[PATCH v7 00/14] Add some DRM bridge drivers support for i.MX8qm/qxp SoCs

[Liu Ying <victor.liu@nxp.com>]

Hi,

This is the v7 series to add some DRM bridge drivers support
for i.MX8qm/qxp SoCs.

The bridges may chain one by one to form display pipes to support
LVDS displays.  The relevant display controller is DPU embedded in
i.MX8qm/qxp SoCs.

The DPU KMS driver can be found at:
https://www.spinics.net/lists/devicetree/msg414766.html

This series supports the following display pipes:
1) i.MX8qxp:
prefetch eng -> DPU -> pixel combiner -> pixel link ->
pixel link to DPI(PXL2DPI) -> LVDS display bridge(LDB)

2) i.MX8qm:
prefetch eng -> DPU -> pixel combiner -> pixel link -> LVDS display bridge(LDB)


This series dropped the patch 'phy: Add LVDS configuration options', as
suggested by Robert Foss, because it has already been sent with the following
series to add Mixel combo PHY found in i.MX8qxp:
https://www.spinics.net/lists/devicetree/msg414149.html

So, this version depends on that series.


Patch 1/14 and 2/14 add bus formats used by pixel combiner.

Patch 7/14 adds dt-binding for Control and Status Registers module(a syscon
used by PXL2DPI and LDB), which references the PXL2DPI and LDB schemas.

Patch 10/14 adds a helper for LDB bridge drivers.

Patch 3/14 ~ 6/14, 8/14, 9/14 and 11/14 ~ 13/14 add drm bridge drivers and
dt-bindings support for the bridges.

Patch 14/14 updates MAINTAINERS.


I've tested this series with a koe,tx26d202vm0bwa dual link LVDS panel and
a LVDS to HDMI bridge(with a downstream drm bridge driver).

Marcel Ziswiler has tested v6 with two LVDS panels(single link LT170410-2WHC
and dual link LP156WF1) on Toradex Colibri iMX8X.


Welcome comments, thanks.

v6->v7:
* Fix complaints from 'checkpatch.pl --strict' on the LDB DRM bridge helper
  driver(patch 10/14) and some DRM bridge drivers(patch 9/14, 12/14 and 13/14).
  (Robert)
* Fix complaints from 'checkpatch --strict' on the rest DRM bridge
  drivers(patch 4/14 and 6/14).
* A trivial indentation fix for patch 9/14. (Robert)
* Add Robert's R-b tags on patch 9/14, 10/14, 12/14, 13/14 and 14/14.
* Add Marcel's T-b tags on all DRM bridge drivers.
* Add Rob's R-b tag on patch 7/14 for CSR module dt-binding.

v5->v6:
* Fix data organizations in documentation(patch 2/14) for
  MEDIA_BUS_FMT_RGB{666,888}_1X30-CPADLO. (Laurent)
* Add Laurent's R-b tags on patch 1/14 and 2/14.
* Drop 'select' schema from the CSR dt-binding documentation(patch 7/14). (Rob)
* Add Rob's R-b tag on patch 8/14.

v4->v5:
* Drop the patch 'phy: Add LVDS configuration options'. (Robert)
* Add Robert's R-b tags on patch 1/14, 2/14, 4/14 and 6/14.
* Drop the 'PC_BUF_PARA_REG' register definition from the pixel combiner bridge
  driver(patch 4/14). (Robert)
* Make a comment occupy a line in the pixel link bridge driver(patch 6/14).
  (Robert)
* Introduce a new patch(patch 7/14) to add dt-binding for Control and Status
  Registers module. (Rob)
* Make imx-ldb-helper be a pure object to be linked with i.MX8qxp LDB bridge
  driver and i.MX8qm LDB bridge driver, instead of a module.  Correspondingly,
  rename 'imx8{qm, qxp}-ldb.c' to 'imx8{qm, qxp}-ldb-drv.c'. (Robert)
* Move 'imx_ldb_helper.h' to 'drivers/gpu/drm/bridge/imx/imx-ldb-helper.h'.
  (Robert)
* s/__FSL_IMX_LDB__/__IMX_LDB_HELPER__/  for 'imx-ldb-helper.h'.

v3->v4:
* Use 'fsl,sc-resource' DT property to get the SCU resource ID associated with
  the PXL2DPI instance instead of using alias ID. (Rob)
* Add Rob's R-b tag on patch 11/14.

v2->v3:
* Drop 'fsl,syscon' DT properties from fsl,imx8qxp-ldb.yaml and
  fsl,imx8qxp-pxl2dpi.yaml. (Rob)
* Mention the CSR module controls LDB and PXL2DPI in fsl,imx8qxp-ldb.yaml and
  fsl,imx8qxp-pxl2dpi.yaml.
* Call syscon_node_to_regmap() to get regmaps from LDB bridge helper driver
  and PXL2DPI bridger driver instead of syscon_regmap_lookup_by_phandle().
* Drop two macros from pixel link bridge driver which help define functions
  and define them directly.
* Properly disable all pixel link controls to POR value by calling
  imx8qxp_pixel_link_disable_all_controls() from
  imx8qxp_pixel_link_bridge_probe().
* Add Rob's R-b tags on patch 4/14 and 6/14.

