[patch v3 0/9] rk3399 (Pinebook pro) EDP support

[Arnaud Patard (Rtp)]

This patchset add support for the rk3399 eDP. It has been tested on the pinebook
pro and Google Kevin chromeos devices.

The changes have been written by studying the linux code, since I didn't find any
manual for theses part of the RK3399 SoC.

On the linux kernel side, on recent kernels, it needs commit "pwm: rockchip: Keep 
enabled PWMs running while probing" otherwise the pinebook pro will freeze when probing
the display.

Changes since v2:
- Respect alphabetical order in uboot.dtsi in patch "rk3399-pinebook-pro-u-boot.dtsi: Enable edp"
- drop "configs/pinebook-pro-rk3399_defconfig: enable SYS_USB_EVENT_POLL_VIA_INT_QUEUE"
  (pbp_defconfig_usb_poll.patch) patch, since the same change has been merged with change
  https://gitlab.denx.de/u-boot/custodians/u-boot-rockchip/-/commit/b197c934b11f611dcc1a083d90e68019d1e010cf
- change patch subjects.

Changes since v1:
- Add reset support for the VOP and eDP. This was needed and it appears to also solve 
  the issue with warm reset.
- Fix a debug string in the vop driver
- Drop the patch "drivers/video/rockchip/rk_edp.c: Change clock rate".
- Address various comments