paths are made more
general and hardware version specific parts are broken out.
The CSIPHY didn't require quite as radical changes and therefore
keeps its current form.

Tested on:
 - Qcom RB3 / db845c + camera mezzanine, which is SDM845 based
 - db410c + D3 Camera mezzanine, which is APQ8016 based
 
Branch:
 - https://git.linaro.org/people/robert.foss/linux.git/log/?h=camss_sdm845_v1


Robert Foss (17):
  media: camss: Fix comment using wrong function name
  media: camss: Fix vfe_isr comment typo
  media: camss: Add CAMSS_845 camss version
  media: camss: Make ISPIF subdevice optional
  media: camss: Refactor VFE HW version support
  media: camss: Add support for VFE hardware version Titan 170
  media: camss: Add missing format identifiers
  media: camss: Refactor CSID HW version support
  media: camss: Add support for CSID hardware version Titan 170
  media: camss: Add support for CSIPHY hardware version Titan 170
  media: camss: Remove per VFE power domain toggling
  media: dt-bindings: media: qcom,camss: Add bindings for SDM845 camss
  media: camss: Enable SDM845
  arm64: defconfig: Build Qcom CAMSS as module
  arm64: dts: sdm845: Add CAMSS ISP node
  arm64: dts: sdm845-db845c: Add CAMSS ISP node
  arm64: dts: sdm845-db845c: Enable ov8856 sensor and connect to ISP

 .../devicetree/bindings/media/qcom,camss.txt  |   51 +-
 arch/arm64/boot/dts/qcom/sdm845-db845c.dts    |   28 +-
 arch/arm64/boot/dts/qcom/sdm845.dtsi          |  151 +++
 arch/arm64/configs/defconfig                  |    1 +
 drivers/media/platform/qcom/camss/Makefile    |    6 +
 .../platform/qcom/camss/camss-csid-170.c      |  602 +++++++++
 .../platform/qcom/camss/camss-csid-4-1.c      |  338 +++++
 .../platform/qcom/camss/camss-csid-4-7.c      |  406 ++++++
 .../media/platform/qcom/camss/camss-csid.c    |  620 +--------
 .../media/platform/qcom/camss/camss-csid.h    |  177 ++-
 .../qcom/camss/camss-csiphy-3ph-1-0.c         |  182 ++-
 .../media/platform/qcom/camss/camss-csiphy.c  |   66 +-
 .../media/platform/qcom/camss/camss-ispif.c   |  147 ++-
 .../media/platform/qcom/camss/camss-ispif.h   |    3 +-
 .../media/platform/qcom/camss/camss-vfe-170.c |  808 ++++++++++++
 .../media/platform/qcom/camss/camss-vfe-4-1.c |  119 +-
 .../media/platform/qcom/camss/camss-vfe-4-7.c |  240 ++--
 .../media/platform/qcom/camss/camss-vfe-4-8.c | 1166 +++++++++++++++++
 .../platform/qcom/camss/camss-vfe-gen1.c      |  760 +++++++++++
 .../platform/qcom/camss/camss-vfe-gen1.h      |  110 ++
 drivers/media/platform/qcom/camss/camss-vfe.c |  838 +-----------
 drivers/media/platform/qcom/camss/camss-vfe.h |  118 +-
 .../media/platform/qcom/camss/camss-video.c   |  100 ++
 drivers/media/platform/qcom/camss/camss.c     |  421 ++++--
 drivers/media/platform/qcom/camss/camss.h     |   17 +-
 25 files changed, 5630 insertions(+), 1845 deletions(-)
 create mode 100644 drivers/media/platform/qcom/camss/camss-csid-170.c
 create mode 100644 drivers/media/platform/qcom/camss/camss-csid-4-1.c
 create mode 100644 drivers/media/platform/qcom/camss/camss-csid-4-7.c
 create mode 100644 drivers/media/platform/qcom/camss/camss-vfe-170.c
 create mode 100644 drivers/media/platform/qcom/camss/camss-vfe-4-8.c
 create mode 100644 drivers/media/platform/qcom/camss/camss-vfe-gen1.c
 create mode 100644 drivers/media/platform/qcom/camss/camss-vfe-gen1.h