[PATCH v5] of: add display helper (was: of: add videomode helper)

[Steffen Trumtrar <s.trumtrar@pengutronix.de>]

Hi!

After the feedback I got on v4, I thought about the current state of the 
videomode helper and decided to reengineer it. The most confusion seems to
stem from the fact, that a videomode does not have ranges. And that is correct.
Therefore the description of the display now uses a list of timings.
These timings support ranges, as they do in datasheets (min/typ/max).

A device driver may choose to grep a display-description from the devicetree and
directly work with that (matching parameters according to their range etc.).
Or one can use the former struct videomode to convert from the timings to a videomode
(at the moment it just grabs the typical-value from every timing-parameter).
This videomode on the other hand, can then be converted to a mode the backend wants
(drm_mode_info, fb_videomode,...).
As of now, this intermediate step is a bit, well, unnecessary. But it provides a way
to have a generic videomode and functions to possibly convert back-and-forth.
In the end, this version does the same as of_videomode, but I hope makes the whole
thing a little clearer.

Thanks to everybody who reviewed the previous versions.
Feedback is always welcome.

Regards,
Steffen


----------------------------------------------------------------
Steffen Trumtrar (2):
      of: add helper to parse display specs
      video: add generic videomode description

 Documentation/devicetree/bindings/video/display |  208 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 drivers/of/Kconfig                              |    5 +++
 drivers/of/Makefile                             |    1 +
 drivers/of/of_display.c                         |  157 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 drivers/video/Makefile                          |    1 +
 drivers/video/videomode.c                       |  146 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/display.h                         |   85 ++++++++++++++++++++++++++++++++++++++++++
 include/linux/of_display.h                      |   15 ++++++++
 include/linux/videomode.h                       |   38 +++++++++++++++++++
 9 files changed, 656 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/video/display
 create mode 100644 drivers/of/of_display.c
 create mode 100644 drivers/video/videomode.c
 create mode 100644 include/linux/display.h
 create mode 100644 include/linux/of_display.h
 create mode 100644 include/linux/videomode.h