[PATCH v4 0/3] Add ilitek ili9341 panel driver

[dillon.minfei@gmail.com]

From: Dillon Min <dillon.minfei@gmail.com>

Since the st,sf-tc240t-9370-t dts binding already exist in stm32f429-disco.dts
but, the panel driver didn't get accepted from mainline. it's time to submit
patch fot it.

This driver can support two different interface by different dts bindings:
- spi+dpi, use spi to configure register, dpi for graphic data.
  st,sf-tc240t-9370-t
- only spi, just like tiny/ili9341.c (actually, this part is copy from tiny)
  adafruit,yx240qv29

I was submited the first patch last year, you can find it at [1].
this patch has one major difference from that one, which is replace the low
level communication way, from spi_sync() to mipi_dbi_{command,
command_stackbuf}() interface, referred from Linus's patch [2].

both the two dpi/dbi interface was tested on stm32f429-disco board, if anyone
want to verify this patch, you need apply the clk patch for this board first,
you can get it from [3].

[1] "drm/panel: Add ilitek ili9341 panel driver"
https://lore.kernel.org/lkml/1590378348-8115-7-git-send-email-dillon.minfei@gmail.com/

[2] "drm/panel: s6e63m0: Switch to DBI abstraction for SPI"
https://lore.kernel.org/dri-devel/20210611214243.669892-1-linus.walleij@linaro.org/

[3]
https://lore.kernel.org/lkml/1590378348-8115-6-git-send-email-dillon.minfei@gmail.com/

v4:
- fix m68k-allmodconfig build error which reported by lkp, thanks.
- add Copyright 2018 David Lechner <david@lechnology.com>.
v3 link:
https://lore.kernel.org/lkml/1627013203-23099-1-git-send-email-dillon.minfei@gmail.com/

v3:
- add Fixes tags.
- collect reviewed-by tags from linus and jagan.
- replace DRM_ERROR() with dev_err() or drm_err().
- remove kernel-doc markers from struct ili9341_config{}.
- reorder include headers.
- remove the struct device *dev from struct ili9341{}.
- restructure the ili9341_probe() function, add two ili9341_{dbi,dpi)_probe()
  to make it more readable according to jagan's suggestion, thanks.

for the full drm driver exist in drm/panel need Sam and Laurent's feedback.
so, not cover this part at this time, will be update later.

v2 link:
https://lore.kernel.org/lkml/1626853288-31223-1-git-send-email-dillon.minfei@gmail.com/

v2:
- replace vcc regulator to bulk regulators in driver, from linus suggestion.
- fix dtbs_check warnings on ili9341 dts binding check.
- add bulk regulation node in ilitek,ili9341.yaml.
v1 link:
https://lore.kernel.org/lkml/1626430843-23823-1-git-send-email-dillon.minfei@gmail.com/

Dillon Min (3):
  dt-bindings: display: panel: Add ilitek ili9341 panel bindings
  ARM: dts: stm32: fix dtbs_check warning on ili9341 dts binding
  drm/panel: Add ilitek ili9341 panel driver

 .../bindings/display/panel/ilitek,ili9341.yaml     |  78 ++
 arch/arm/boot/dts/stm32f429-disco.dts              |   2 +-
 drivers/gpu/drm/panel/Kconfig                      |  12 +
 drivers/gpu/drm/panel/Makefile                     |   1 +
 drivers/gpu/drm/panel/panel-ilitek-ili9341.c       | 792 +++++++++++++++++++++
 5 files changed, 884 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/display/panel/ilitek,ili9341.yaml
 create mode 100644 drivers/gpu/drm/panel/panel-ilitek-ili9341.c

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1.9.1