[PATCH v4 0/9] drm/bridge: Kconfig: cleanup DRM_PANEL usage

[Luca Ceresoli <luca.ceresoli@bootlin.com>]

As a cleanup in preparation for making every drm_panel embed a drm_bridge,
fix missing or unnecessary usage of DRM_PANEL and DRM_PANEL_BRIDGE in
drivers/gpu/drm/bridge/Kconfig.

== Grand plan

This is part of the work to support hotplug of DRM bridges. The grand plan
was discussed in [0].

Here's the work breakdown (➜ marks the current series):

 1. ➜ add refcounting to DRM bridges struct drm_bridge,
      based on devm_drm_bridge_alloc()
    A. ✔ add new alloc API and refcounting (v6.16)
    B. ✔ convert all bridge drivers to new API (v6.17)
    C. ✔ kunit tests (v6.17)
    D. ✔ add get/put to drm_bridge_add/remove() + attach/detach()
         and warn on old allocation pattern (v6.17)
    E. ➜ add get/put on drm_bridge accessors
       1. ✔ drm_bridge_chain_get_first_bridge(), add cleanup action (v6.18)
       2. ✔ drm_bridge_get_prev_bridge() (v6.18)
       3. ✔ drm_bridge_get_next_bridge() (v6.19)
       4. ✔ drm_for_each_bridge_in_chain() (v6.19)
       5. ✔ drm_bridge_connector_init (v6.19)
       6. ✔ protect encoder bridge chain with a mutex (v7.2)
       7. ✔ of_drm_find_bridge
          a. ✔ add of_drm_get_bridge() (v7.0),
               convert basic direct users (v7.0-v7.1)
          b. ✔ convert direct of_drm_get_bridge() users, part 2 (v7.0)
          c. ✔ convert direct of_drm_get_bridge() users, part 3 (v7.0)
          d. ✔ convert direct of_drm_get_bridge() users, part 4 (v7.1-v7.2)
          e. ✔ bridge-only drm_of_find_panel_or_bridge() users (v7.2)
       8. ➜ panel_bridge lifetime
          a. ➜ cleanup DRM_PANEL in bridge drivers
	  b. … embed a drm_bridge in every drm_panel
       9. ✔ enforce drm_bridge_add before drm_bridge_attach (v6.19)
    F. ✔ debugfs improvements
       1. ✔ add top-level 'bridges' file (v6.16)
       2. ✔ show refcount and list lingering bridges (v6.19)
 2. ✔ handle gracefully atomic updates during bridge removal
    A. ✔ Add drm_bridge_enter/exit() to protect device resources (v7.0)
    B. ✔ Add drm_bridge_clear_and_put() (v7.1)
 3. … DSI host-device driver interaction
 4. ✔ removing the need for the "always-disconnected" connector
 5. ✔ Migrate i.MX LCDIF driver to bridge-connector (v7.2)
 6. … DRM bridge hotplug
    A. … Bridge hotplug management in the DRM core
       1. ✔ bridge-connector: attach encoder to the connector (v7.2)
       2. … drm bridge hotplug
    B.   Device tree description

[0] https://lore.kernel.org/lkml/20250206-hotplug-drm-bridge-v6-0-9d6f2c9c3058@bootlin.com/#t

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
Changes in v4:
- Removed 4 patches now upstream
- Fixed commit message of the tc358767 patch
- Link to v3: https://patch.msgid.link/20260831-drm-bridge-drm_panel-cleanup-v3-0-50efd8168b3e@bootlin.com

Changes in v3:
- Fixed a few patches which incorrectly removed 'select DRM_BRIDGE'
- Added missing 'select DRM_PANEL_BRIDGE' to some patches where
  devm_drm_of_get_bridge() is used (thanks Doug)
- Added patch 13 for tc358764
- Removed boucing address spanda@codeaurora.org from Cc list
- Link to v2: https://patch.msgid.link/20260825-drm-bridge-drm_panel-cleanup-v2-0-c6c88ba7ffd2@bootlin.com

Changes in v2:
- Added maintainers and recent authors to per-patch Cc list (these are not
  added automatically by get-maintainers because the patches touch only the
  Kconfig file)
- Added review trailer
- No changes to commit messages and patch content
- Link to v1: https://patch.msgid.link/20260812-drm-bridge-drm_panel-cleanup-v1-0-0d86734e908a@bootlin.com

---
Luca Ceresoli (9):
      drm/bridge: tc358764: don't select unused DRM_PANEL
      drm/bridge: ti-dlpc3433: don't depend on DRM_PANEL, select DRM_PANEL_BRIDGE
      drm/bridge: nxp-ptn3460: select DRM_PANEL_BRIDGE, not DRM_PANEL
      drm/bridge: parade-ps8622: select DRM_PANEL_BRIDGE, not DRM_PANEL
      drm/bridge: tc358775: select DRM_PANEL_BRIDGE, not DRM_PANEL
      drm/bridge: tc358767: select DRM_PANEL_BRIDGE
      drm/bridge: tc358768: select DRM_PANEL_BRIDGE
      drm/bridge: ssd2825: select DRM_PANEL_BRIDGE
      drm/bridge: tc358764: select DRM_PANEL_BRIDGE

 drivers/gpu/drm/bridge/Kconfig | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)
---
base-commit: 2d70e1401dbbfc559b6a5d1ba8275d5282d71c2c
change-id: 20260812-drm-bridge-drm_panel-cleanup-09ed5cc10948

Best regards,
--  
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com