RFC MIPS: CI20: add HDMI out support

+++ help is needed: driver is not completely working and shows no output signal on the HDMI data and clock lanes +++ HPD is working and /dev/fb0 does appear
+++ but there is no trigger to initialize the lcdc

* add definition for second jz4780-lcdc
* diverse fixes for yaml schema
* make ingenic-drm driver compatible to ingenic,jz4780-lcd
* converted existing ingenic,lcd.txt to ingenic,lcd.yaml - suggested by Paul Cercueil <[email protected]>
* removed blank line before MODULE_DEVICE_TABLE() macro - Paul Cercueil <[email protected]>
* added some missing Signed-off:
* removed Zubair Lutfullah Kakakhel <[email protected]> from the
recipients list and Cc: since the address is no longer available.
* removed "pinctrl: ingenic: add hdmi-ddc pin control group" from this patch
series since it is already applied elsewhere (by Linus Walleij <[email protected]>)

RFC V2 2020-02-28 19:19:40:
* Converted .txt bindings to .yaml (by Sam Ravnborg <[email protected]> - big THANKS)

RFC V1 2020-02-26 20:13:06:
This patch series adds HDMI output to the jz4780/CI20 board.

It is based on taking the old 3.18 vendor kernel as well as an earlier submission from 2015:
https://lore.kernel.org/patchwork/patch/547872/
and trying to achieve the same with modern DTS setup and new/modified drivers.

Unfortunately, in this first RFC, only EDID and creation of /dev/fb0 are working. Also, HDMI hot plugging is detected.

But there is no HDMI output signal. So some tiny piece seems to be missing to enable/configure the Synposys HDMI controller.

We need help from the community to fix this.

Original authors of most patches are
* Paul Boddie <[email protected]>
* Zubair Lutfullah Kakakhel <[email protected]>

H. Nikolaus Schaller (4):
dt-bindings: display: convert ingenic,lcd.txt to ingenic,lcd.yaml
drm: ingenic-drm: add MODULE_DEVICE_TABLE
drm: ingenic-drm: add support for ingenic,jz4780-lcd
MIPS: CI20: defconfig: configure for DRM_DW_HDMI_JZ4780

Paul Boddie (3):
drm: ingenic: add jz4780 Synopsys HDMI driver
MIPS: DTS: jz4780: account for Synopsys HDMI driver and LCD controller
MIPS: DTS: CI20: add HDMI setup

Sam Ravnborg (1):
dt-bindings: display: add ingenic-jz4780-hdmi DT Schema

 .../bindings/display/ingenic,lcd.txt          |  45 ------
 .../bindings/display/ingenic,lcd.yaml         | 128 ++++++++++++++++++
 .../bindings/display/ingenic-jz4780-hdmi.yaml |  82 +++++++++++
 arch/mips/boot/dts/ingenic/ci20.dts           |  64 +++++++++
 arch/mips/boot/dts/ingenic/jz4780.dtsi        |  46 +++++++
 arch/mips/configs/ci20_defconfig              |   3 +
 drivers/gpu/drm/ingenic/Kconfig               |   8 ++
 drivers/gpu/drm/ingenic/Makefile              |   1 +
 drivers/gpu/drm/ingenic/dw_hdmi-jz4780.c      | 120 ++++++++++++++++
 drivers/gpu/drm/ingenic/ingenic-drm.c         |   8 ++
 10 files changed, 460 insertions(+), 45 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/display/ingenic,lcd.txt
 create mode 100644 Documentation/devicetree/bindings/display/ingenic,lcd.yaml
 create mode 100644 Documentation/devicetree/bindings/display/ingenic-jz4780-hdmi.yaml
 create mode 100644 drivers/gpu/drm/ingenic/dw_hdmi-jz4780.c

2.25.1