[PATCH v4 0/7] drm/i2c: adv7511: ADV7533 support

[Archit Taneja]

ADV7533 is a DSI to HDMI encoder chip. It's like ADV7511, but with an
additional DSI RX block that takes in DSI video mode output.

Trying to get this driver merged has had some challenges:

- ADV7533 has an I2C control bus, but acts as a DSI peripheral too.
  After discussions, it was concluded that we'd want to provide an
  API to create MIPI DSI devices, rather than expose two different
  interfaces on DT. The first version [1] tried the former approach
  the second version [2] showed how the driver would look like if
  exposed 2 DT nodes. This lateset patchset relies on the MIPI DSI
  device creation API provided by [3], this has been accepted and
  should be merged for 4.6.

- The driver was designed as an I2C slave encoder. When ADV7533
  patches were posted [1], it was modelled as a bridge, but ADV7511
  and others were still left as I2C slave encoders. This wasn't
  accepted. After discussions, it was decided that ADV7511 too would
  be converted into a bridge driver, and all the users of ADV7511
  should assume it is a bridge. This bridge conversion was done in
  [4]. There is still some debate over whether the bridge driver be
  involved in the connector creation, or the KMS driver that has
  the whole view of the display pipeline. This discussion shouldn't
  affect this patch set, though.

This patch set enables ADV7533 support with the above two issues
now resolved. It also incorporates ADV7533 specific features and fixes
that we've discovered since the first version of this patch was posted.

Changes in v4:
- Separated out build for ADV7533. The original plan was to stub out the
  drm_mipi_dsi funcs, but that seemed like an overkill since it helped
  just this driver. It seems better to stub out the ADV7533 functionality
  altogether instead.
- Some minor DT binding corrections suggested by Laurent.

[4]
https://lists.freedesktop.org/archives/dri-devel/2016-January/098287.html

[3]
https://lkml.org/lkml/2016/2/12/67

[2]
https://lists.freedesktop.org/archives/dri-devel/2015-September/089884.html

[1]:
https://lists.freedesktop.org/archives/dri-devel/2015-July/087088.html

Archit Taneja (7):
  drm/i2c: adv7511: Convert to drm_bridge
  drm/i2c: adv7511: Fix mutex deadlock when interrupts are disabled
  drm/i2c: adv7511: Initial support for ADV7533
  drm/i2c: adv7533: Create a MIPI DSI device
  drm/i2c: adv7533: Use internal timing generator
  drm/i2c: adv7533: Change number of DSI lanes dynamically
  dt-bindings: drm/bridge: Update bindings for ADV7533

 .../bindings/display/bridge/adi,adv7511.txt        |  26 +-
 drivers/gpu/drm/i2c/Kconfig                        |   8 +
 drivers/gpu/drm/i2c/Makefile                       |   4 +-
 drivers/gpu/drm/i2c/adv7511.c                      | 333 ++++++++++++++-------
 drivers/gpu/drm/i2c/adv7511.h                      |  95 ++++++
 drivers/gpu/drm/i2c/adv7533.c                      | 265 ++++++++++++++++
 6 files changed, 613 insertions(+), 118 deletions(-)
 create mode 100644 drivers/gpu/drm/i2c/adv7533.c

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