v1->v2:
* Rebase the series upon the latest drm-misc-next branch(5.11-rc2 based).
* Use graph schema in the dt-bindings of the bridges. (Laurent)
* Require all four pixel link output ports in fsl,imx8qxp-pixel-link.yaml.
  (Laurent)
* Side note i.MX8qm/qxp LDB official name 'pixel mapper' in fsl,imx8qxp-ldb.yaml.
  (Laurent)
* Mention pixel link is accessed via SCU firmware in fsl,imx8qxp-pixel-link.yaml.
  (Rob)
* Use enum instead of oneOf + const for the reg property of pixel combiner
  channels in fsl,imx8qxp-pixel-combiner.yaml. (Rob)
* Rewrite the function to find the next bridge in pixel link bridge driver
  by properly using OF APIs and dropping unnecessary DT validation. (Rob)
* Drop unnecessary port availability check in i.MX8qxp pixel link to DPI
  bridge driver.
* Drop unnecessary DT validation from i.MX8qxp LDB bridge driver.
* Use of_graph_get_endpoint_by_regs() and of_graph_get_remote_endpoint() to
  get the input remote endpoint in imx8qxp_ldb_set_di_id() of i.MX8qxp LDB
  bridge driver.
* Avoid using companion_port OF node after putting it in
  imx8qxp_ldb_parse_dt_companion() of i.MX8qxp LDB bridge driver.
* Drop unnecessary check for maximum available LDB channels from
  i.MX8qm LDB bridge driver.
* Mention i.MX8qm/qxp LDB official name 'pixel mapper' in i.MX8qm/qxp LDB
  bridge drivers and Kconfig help messages.

Liu Ying (14):
  media: uapi: Add some RGB bus formats for i.MX8qm/qxp pixel combiner
  media: docs: Add some RGB bus formats for i.MX8qm/qxp pixel combiner
  dt-bindings: display: bridge: Add i.MX8qm/qxp pixel combiner binding
  drm/bridge: imx: Add i.MX8qm/qxp pixel combiner support
  dt-bindings: display: bridge: Add i.MX8qm/qxp display pixel link
    binding
  drm/bridge: imx: Add i.MX8qm/qxp display pixel link support
  dt-bindings: mfd: Add i.MX8qm/qxp Control and Status Registers module
    binding
  dt-bindings: display: bridge: Add i.MX8qxp pixel link to DPI binding
  drm/bridge: imx: Add i.MX8qxp pixel link to DPI support
  drm/bridge: imx: Add LDB driver helper support
  dt-bindings: display: bridge: Add i.MX8qm/qxp LVDS display bridge
    binding
  drm/bridge: imx: Add LDB support for i.MX8qxp
  drm/bridge: imx: Add LDB support for i.MX8qm
  MAINTAINERS: add maintainer for DRM bridge drivers for i.MX SoCs

 .../bindings/display/bridge/fsl,imx8qxp-ldb.yaml   | 173 +++++
 .../display/bridge/fsl,imx8qxp-pixel-combiner.yaml | 144 ++++
 .../display/bridge/fsl,imx8qxp-pixel-link.yaml     | 106 +++
 .../display/bridge/fsl,imx8qxp-pxl2dpi.yaml        | 108 +++
 .../devicetree/bindings/mfd/fsl,imx8qxp-csr.yaml   | 192 ++++++
 .../userspace-api/media/v4l/subdev-formats.rst     | 156 +++++
 MAINTAINERS                                        |  10 +
 drivers/gpu/drm/bridge/Kconfig                     |   2 +
 drivers/gpu/drm/bridge/Makefile                    |   1 +
 drivers/gpu/drm/bridge/imx/Kconfig                 |  42 ++
 drivers/gpu/drm/bridge/imx/Makefile                |   9 +
 drivers/gpu/drm/bridge/imx/imx-ldb-helper.c        | 232 +++++++
 drivers/gpu/drm/bridge/imx/imx-ldb-helper.h        |  98 +++
 drivers/gpu/drm/bridge/imx/imx8qm-ldb-drv.c        | 587 +++++++++++++++++
 drivers/gpu/drm/bridge/imx/imx8qxp-ldb-drv.c       | 722 +++++++++++++++++++++
 .../gpu/drm/bridge/imx/imx8qxp-pixel-combiner.c    | 448 +++++++++++++
 drivers/gpu/drm/bridge/imx/imx8qxp-pixel-link.c    | 429 ++++++++++++
 drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c       | 487 ++++++++++++++
 include/uapi/linux/media-bus-format.h              |   6 +-
 19 files changed, 3951 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-ldb.yaml
 create mode 100644 Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-pixel-combiner.yaml
 create mode 100644 Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-pixel-link.yaml
 create mode 100644 Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-pxl2dpi.yaml
 create mode 100644 Documentation/devicetree/bindings/mfd/fsl,imx8qxp-csr.yaml
 create mode 100644 drivers/gpu/drm/bridge/imx/Kconfig
 create mode 100644 drivers/gpu/drm/bridge/imx/Makefile
 create mode 100644 drivers/gpu/drm/bridge/imx/imx-ldb-helper.c
 create mode 100644 drivers/gpu/drm/bridge/imx/imx-ldb-helper.h
 create mode 100644 drivers/gpu/drm/bridge/imx/imx8qm-ldb-drv.c
 create mode 100644 drivers/gpu/drm/bridge/imx/imx8qxp-ldb-drv.c
 create mode 100644 drivers/gpu/drm/bridge/imx/imx8qxp-pixel-combiner.c
 create mode 100644 drivers/gpu/drm/bridge/imx/imx8qxp-pixel-link.c
 create mode 100644 drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c

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2.7.4