[PATCH v6 RESEND 0/2] Add support for ANX7688

[Dafna Hirschfeld <dafna.hirschfeld@collabora.com>]

(resending patchset with Rb tags)
ANX7688 is a typec port controller that also converts HDMI to DP.
It is found on Acer Chromebook R13 (elm) and on Pine64 PinePhone.

On Acer Chromebook R13 (elm), the device is powered-up and controller by the
Embedded Controller. Therefore its operation is transparent
to the SoC. It is used in elm only as a display bridge driver.
The bridge driver only reads some values using i2c and use them to
implement the mode_fixup cb.

On v5 we added the full dt-binding of the generic Analogix anx7688 device.
The problem is that for elm, most of the fields are not needed since
the anx7688 sits behind the EC. After a discussion on v5 (see [1])
we decided to go back to the original approach and send the dt binding
as specific to the elm. So in this version we rename the device to cros_ec_anx7688
and use the compatible 'google,cros-ec-anx7688'.

[1] https://patchwork.kernel.org/project/dri-devel/patch/20210305124351.15079-3-dafna.hirschfeld@collabora.com/

Changes since v5:
* treat the device as a specific combination of an ANX7688 behind the EC and
call it 'cros-ec-anx7688'

Changes since v4:
In v4 of this set, the device was added as an 'mfd' device
and an additional 'bridge' device for the HDMI-DP conversion, see [2].

[2] https://lkml.org/lkml/2020/3/18/64

Dafna Hirschfeld (1):
  dt-bindings: display: add google,cros-ec-anx7688.yaml

Enric Balletbo i Serra (1):
  drm/bridge: Add ChromeOS EC ANX7688 bridge driver support

 .../bridge/google,cros-ec-anx7688.yaml        |  82 ++++++++
 drivers/gpu/drm/bridge/Kconfig                |  12 ++
 drivers/gpu/drm/bridge/Makefile               |   1 +
 drivers/gpu/drm/bridge/cros-ec-anx7688.c      | 191 ++++++++++++++++++
 4 files changed, 286 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/google,cros-ec-anx7688.yaml
 create mode 100644 drivers/gpu/drm/bridge/cros-ec-anx7688.c

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